Relevant bibliographies by topics / Condensed matter physics|Materials science / Dissertations / Theses
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Dissertations / Theses on the topic 'Condensed matter physics|Materials science'

Author: Grafiati
Published: 9 July 2021
Last updated: 12 February 2022

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1

Skorobogatiy, Maksim 1974. "Numerical methods in condensed matter physics." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/82756.

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Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.<br>Includes bibliographical references (leaves 62-63).<br>by Maksim A. Skorobogatiy.<br>M.Eng.
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2

Liu, Qihan. "Mechanics and Physics of Soft Materials." Thesis, Harvard University, 2016. http://nrs.harvard.edu/urn-3:HUL.InstRepos:33493423.

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Materials where thermal energy is comparable to the interaction energy between molecules are called soft materials. Soft materials are everywhere in our life: food, rubber, polymer diaper, our own body, etc. The thermal fluctuation endows soft materials with fundamentally different behavior comparing to hard materials like metals and ceramics. This dissertation studies three aspects of the mechanics and physics of soft materials, as is reviewed below. First, soft materials are generally swellable and viscous. The combination of diffusion and viscous flow gives rise to a length scale we called
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3

Kelleher, Colm P. "Phase behavior of charged hydrophobic colloids on flat and spherical surfaces." Thesis, New York University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10195879.

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<p> For a broad class of two-dimensional (2D) materials, the transition from isotropic fluid to crystalline solid is described by the theory of melting due to Kosterlitz, Thouless, Halperin, Nelson and Young (KTHNY). According to this theory, long-range order is achieved via elimination of the topological defects which proliferate in the fluid phase. However, many natural and man-made 2D systems posses spatial curvature and/or non-trivial topology, which require the presence of topological defects, even at T=0. In principle, the presence of these defects could profoundly affect the phase beha
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4

Mafi, Mariyeh. "Magnetic Characteristics of the Manganese-/Iron-Phthalocyanine Interface." Thesis, California State University, Long Beach, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10639509.

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<p> The magnetic properties of Metallo-organic heterostructure interfaces are studied. These heterostructures are built with manganese phthalocyanine (MnPc) and iron phthalocyanine (FePc). Previously, the powder of each material is reported to be an Ising-like chain magnet with Arrhenius relaxation. The relaxation is slow enough to exhibit magnetic hysteresis at low temperatures. Each layer of the heterostructure is investigated separately by depositing a thin film of either iron phthalocyanine (FePc) or manganese phthalocyanine (MnPc) on a Silicon substrate heated to 150 &deg;C. FePc thin fil
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5

Shojaei, Borzoyeh. "Antimonide-Based Compound Semiconductors for Quantum Computing." Thesis, University of California, Santa Barbara, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10195560.

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<p> Quantum information science has made significant progress over the last several decades, but the eventual form a quantum computer will take has yet to be determined. Several physical systems have been shown to operate as quantum bits, or qubits, but each faces a central challenge: the qubit must be sufficiently isolated from its environment to maintain quantum coherence while simultaneously having sufficient coupling to the environment to allow quantum mechanical interactions for manipulation and measurement. An approach to achieve these conflicting requirements is to create qubits that ar
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6

Hirschberger, Maximilian Anton. "Quasiparticle Excitations with Berry Curvature in Insulating Magnets and Weyl Semimetals." Thesis, Princeton University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10286472.

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<p> The concept of the geometric Berry phase of the quantum mechanical wave function has led to a better theoretical understanding of natural phenomena in all fields of fundamental physics research. In condensed matter physics, the impact of this theoretical discovery has been particularly profound: The quantum Hall effect, the anomalous Hall effect, the quantum spin Hall effect, magnetic skyrmions, topological insulators, and topological semimetals are but a few subfields that have witnessed rapid developments over the three decades since Michael Berry's landmark paper. In this thesis, I will
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7

Li, Haoxiang. "Angle-Resolved Photoemission Spectroscopy Study of High Temperature Superconductor Cuprate, and Potential High Temperature Superconductors K-Doped p-Terphenyl and Trilayer Nickelate." Thesis, University of Colorado at Boulder, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10642070.

