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Dissertations / Theses on the topic 'Superconductivity'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

Kouvaris, Christoforos N. "Gapless color superconductivity." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32308.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2005.<br>Includes bibliographical references (p. 155-164).<br>In this thesis, we propose and investigate the "Gapless Color-Flavor Locked" (gCFL) phase, a possible new phase of dense and cold quark matter. At high enough densities, quarks interact with each other and form pairs similarly to electrons in superconductors. This phenomenon in the case of quark matter is called Color Superconductivity. Color superconducting matter must be electrically and color neutral, because otherwise there are huge energy costs, due to th
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2

Heron, Dale Robert. "Mathematical models of superconductivity." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296893.

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3

Barclay, Luke. "Aspects of holographic superconductivity." Thesis, Durham University, 2012. http://etheses.dur.ac.uk/3376/.

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In this thesis we study two different aspects of holographic superconductivity. First we study fully backreacting Gauss-Bonnet (GB) holographic superconductors in 5 bulk spacetime dimensions. We explore the system’s dependence on the scalar mass for both positive and negative GB coupling, α. We find that when the mass approaches the Breitenlohner-Freedman (BF) bound and α→(L^2)/4 the effect of backreaction is to increase the critical temperature, Tc , of the system: the opposite of its effect in the rest of parameter space. We also find that reducing α below zero increases Tc and that the effe
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4

Ballestar, Ana. "Superconductivity at Graphite Interfaces." Doctoral thesis, Universitätsbibliothek Leipzig, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-141196.

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The existence of superconductivity in graphite has been under discussion since the 1960s when it was found in intercalated graphitic compounds, such as C8K, C8Rb and C8Cs. However, it was only about 40 years ago when the existence of superconductivity in pure graphite came up. In this work we directly investigate the interfaces highly oriented pyrolytic graphite (HOPG) has in its inner structure, since they play a major role in the electronic properties. The results obtained after studying the electrical transport provide clear evidence on granular superconductivity localized at the interfaces
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5

Ožana, Marek. "Mesoscopic superconductivity : quasiclassical approach." Doctoral thesis, Umeå universitet, Institutionen för fysik, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-91484.

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This Thesis is concerned with the quasiclassical theory of meso-scopic superconductivity. The aim of the Thesis is to introduce the boundary conditions for a quasiclassical Green’s function on partially transparent interfaces in mesoscopic superconducting structures and to analyze the range of applicability of the quasiclassical theory. The linear boundary conditions for Andreev amplitudes, factoring the quasiclassical Green’s function, are presented.  The quasiclassical theory on classical trajectories is reviewed and then generalized to include knots with paths intersections.  The main focus
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6

Chapman, S. J. "Macroscopic models of superconductivity." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303594.

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After giving a description of the basic physical phenomena to be modelled, we begin by formulating a sharp-interface free-boundary model for the destruction of superconductivity by an applied magnetic field, under isothermal and anisothermal conditions, which takes the form of a vectorial Stefan model similar to the classical scalar Stefan model of solid/liquid phase transitions and identical in certain two-dimensional situations. This model is found sometimes to have instabilities similar to those of the classical Stefan model. We then describe the Ginzburg-Landau theory of superconductivity,
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7

Poenicke, Andreas. "Unconventional Superconductivity near Inhomogeneities." [S.l. : s.n.], 2008. http://digbib.ubka.uni-karlsruhe.de/volltexte/1000007522.

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8

Plekhanov, Evgueni. "Hubbard U Enhanced Superconductivity." Doctoral thesis, SISSA, 2003. http://hdl.handle.net/20.500.11767/4266.

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We present a. study of the superconducting properties of models containing the Hubbard rnpulsion term. This strnng on-site repulsion is considered as a key ingTedient of the high tempera.turn superconductivity. Though the fact that for the normal, lovv temperature superconductors, rnpulsion destroys superconducting order, it is argued in the present thesis, that for the pairing of the d-·wave symmetry in the strongly correlated electronic systems its effect is to enhance and may be to cause superconductivity. Various methods such as Variational Monte Carlo, Gutzwiller Approximation, Ti
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9

Glawe, Henning [Verfasser]. "Descriptors of Superconductivity / Henning Glawe." Berlin : Freie Universität Berlin, 2018. http://d-nb.info/1188239961/34.

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10

El, Bana Mohammed Sobhy El Sayed. "Superconductivity in two-dimensional crystals." Thesis, University of Bath, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.589655.

