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Rozprawy doktorskie na temat „Novel superconductors”

Autor: Grafiati

Data publikacji: 5 czerwca 2025

Data aktualizacji: 1 sierpnia 2025

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1

Desoky, Waled Mohamed Ahmed. "Vortex imaging in novel superconductors." Thesis, University of Bath, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604642.

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High resolution scanning Hall probe microscopy and Hall magnetometry have been used to investigate the magnetic properties of single crystal samples of Co-doped 8r-122 and Ba-122 iron- based superconductors and high quality MgB2 thin films. We have made a quantitative analysis of the evolution of the profiles of well-isolated vortices as a function of temperature, and used a fitting procedure to extract the temperature-dependent magnetic field penetration depth, ACT). This, in turn, allowed us to infer the temperature-dependent superfluid density which has been compared with a-model results fo

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2

McLennan, Alec. "Synthesis and characterisation of novel superconductors." Thesis, University of Liverpool, 2013. http://livrepository.liverpool.ac.uk/14395/.

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This work presents and discusses the recent advances in high temperature superconductors. It focuses on how both the superconducting fullerides and iron selenides have contributed to the state-of-the-art of high temperature superconductors. The discovery of the relationship between the critical temperature and the proximity of the Cs3C60 material to the Mott metal-insulator transition has clearly demonstrated unconventional superconductivity in fullerides. However, the best samples of Cs3C60 were synthesised in purities of ~80 % which complicates the analysis of the physical properties of this

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3

Lorscher, Christopher. "Novel properties of ferromagnetic p-wave superconductors." Doctoral diss., University of Central Florida, 2014. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6310.

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This thesis investigates the many extraordinary physical properties of the candidate p-wave ferromagnetic superconductors UCoGe and URhGe, and proposes theoretical predictions for p-wave superconductors yet to be discovered. In particular, we carry out angular dependent quantum field theoretical calculations of the thermodynamic H - T phase diagram known as the upper critical field, or more appropriately for ferromagnetic superconductors the upper critical induction, for various p-wave superconducting order parameter symmetries including: The axial Anderson-Brinkman-Morel(ABM) state, the chira

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4

Chanda, Geoffrey. "Terahertz and infrared spectroscopy of novel superconductors." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-157061.

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The present thesis is devoted to the investigation of novel superconductors by phase-sensitive terahertz transmission and infrared to ultraviolet spectroscopy. In particular, a nominally undoped Pr2CuO4 superconducting thin film, an FeTe0.5Se0.5 thin film, and a LiFeAs single crystal have been investigated. The emphasis is on the low-frequency part of the optical spectrum (i.e., the terahertz and infrared spectrum), as the goal of the study was to shed light on the size and symmetry of the superconducting gaps and also to determine the temperature dependences as well as the absolute values of

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5

Bounds, Richard. "Nuclear magnetic resonance of novel type-II superconductors." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/401112/.

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Nuclear magnetic resonance was crucial in the vindication of the theory of supercon-ductivity in 1957, it still continues to provide vital information today in the ongoing challenge that is the determination of the mechanism for type-II superconductors. This forms the basis of this piece of work, which details the preparation, charac-terisation and cryogenic measurements of two new superconductors based on the cage like fullerides. In light of recent synthetic developments it has now become possible to encapsulate small molecules inside the fullerene cage, which may then be doped with alkali m

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6

Manzano, Francisco. "Penetration depth study of high temperature and other novel superconductors." Thesis, University of Bristol, 2002. http://hdl.handle.net/1983/ba00b6a1-747c-4336-825b-79245a834e91.

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7

Mohler, Gregory. "Novel behavior of magnetic flux lines in type II superconductors /." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486398528557348.

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8

Fisher, Harry. "First-principles investigation of electron-phonon interactions in novel superconductors." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:1f2fee8c-28fa-4d2f-998f-ec6abf81de3e.

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Despite over 100 years of scientific research, a full understanding of superconductivity remains elusive. While it is known that the electron-phonon interaction is responsible for the formation of Cooper pairs in conventional superconductors, many superconductors exhibit behaviour suggestive of more exotic pairing mechanisms. In this thesis, two novel superconducting materials are considered, monolayer transition metal dichalcogenide, MoS<sub>2</sub>, and iron-based superconductor, LaFeAsO<sub>1−x</sub>F<sub>x</sub>. The former is ideal for the study of the electron-phonon interaction, as it n

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9

Li, Pengcheng. "Novel transport properties of electron-doped superconductors Pr₂₋xCexCuO₄₋[subscript delta]." College Park, Md. : University of Maryland, 2007. http://hdl.handle.net/1903/7278.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2007.<br>Thesis research directed by: Physics. Title from t.p. of PDF. X in title is subscript. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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10

Xin, Yan. "Transmission electron microscopy study of novel semiconductor heterostructures and high Tc superconductors." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313899.