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<p>The macroscopic quantum phenomenology of superconductivity has attracted broad interest from both scientific research and applications. Many exotic physics found in the first high $T_C$ superconductor family cuprate remain unsolved even after 30 years of intense study. Angle-Resolved Photoemission Spectroscopy (ARPES) provides the direct probe to the major information of the electronic interactions, which plays the key role in these exotic physics including high $T_C$ superconductivity. ARPES is also the best tool to study the electronic structure in materials that potentially hold high $T_
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8

Kharal, Shankar Prasad. "Modelling Sensitization Dynamics in 5xxx Series Aluminum Alloys." Thesis, University of Louisiana at Lafayette, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10682751.

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<p> This thesis addresses the use of the Johnson-Mehl-Avrami-Kolmogorov (JMAK) model for better understanding of kinetics of crystallization of the beta-phase in sensitized aluminum alloys. Three acoustic parameters: longitudinal velocity, transverse velocity, and attenuation coefficient for longitudinal waves, are modeled as a function of time as the beta-phase volume fraction increases. The acoustic parameters were previously measured in the same laboratory with two ultrasonic techniques, Resonant Ultrasound Spectroscopy (RUS) and Pulse Echo (PE), on sensitized samples of Al5083-H116 and Al5
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9

Gilpin, Claire E. "Fabrication and Electronic Studies of PbSe Nanoparticle Superlattices." Thesis, University of California, Irvine, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10117111.

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<p> Current global energy usage is largely dependent on non-renewable resources such as fossil fuels. Research is expanding into alternative, renewable energy sources such as solar energy. Of specific focus is research into the use of metal chalcoginide semiconductor nanoparticles as a cost-efficient platform for future use in solar applications. These semiconductor nanoparticles have size-dependent electronic band gaps within the solar spectrum and can be deposited into thin films from colloidal solutions. To date, most electronic studies have focused on thin films with disordered morphologie
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10

Smidt, Tess Eleonora. "Toward the Systematic Design of Complex Materials from Structural Motifs." Thesis, University of California, Berkeley, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10817362.

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<p> With first-principles calculations based on density functional theory, we can predict with good accuracy the electronic ground state properties of a fixed arrangement of nuclei in a molecule or crystal. However, the potential of this formalism and approach is not fully utilized; most calculations are performed on experimentally determined structures and stoichiometric substitutions of those systems. This in part stems from the difficulty of systematically generating 3D geometries that are chemically valid under the complex interactions existing in materials. Designing materials is a bottle
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11

Sabouri-Ghomi, Mohsen. "Study of fracture and stress-induced morphological instabilities in polymeric materials." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=38092.

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We study the phenomena of fracture in polymers at the molecular and continuum level. At a molecular level, we study the failure of polymer/polymer interfaces. Our main focus is on a specific mode of failure known as chain pull-out fracture, which is common to weak adhesive junctions, and polymer blends and mixtures. In the case of the interface between incompatible polymers, reinforcement is achieved by adding a block copolymer to the interface. We introduce a microscopic model based on Brownian dynamics to investigate the effect of the polymerization index N, of the block connector chain, on
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12

Sabouri-Ghomi, Mohsen. "Enhancement of superconductivity in relaxed Fe-Zr metallic glasses." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22800.

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This thesis presents the effects of the irreversible structural relaxation on the superconducting transition temperature, T$ sb{ rm c},$ for $ rm Fe sb{x}Zr sb{100-x}$ metallic glasses in the range $20 le x le 33.$ Quality of all fourteen samples prepared by melt spinning technique were examined using X-ray diffractometry and differential scanning calorimetry. Magnetic susceptibility, upper critical field, and superconducting transition temperature were measured for as-made and relaxed Zr-rich compositions. The results showed an unusual increase in superconducting transition temperature upon t
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13

Gu, Tianqu. "The resolution function of triple-crystal X-ray diffractometer and its applications." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28453.

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Based on the dynamical theory of X-ray scattering, the resolution function of a triple-crystal X-ray diffractometer is studied with particular emphasis on high-resolution setups. A general form describing the intensity distribution of a Bragg peak in reciprocal space is derived. The dynamical streaks associated with a Bragg peak and the width of the resolution function under the Gaussian approximation are studied in detail. The theory of absolute integrated intensity measurement by means of a triple-crystal diffractometer is developed. X-ray diffraction with synchrotron sources and multi-refle
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14

Hui, Yu 1977. "Heterjunctions of small molecular weight organic semiconductors." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81540.