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Since the first isolation of graphene in 2004 interest in superconductivity and the superconducting proximity effect in monolayer or few-layer crystals has grown rapidly. This thesis describes studies of both the proximity effect in single and fewlayer graphene flakes, as well as the superconducting transition in few unit cell chalcogenide flakes. Optical and atomic force microscopy and Raman spectroscopy have been used to characterise the quality and number of molecular layers present in these flakes. Graphene structures with superconducting Al electrodes have been realised by micromechanical
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11

Raut, Dinesh V. "Aspects of superconductivity and fractionalization." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32423.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Physics, 2005.<br>Includes bibliographical references (p. 37).<br>Since their discovery in mid 80's, a complete theory of high temperature superconductors is yet to take its final shape. Theory of fractionalization attempts to explain the phenomenon by assuming that the electron is split into two particles, chargon and spinon, carrying charge and spin respectively. Although capable of producing the qualitative features of the phase diagram, this theory is not been able to account for a number of experimental observations. A simple
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12

Witt, James David Samuel. "Superconductivity and non-homogeneous magnetism." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610601.

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13

Scaffidi, Thomas. "Unconventional superconductivity in strontium ruthenate." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:af08bf3f-3934-48f1-89af-a897948172fb.

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In this thesis, a weak coupling formalism is developed to study superconductivity in spin-orbit coupled, multi-orbital systems. This formalism is then applied to Sr2RuO4, one of the few candidates for odd-parity superconductivity. We show that spin-orbit coupling and multi-band effects are crucial to understand the physics of this material. Depending on the interaction parameters, the order parameter can either be chiral or helical. In both cases, the gap is highly anisotropic, and has accidental deep minima along certain directions, in accordance with experiments. Focusing then on the chiral
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14

Kozii, Vladyslav. "Exotic superconductivity in quantum materials." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/127702.

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This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2019<br>Cataloged from the official PDF of thesis.<br>Includes bibliographical references (pages 345-342).<br>The theory of superconductivity developed by Bardeen, Cooper, and Schrieffer has proven to correctly describe a wide class of metals, where the effective attraction between electrons is mediated by phonons. Despite huge success, this theory fails to explain certa
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15

Luk, Kwok-hing R. "Quadrupolar impurity suppression of superconductivity /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487759914761644.

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16

Farrell, Aaron. "Topological superconductivity without proximity effect." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=119741.

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The search for a Majorana Fermion has been an area of intense interest in condensed matter research of late. This elusive particle, predicted to exist in 1937, has been sought after for both fundamental and practical reasons. On the fundamental level, no particle to date has been observed to be a Majorana fermion, meanwhile on the practical level a Majorana fermion, if found, would represent a non-abelian anyon and could thus be used to build a quantum computer. The search for a Majorana Fermion has recently shifted to topological superconductivity. Topological superconductors are categorized
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17

Yasui, Yuuki. "Superconductivity in Sr2RuO4 micro-rings." Kyoto University, 2019. http://hdl.handle.net/2433/242593.

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18

Martin, Marianne. "High-Temperature Superconductivity in Doped BaFe2As2." Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-126344.

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19

Zhou, Lubo. "Matrix field theory applications to superconductivity /." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/4136.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2006.<br>Thesis research directed by: Chemical Physics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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20

Brydon, Philip M. R. "Coexistence of superconductivity and excitonic ferromagnetism." View electronic text, 2002. http://eprints.anu.edu.au/documents/disk0/00/00/07/63/index.html.

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Thesis (BSc. (Hons))--Australian National University, 2002.<br>Available via the Australian National University Library Electronic Pre and Post Print Repository. Title from title screen (viewed Mar. 27, 2003). "A thesis submitted for the degree of Honours in theoretical physics at the Department of Physics and Theoretical Physics, The Faculty of Science, The Australian National University" "Honours thesis submitted November 2002" Includes bibliographical references.
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21

Yokoyama, Takehito, Seiichiro Onari, and Yukio Tanaka. "Enhanced triplet superconductivity in noncentrosymmetric systems." American Physical Society, 2007. http://hdl.handle.net/2237/11291.

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22

Peng, Yang [Verfasser]. "Signatures of topological superconductivity / Yang Peng." Berlin : Freie Universität Berlin, 2017. http://d-nb.info/1137867906/34.

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23

Shomar, Towfic Louis Elias. "Phenomenological realism, superconductivity and quantum mechanics." Thesis, London School of Economics and Political Science (University of London), 1998. http://etheses.lse.ac.uk/2602/.

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The central aim of this thesis is to present a new kind of realism that is driven not from the traditional realism/anti-realism debate but from the practice of physicists. The usual debate focuses on discussions about the truth of theories and how they relate with nature, while the real practices of the scientists are forgotten. The position I shall defend is called "phenomenological realism". The realist doctrine was recently undermined by the argument from pessimistic meta-induction, also known as the argument from scientific revolutions. I argue that phenomenological realism is a new kind o
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24

Macarie, Liliana Sandina. "Correlated electrons and high-temperature superconductivity." Thesis, University of Warwick, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307992.