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11

Zarzuela, Fernández Ricardo. "Novel quantum phenomena and excitation modes in type-I superconductors and magnetic vortices." Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/285263.

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The aim of this thesis was to study quantum phenomena and excitation modes in type-I superconductors and magnetic vortices. The intermediate state in type-I superconductors is characterized by the gradual penetration of magnetic flux and the coexistence of normal and superconducting domains. This thermodynamic phase shows a magnetic irreversibility of topological origin, even in the case of defect-free samples. This irreversibility has been explored in disk-shaped samples made of lead (the prototype of a type-I superconductor) using a magnetic field applied perpendicularly to the disk plan

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12

Bittner, Nikolaj [Verfasser]. "Novel Non–Equilibrium Dynamics in Superconductors: Induced Superconductivity and Higgs Modes / Nikolaj Bittner." Berlin : Freie Universität Berlin, 2017. http://d-nb.info/1126504831/34.

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13

Huang, Xinyi. "Novel Physical Phenomena of Iron-Based Superconductors Revealed Through Transport and Thermodynamic Measurements." Kent State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=kent1491943156716437.

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14

Ammar, Kirmani A. "NOVEL PHYSICAL PHENOMENA IN CORRELATED SUPERFLUIDS AND SUPERCONDUCTORS IN- AND OUT-OF-EQUILIBRIUM." Kent State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=kent1586785964148996.

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15

Chanda, Geoffrey [Verfasser], Joachim [Akademischer Betreuer] Wosnitza, and Martin [Akademischer Betreuer] Dressel. "Terahertz and infrared spectroscopy of novel superconductors / Geoffrey Chanda. Gutachter: Joachim Wosnitza ; Martin Dressel." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://d-nb.info/1069091847/34.

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16

Foronda, Francesca. "Muon spin spectroscopy and high magnetic field studies of novel superconductors and magnetic materials." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:55c7ed6b-af31-4b7b-8b64-217dcc6846ac.

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This thesis investigates a number of novel magnetic materials and high temperature superconductors using high-field magnetometry and muon spin spectroscopy (μSR). The main measurement techniques are briefly described and a study of the dimer material [Cu(pyrazine)(glycine)]ClO<sub>4</sub> is presented to demonstrate the use of the proximity detector oscillator as a susceptometer in high magnetic fields. μSR is a highly effective tool for probing magnetic order, spin freezing and spin dynamics. However, in some circumstances its performance may be impaired by the extent to which it pertur

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17

Angst, N. Manuel. "Studies of magnetic properties of novel superconductors by means of SQUID and torque magnetometry." [S.l. : s.n.], 2003. http://e-collection.ethbib.ethz.ch/ecol-pool/diss/fulltext/eth14887.pdf.

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18

Mohammed, Hussen Ali. "Development of nanoscale sensors for scanning Hall probe microscopy and investigations of novel vortex phases in highly anisotropic superconductors." Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667736.

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Bismuth Hall effect sensors with active sizes in the range 0.1µm - 2µm have been fabricated by electron beam lithography and lift-off techniques for applications in scanning Hall probe microscopy (SHPM). The key figures of merit of the sensors have been systematically characterised as a function of device size. The miniumum detectable field of 100nm probes at room temperature is found to be Bmin=0.9mT/Hz0.5, with scope for more than a factor of ten reduction by using higher Hall probe currents. This is significantly lower than in similar samples fabricated by focussed ion beam (FIB) milling of

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19

Vakaliuk, Oleksii [Verfasser], Thomas [Akademischer Betreuer] Fröhlich, Tetsuo Gutachter] Oka, and Bernd [Gutachter] [Halbedel. "Novel Lorentz Force Velocimetry system based on bulk high-temperature superconductors / Oleksii Vakaliuk ; Gutachter: Tetsuo Oka, Bernd Halbedel ; Betreuer: Thomas Fröhlich." Ilmenau : TU Ilmenau, 2020. http://d-nb.info/1211604187/34.

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20

Grosse, Corinna. "Structural and electrical characterization of novel layered intergrowth compounds." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17432.