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Photodiodes made of small molecular weight organic semiconductors have been fabricated. The organic materials under investigation are p-type Copper phthalocyanine (CuPc) and n-type 3,4,9,10-perylenetetracarboxylic bisbenzimidazole (PTCBI). Current-voltage and capacitance-voltage measurements have been performed to evaluate the electrical properties of the organic photodiodes. Optical measurements including responsivity and temporal response have also been carried out. It has been found that device efficiency of the photodiodes is influenced by the thickness of organic layers as well as
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15

Oh, JaeHo. "Edge spectroscopy in cleaved edge overgrowth GaAsAlGaAs." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82302.

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We measure the electron density of a single Landau Level of a two-dimensional electron system (2DES) in a GaAs/AlGaAs heterostructure cleaved edge overgrown structure. Edge spectroscopy, which is a powerful technique to probe correlations in 2D systems, has been used. While the 2DEG shows typical fractional quantum Hall features from a many-particle behavior (Luttinger Liquid) at low tunneling voltages, to single particle characteristic at high voltages, which reflects the absence of a many-body state away from the Fermi level. At high enough voltages, the single particle characteristic
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16

Burke, Sarah A. "Buckminsterfullerene on KBr studied by high resolution NC-AFM : molecular nucleation and growth on an insulator." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81605.

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Non-contact atomic force microscopy (NC-AFM) has been applied to the prototypical molecule-insulator system C60 on KBr. Both contact and non-contact imaging modes were used to characterize the KBr(001) surface. C60 molecules were deposited on UHV-cleaved KBr(001) surfaces and imaged with NC-AFM. Surveys of the surface revealed an island growth mode with a tendency towards nucleation at step edges. A long diffusion length was also estimated (600-800nm) from survey images. Molecular resolution images were also obtained revealing a coincident epitaxy between the C60 molecules and the subst
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17

Mehrez, Hatem. "Theoretical study of nano structures and molecular electronic systems." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=38237.

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Research studies on systems with reduced size and dimensionality have attracted great attention for the past two decades. This is mainly driven by industrial development, which demands the fabrication of new, small, well-controlled devices as well as the desire to understand quantum effects which manifest in these small structures.<br>In this thesis we theoretically investigate quantum coherent transport properties of nano structures in the form of molecular electronic systems. Our approach is based on Landauer-Buttiker transport theory. However, the details of the method depend on the interac
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18

Girt, Erol. "Elemental site substitutions in R-Fe compounds." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0004/NQ44441.pdf.

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19

Aguenaou, Karim. "Modeling of solidification." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ36950.pdf.

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20

Cross, Graham. "Mechanics of nanometer scale indentation of a metal surface." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ64543.pdf.

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21

Lindmark, Eric Karl 1965. "Erbium-doped GaAs/AlGaAs quantum wells and normal mode coupling of semiconductor microcavities." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282329.

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This dissertation investigated two different types of semiconductor heterostructures grown by molecular beam epitaxy. The first were erbium-doped GaAs/AlGaAs quantum well structures with concentrations of Er in the range of 10¹⁷-2 x 10¹⁹ cm⁻³. Photoluminescence (PL) of Er³⁺ ions and Er-induced defects were studied at liquid helium and higher temperatures. A strong diffusion of erbium and interdiffusion of gallium and aluminum ions were observed at the boundary of the GaAs/AlGaAs quantum wells which led, at high erbium concentrations, to the degradation of the quantum wells and macroscopic (ave
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22

Dawley, Jeffrey Todd. "Phase development, microstructure, and ferroelectric properties of sol-gel derived strontium bismuth tantalate thin films." Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/284019.

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Ferroelectric materials have been studied extensively over the past decade or so as potential candidates for memory applications, since they possess a unique set of properties, including fast polarization switching and non-volatility. The two major candidate materials being studied for integration into ferroelectric random access memories (FeRAMs) are lead zirconate titanate (PZT) and strontium bismuth tantalate (SrBi₂Ta₂O₉ or SBT). Overall, PZT has probably been the most extensively studied of the two materials, however SBT has received a lot of attention over the past few years due to its fa
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23

Bentz, Daniel N. "The effects of surface roughness and stress on lattice gas models using kinetic Monte Carlo modeling." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/289920.

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This thesis reports kinetic Monte Carlo computer simulations using a lattice gas model conducted on a variety of systems. These studies may be divided into two main categories: rod eutectics and related surface roughening, and surface morphology changes due to local stresses. The first grouping is a study of irregular rod eutectic systems. Simulations of directional solidification of rod eutectic systems were conducted using a model similar to the spin one Ising model. Growth of the rods was initiated from columns of pure A atoms embedded in a matrix of B atoms. The growth characteristics of t
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24

Workman, Richard K. "Force microscopy of self-assembled amphiphilic films." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/289962.

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Scanning force microscopy is a powerful technique to study surfaces in vacuum, air or liquids because of its nanometer spatial resolution and piconewton force resolution. The work presented here uses colloidal (steric and double layer) forces to investigate the shape of surfactant micelles on an isotropic hydrophobic surface (Chapter 3). Frictional forces are used in this work as a useful contrast mechanism in the study of monolayer water films (Chapter 4), self-assembled monolayers (Chapter 6), and to detect the presence and concentration of a 2D gas phase of molecules on a surface (Chapter 5
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25

Vazquez, Isaura 1960. "On aluminum grain boundary structure and segregation." Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/291693.

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The effect of an alloying agent, such as Mg, on Al grain boundary microstructure and chemistry was investigated. HREM measurements on an Al-5% Mg Σ = 5 (310) grain boundary showed Al grain boundary structure modification because of the presence of Mg. Chemical analysis, through TEM/STEM EDS of Al-2% Mg alloy, indicated the possibility of Mg segregation at Al grain boundaries, although this should be further investigated. An experiment is proposed to determine the change in grain boundary torque with impurity chemical potential. Molecular dynamic simulations of the effect of segregated vacancie
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26

Litombe, Nicholas E. "Nanopatterning and Transport Properties of Cuprate Superconductors." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:17465318.

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Almost 30 years since the discovery of the copper oxide high temperature superconductors, the underlying mechanism describing their behavior continues to elude experimentalists and theorists alike. Understanding the electronic phases and various, possibly competing, orders at the nanoscale continues to be an active and hotly debated research enterprise. Tools available to probe nanoscale electronic behavior such as scanning tunneling microscopy have made tremendous strides in elucidating the nature of this high temperature superconductor ground state. Nevertheless, transport noise measurement
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27

Kodger, Thomas Edward. "Mechanical Failure in Colloidal Gels." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:14226100.

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When colloidal particles in a dispersion are made attractive, they aggregate into fractal clusters which grow to form a space-spanning network, or gel, even at low volume fractions. These gels are crucial to the rheological behavior of many personal care, food products and dispersion-based paints. The mechanical stability of these products relies on the stability of the colloidal gel network which acts as a scaffold to provide these products with desired mechanical properties and to prevent gravitational sedimentation of the dispersed components. Understanding the mechanical stability of such
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28

Wang, Pu. "Studies of quantum interference effects in iron-nickel-silicon-boron amorphous alloys." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26797.

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The purpose of this thesis is to study the temperature dependence of the electrical resistivity of the pseudo-binary (FexNi 1-x)77Si10B13 alloy system. The high precision four-wire electrical resistivity measuring method is used to obtain the resistance data of the samples from 2.1 K to 290 K. It is shown that the combination of quantum corrections, magnetic, and the thermal electron-phonon scattering contributions account for the temperature dependence of the electrical resistivity over the entire temperature range. The electron-electron interaction and the weak localization effects are domin
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29

Cadien, Adam. "The Structure and Dynamics of Monatomic Liquid Polymorphs; Case Studies in Cerium and Germanium." Thesis, George Mason University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3706976.

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<p> The study of liquid polymorphism is at the frontier of fundamental thermodynamics and materials science. Liquid polymorphism occurs when a single material has multiple structurally unique liquid phases. Water was the first substance suggested to exhibit multiple liquid phases, a number of monatomic semiconductors and metals have been found to exhibit similar characteristics since then. A better understanding of the liquid-liquid phase transition is needed to tackle problems in glass sciences, it is also relevant to geophysical studies of the Earth's core and mantle and has applications in
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30

Damewood, Liam James. "Theoretical Models of Spintronic Materials." Thesis, University of California, Davis, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3602035.