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Die untersuchten Ferekristalle sind neuartige Verwachsungs-Schichtverbindungen aus m Monolagen von Niobdiselenid (NbSe2), die wiederholt mit n atomaren Bilagen von Bleiselenid (PbSe) oder Zinnselenid (SnSe) geschichtet sind. Niobdiselenid als Volumenmaterial besitzt eine Schichtstruktur und ist ein Supraleiter. Aufgrund ihrer gezielt einstellbaren atomar geschichteten Struktur können Ferekristalle als Modellsysteme für geschichtete Supraleiter dienen. In dieser Arbeit werden ihre strukturellen und elektrischen Eigenschaften untersucht. Mittels Transmissionselektronenmikroskopie wird ihre tur

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21

Romanovsky, Igor Alexandrovich. "Novel properties of interacting particles in small low-dimensional systems." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-07102006-041659/.

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Thesis (Ph. D.)--Physics, Georgia Institute of Technology, 2007.<br>Landman, Uzi, Committee Member ; Yannouleas, Constantine, Committee Member ; Bunimovich, Leonid, Committee Member ; Chou, Mei-Yin, Committee Member ; Pustilnik, Michael, Committee Member.

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22

Buling, Anna. "Electronic Structure Investigation of Novel Superconductors." Doctoral thesis, 2014. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2014081412717.

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The discovery of superconductivity in iron-based pnictides in 2008 gave rise to a high advance in the research of high-temperature superconductors. But up to now there is no generally admitted theory of the non-BCS mechanism of these superconductors. The electron and hole doped Ba122 (BaFe2As2) compounds investigated in this thesis are supposed to be suitable model systems for studying the electronic behavior in order to shed light on the superconducting mechanisms. The 3d-transiton metal doped Ba122 compounds are investigated using the X-ray photoelectron spectroscopy (XPS), X-ray absorption

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23

HU, HAN-HONG, and 胡衍宏. "A study on the novel synthesis and characterization of high-Tc bismuth-based superconductors and some superconducter/polymer composites." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/70531330952406545327.

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24

Shang-YuWang and 王上瑜. "Growth of Large Single Grain Y-Ba-Cu-O Bulk Superconductors with Novel Thin Film Seed Technique." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/80843472073394498470.

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碩士<br>國立成功大學<br>材料科學及工程學系碩博士班<br>100<br>Epitaxial thin film seed has higher crystalline than bulk seed and it can improve the quality of crystal growth. The crystal orientation can also controlled by thin film seed., and it will use in multi-seed technique. By multi-seeding, the crystal growth area can extended several times. The single crystal growth with NdBCO thin film seeds is discussed in this study including multi-seed technique. The factor likes operation temperature window, the cooling rate during nucleation, the seed setting distance, and the seed setting orientation should be concer

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25

Pereg-Barnea, Tamar. "Zero field ESR of magnetic impurities in superconductors : a novel technique for measuring magnetic penetration depth and application to high Tc YBa2Cu3O7-[delta]." Thesis, 2001. http://hdl.handle.net/2429/11792.

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The Meissner effect in superconductors is characterized by an exponential decay of externally applied magnetic fields into the sample with a length scale A, that is called the magnetic penetration depth. λ is directly related to the superfluid density of the superconductor and is therefore one of the most important probes of the intrinsic properties of superconductors. This work describes the development of a new technique for measuring the penetration depth at microwave frequencies and low temperatures. The surprising combination of two seemingly unrelated experiments has led to a dire

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26

Patterson, Donald Eugene. "Studies involving novel inorganic materials: I. The direct fluorination of diamond, high-temperature superconductors, and selected organic materials. II. The use of gem-cut cubic zirconia in the diamond anvil cell." Thesis, 1989. http://hdl.handle.net/1911/16279.

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The direct reaction of elemental fluorine with diamonds, YBa$\sb2$Cu$\sb3$O$\sb{\rm 7-x}$, and some unique organic materials has been studied. It has been found that diamonds (powder, slabs, and CVD films) can be directly fluorinated to a small extent using elemental fluorine under various reaction conditions. The reaction appears to proceed by fluorine attacking the diamond's more labile surface features such as the hydroxyl group. While the diamond surface is reactive to some extent, it is difficult to fully fluorinate this surface with elemental fluorine. Plasma fluorination seems to lead t

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27

Ho, Ping-Long, and 何秉隆. "Superconducting Properties of Novel Superconducters (Mg1-xAlx)B2." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/64360718387589772730.

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碩士<br>國立中山大學<br>物理學系研究所<br>90<br>Abstract In the light of the tremendous progress that has been made in raising the transition temperature of the copper oxide superconductors. At present, the highest reported values of Tc for non-copper-oxide bulk superconductivity are 33 K in CsxRbyC60, and 30 K in Ba1-xKxBiO3. The recent discovery of superconductivity at 39 K in the sample binary ceramic compound magnesium diboride, MgB2(ref. 1), was therefore surprising. Indeed, this material has been known and structurally characterized since the mid 1950s, and is readily available from chemical supplier

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