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<p> In the past three decades, spintronic devices have played an important technological role. Half-metallic alloys have drawn much attention due to their special properties and promised spintronic applications. This dissertation describes some theoretical techniques used in first-principal calculations of alloys that may be useful for spintronic device applications with an emphasis on half-metallic ferromagnets. I consider three types of simple spintronic materials using a wide range of theoretical techniques. They are (a) transition metal based half-Heusler alloys, like CrMnSb, where the ord
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31

Paulose, Jayson Joseph. "Cooperativity, Fluctuations and Inhomogeneities in Soft Matter." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:10854.

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This thesis presents four investigations into mechanical aspects of soft thin structures, focusing on the effects of stochastic and thermal fluctuations and of material inhomogeneities. First, we study the self-organization of arrays of high-aspect ratio elastic micropillars into highly regular patterns via capillary forces. We develop a model of capillary mediated clustering of the micropillars, characterize the model using computer simulations, and quantitatively compare it to experimental realizations of the self-organized patterns. The extent of spatial regularity of the patterns depends o
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32

Widjonarko, Nicodemus Edwin. "Physics of Nickel Oxide Hole Transport Layer for Organic Photovoltaics Application." Thesis, University of Colorado at Boulder, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3592397.

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<p> Organic photovoltaics (OPV) offers a potential for solar-electric power generation to be affordable. Crucial to OPV device performance is the incorporation of interlayers, ultra-thin films deposited between the photoactive material and the electrical contacts. These interlayers have various, targeted functionalities: optical window, encapsulation, or electronic bridge. The last category is known as "transport layers'', and is the focus of this thesis. </p><p> In this thesis, we explore and investigate the physics that leads to improvements in OPV device performance when a transport laye
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Amavisca, Edward D. 1965. "Electron(hole)-phonon interaction in YBCO high temperature superconductor using quantum path integral molecular dynamics." Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/277899.

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In this research, we have implemented an original technique to study the electronic properties of a single electron placed in YBa2 at 300K. Using a discretized extension of Feynman's Quantum Path Integral, we have been able to characterize effective electron-phonon interactions, and electron location site probability. We find that the electron stabilizes at oxygen vacant sites in the copper-oxygen chains. In the copper-oxygen planes, the electron is unstable and moves into the chain. Upon complementing the quantum electron to a positive charge thereby simulating a hole, we then find that the h
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34

Pechkis, Daniel Lawrence. "First-principles Calculations of Nuclear Magnetic Resonance Chemical Shielding Tensors in Complex Ferroelectric Perovskites." W&M ScholarWorks, 2011. https://scholarworks.wm.edu/etd/1539623590.

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Nuclear magnetic resonance (NMR) spectroscopy is one of the most important experimental probes of local atomistic structure, chemical ordering, and dynamics. Recently, NMR has increasingly been used to study complex ferroelectric perovskite alloys, where spectra can be difficult to interpret. First-principles calculations of NMR spectra can greatly assist in this task. In this work, oxygen, titanium, and niobium NMR chemical shielding tensors, s&d4; , were calculated with first-principles methods for ferroelectric transition metal prototypical ABO3 perovskites [SrTiO3, BaTiO 3, PbTiO3 and Pb
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Prakash, Arati Prakash. "Magneto Thermal Coupling in Solid State Transport." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1514502118670282.

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Buckingham, David Tracy Willis. "High-Resolution Thermal Expansion and Dielectric Relaxation Measurements on H2O and D2O Ice Ih." Thesis, Montana State University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10607201.

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<p> Ice Ih, formed by freezing liquid water below 273&sim;K at atmospheric pressure, is well-known and highly-studied, but some of its fundamental physical properties have mystified scientists since the early twentieth century. The thermal expansion is one of those properties; the low relative-resolution of past measurements has left questions regarding the structural isotropy and negative thermal expansion (NTE). Furthermore, the existence of relaxation phenomena near 100&sim;K, related to the residual entropy at 0&sim;K, may reveal itself through subtle features in the thermal expansion and,
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Iwagoshi, Joel A. "Thermal Vapor Deposition and Characterization of Polymer-Ceramic Nanoparticle Thin Films and Capacitors." Thesis, Northern Arizona University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1537781.

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<p>Research on alternative energies has become an area of increased interest due to economic and environmental concerns. Green energy sources, such as ocean, wind, and solar power, are subject to predictable and unpredictable generation intermittencies which cause instability in the electrical grid. This problem could be solved through the use of short term energy storage devices. </p><p> Capacitors made from composite polymer:nanoparticle thin films have been shown to be an economically viable option. Through thermal vapor deposition, we fabricated dielectric thin films composed of the poly
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38

Kremeyer, Kevin P. 1968. "Experimental and computational investigations of binary solidification." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/289267.

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The topic of this dissertation is the solidification of a binary melt. The investigation is separated into three portions: An experimental investigation on the NH₄Cl--H₂O system; the development of a Cellular Automata code; and the development of a pair of coupled partial differential equations governing the evolution of an array of dendrites. Any necessary concepts are reviewed in the introduction. The experimental investigation focuses on the morphological transition from "slow" <100> dendrites to "fast" <111> dendrites. It is shown how the very complicated structures occurring during the tr
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39

Herring, Patrick Kenichi. "Low Dimensional Carbon Electronics." Thesis, Harvard University, 2014. http://dissertations.umi.com/gsas.harvard:11475.

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This thesis covers several different experiments that comprised my graduate career. The main focus of these experiments was the use of carbon as an electronic material and a steady evolution of fabrication recipes that allowed us to perform reliable and consistent measurements. The second chapter describes experiments with carbon nanotubes, where our goal was to produce devices capable of manipulating electronic spin states in order create quantum bits or "qubits." The third chapter covers the development of fabrication recipes with the goal of creating qubits within Si-Ge nanowire, and the bo
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40

Skuza, Jonathan Ronald. "Thin Film and Chemical Ordering Effects on the Magnetic Anisotropy in Binary Alloys." W&M ScholarWorks, 2011. https://scholarworks.wm.edu/etd/1539623583.

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This dissertation presents various investigations into the structure-property correlations in highly anisotropic FePt and FePd thin films and nanostructures. These binary alloy thin films may exhibit long-range chemical ordering (e.g. L10), which induces a strong uniaxial magnetic anisotropy whose orientation is dependent on the ordering direction in the thin film. The chemical ordering, and hence the magnetic anisotropy, in these thin films can be controlled and tailored through sputter deposition and ion implantation conditions followed by subsequent processing. Two novel fabrication method
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41

Hoke, Harris Clarence Jr. "Nuclear magnetic resonance studies of amorphous nickel-zirconium hydrides." W&M ScholarWorks, 1991. https://scholarworks.wm.edu/etd/1539623803.

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This research deals with one aspect of the scientific field of hydrogen in metals. The study of hydrogen in metals is technologically important for many reasons, among them is the use of hydrogen in metals to store energy. Hydrogen related energy technology is particularly attractive because hydrogen can be extracted from water, our most abundant resource, and can be used without any pollution. Metal hydrides may one day be widely used for automotive propulsion in cars, in batteries, and many other energy conversion devices. Amorphous NiZr is particularly interesting for hydrogen storage becau
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Li, Minxu. "Models for water outgassing from metal surfaces." W&M ScholarWorks, 1994. https://scholarworks.wm.edu/etd/1539623859.

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In this study, the outgassing rate from an electropolished stainless steel surface following exposures to H{dollar}\sb2{dollar}O vapor under various conditions was measured. The results of the experiments showed that the outgassing rate is proportional to {dollar}p\sb0\sp{lcub}n{rcub}{dollar}, where {dollar}p\sb0{dollar} is the H{dollar}\sb2{dollar}O exposure pressure and n is about 0.25. The outgassing rate is not as strongly dependent on the system temperature as one would expect if the temperature is kept the same during exposure and pump-down. The outgassing rate is also a function of the
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43

Walton, Scott Gregory. "The role of adsorbed oxygen in secondary emission from metallic substrates." W&M ScholarWorks, 1998. https://scholarworks.wm.edu/etd/1539623943.

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Low energy, ion- and photon-induced secondary electron and anion emission from metallic substrates has been investigated as a function of adsorbate coverage. Sodium positive ions (Na+), with kinetic energies up to 500 eV, and photons, with energies up to 23 eV, are utilized to initiate secondary emission. The principal adsorbate is oxygen with coverages ranging from none to a few monolayers.;For ion-induced emission, the secondary electron and negative ion absolute and relative yields from 302 stainless steel and polycrystalline tungsten (W) have been measured as a function of both impact ener
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44

Gammon, W. Jason. "Chemical bonding in hard and elastic amorphous carbon-nitride films." W&M ScholarWorks, 2003. https://scholarworks.wm.edu/etd/1539623423.

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In this study, the chemical bonding in hard and elastic amorphous carbon nitride (a-CNx) films is investigated with x-ray photoelectron spectroscopy (XPS) and 15N, 13C, and 1H nuclear magnetic resonance (NMR) spectroscopy. The films were deposited by DC Magnetron sputtering in a pure nitrogen discharge on Si(001) substrates at 300--400??C. Nanoindentation measurements reveal an elastic modulus of ∼50 GPa and a hardness of ∼5 GPa, thus confirming our films are highly elastic but resist plastic deformation.;Our 13C NMR study demonstrates the absence of sp 3-bonded carbon in this material. Collec
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45

Roach, Wiliam Michael. "Superconducting Thin Films for SRF Cavity Applications: A Route to Higher Field Gradient Linacs." W&M ScholarWorks, 2014. https://scholarworks.wm.edu/etd/1539623638.

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Many linear accelerator (linac) applications rely on the use of superconducting radio frequency (SRF) cavities. In order to overcome the current field gradient limits imposed by the use of bulk niobium, a model involving the deposition of alternating superconducting-insulating-superconducting (SIS) thin films onto the interior surface of SRF cavities has been proposed. Since SRF performance is a surface phenomenon, the critical surface of these cavities is less than 1 micron thick, thus enabling the use of thin films. Before such approach can successfully be implemented fundamental studies cor
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46

Yang, Kaida. "Magneto-Optics and Magneto-Transport Studies on Thin Films for Sensor Applications." W&M ScholarWorks, 2014. https://scholarworks.wm.edu/etd/1539623368.

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Recent progress and interest have bought considerable effort to bear on the synthesis and opportunities of magnetic thin films in different fields. There are applications in many fields, including remote sensing, waveguide applications, hard drive applications, etc. at the College of William and Mary, we have focused on utilizing magnetic thin films in some of these applications and are deeply involved in the optimization process of the thin films.
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47

Quinlan, Ronald A. "The functionalization of carbon nanosheets." W&M ScholarWorks, 2009. https://scholarworks.wm.edu/etd/1539623539.

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Carbon nanosheets are a novel two-dimensional nanostructure made up of 2-20 graphene atomic planes oriented with their in-plane axis perpendicular to the growth substrate. Previous efforts in developing nanosheet technology have focused on the characterization of the system and their development as an electron source due to the high atomic enhancement factor (beta) and low turn on field. Further investigation of nanosheets as high surface area electrodes revealed poor wetting by polymeric material and extreme hydrophobic behavior.;Because nanosheet technology has promise as a high surface area
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48

Venhaus, Thomas Joseph. "Plasma source ion implantation of high voltage electrodes." W&M ScholarWorks, 2000. https://scholarworks.wm.edu/etd/1539623981.

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Field emission and breakdown characteristics of high voltage, large area electrodes determine the performance of many vacuum-based electron sources. A corroborative project with the Thomas Jefferson National Accelerator Facility involves studying the behavior of such electrodes after nitrogen ion implantation. A Plasma Source Ion Implantation (PSII) facility is designed and constructed at William and Mary, and used to treat stainless steel electrodes. PSII is a novel implantation technique developed at the University of Wisconsin-Madison. A workpiece is submerged in a quiescent plasma of the s
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49

Quayle, Paul Connolly. "Synthesis and Characterization of Zinc Tin Nitride: A Charge-Neutral Ordering Model for Wurtzite-based Heterovalent Ternary Compounds." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1449247500.

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50

Russell, David D. "Design, synthesis, crystal structure and magnetic properties of novel osmium-based B-site ordered double perovskites." Thesis, California State University, Long Beach, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10011271.

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<p>Transition metal oxides (TMOs) with face centered cubic arrangement of magnetic ions are composed of triangular sub-lattices. When antiferromagnetic (AFM) interactions of the same strengths between all three pathways in triangular settings are in place, spin constraints cannot be fulfilled simultaneously and the system undergoes geometric magnetic frustration (GMF). The purpose of the work presented in this thesis is to better understand the criteria for a system to undergo GMF. To achieve this, the novel B-site ordered double perovskites Ca2ScOsO6 and Ca2.2Mg0.8OsO6 were synthesized in
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