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25

Kundu, Joydip 1977. "Two key questions about color superconductivity." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/29452.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2004.<br>Includes bibliographical references (p. 109-116).<br>We pose two key questions about color superconductivity: What are the effects of the large strange quark mass, and what are the observable consequences of color superconductivity? Motivated by the first question, we study crystalline color superconductivity. We adapt the Nambu-Gor'kov formalism to study this phase, and go on to examine distinctions between crystalline color superconductivity induced by quark mass differences and by quark chemical potential dif
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26

Imboden, Matthias. "Diamond nanoelectromechanical resonators: dissipation and superconductivity." Thesis, Boston University, 2012. https://hdl.handle.net/2144/31569.

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Thesis (Ph.D.)--Boston University<br>PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.<br>Nanoelectromechanical systems (NEMS) have become a viable commercial technology and are becoming more and more prevalent in research applications. Through miniaturization, the mechanical response to external
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27

Fehrenbacher, Roland. "Theoretical problems posed by high-temperature superconductivity /." Zürich, 1993. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10256.

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28

Eguchi, Gaku. "Non-centrosymmetric superconductivity in d-electron compounds." 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/175101.

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29

Pang, Brian SiewHan. "Control of superconductivity in cuprate/manganite heterostructures." Thesis, University of Cambridge, 2004. https://www.repository.cam.ac.uk/handle/1810/34610.

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Research has shown that the spin alignment in an adjacent ferromagnet is capable of suppressing superconductivity. In this project, devices incorporating cuprate/manganite heterostuctres were successfully fabricated to study the effects of spin transport on the high temperature superconductor, YBCO. Deposition of such oxide ferromagnet/superconductor (F/S) multilayers using the 'eclipse' pulsed laser deposition(PLD) technique was also examined. Reproducible multilayers with ultrathin repeats were deposited, which exhibited superconducting and magnetic properties to minimum thicknesses of 3nm f
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30

Kaveh-Maryan, Kamran. "Superconductivity near boundaries, a wave-function approach." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ60133.pdf.

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31

Agarwal, P. "Magnetism and superconductivity in heavy-fermion metals." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.595373.

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One of the key challenges of contemporary condensed matter physics is to understand how the large variety of states of matter arises in electron systems. While the basic force is in all cases the electrostatic Coulomb interaction, the variety of states of matter spans an impressively broad spectrum, ranging from insulators to superconductors, and including a variety of magnetic phases. In recent years, a series of new, emergent phenomena have added more exotic states to the list of known behaviour in metallic systems, and some of them defy the standard descriptions of 'normal' metals, known as
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32

Badr, Mohamed Hosiny. "TUNNELING STUDY OF SUPERCONDUCTIVITY IN MAGNESIUM DIBORIDE." UKnowledge, 2003. http://uknowledge.uky.edu/gradschool_diss/422.

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Although the pairing mechanism in MgB2 is thought to be phonon mediated, there are still many experimental results that lack appropriate explanation. For example, there is no consensus about the magnitude of the energy gap, its temperature dependence, and whether it has only one-gap or not. Many techniques have been used to investigate this, like Raman spectroscopy, farinfrared transmission, specific heat, high-resolution photoemission and tunneling. Most tunneling data on MgB2 are obtained from mechanical junctions. Measurements of energy gap by these junctions have many disadvantages like th
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33

Longmore, A. "Neutron scattering and praseodymium suppression of superconductivity." Thesis, University of Oxford, 1995. http://ora.ox.ac.uk/objects/uuid:46caa612-2ff0-40ae-8cdc-898a9bb9c639.

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PrBa<sub>2</sub>Cu<sub>3</sub>O<sub>6</sub><sub>+</sub><sub>x</sub> is anomalous among the compounds which can be made by substituting different rare-earth ions for yttrium (Y) in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>6</sub><sub>+</sub><sub>x</sub>:it is the only compound which has the same structure as YBa<sub>2</sub>Cu<sub>3</sub>O<sub>6</sub><sub>+</sub><sub>x</sub>, and yet does not superconduct. This unusual property makes it an important system to study, since the differences between the two compounds could produce theoretical insights into the mechanisms of cuprate, or high-temperature, s
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34

Cowan, Greig Alan. "Single-colour and single-flavour colour superconductivity." Thesis, University of Glasgow, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.412941.

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35

Wooldridge, Jennifer. "Superconductivity and magnetism in sodium cobaltate oxyhydrate." Thesis, University of Warwick, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.443624.

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36

Powell, Benjamin James. "On the interplay of superconductivity and magnetism." Thesis, University of Bristol, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251063.

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37

Liu, Ru-Shi. "The chemical control of high temperature superconductivity." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240144.

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38

McCulloch, Neil. "A search for superconductivity in conjugated polymers." Thesis, Heriot-Watt University, 2010. http://hdl.handle.net/10399/2324.

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The aim of this thesis is to search for a superconducting phase transition in a conjugated polymer with implanted magnetic atoms. To carry out this investigation we have performed a modified worldline quantum Monte Carlo (QMC) algorithm concentrating on the polymer cis-polyacetylene at finite temperatures. The Hamiltonian used is that of the extended Su-Schrieffer-Heeger discrete tight-binding electron-lattice model which incorporates on-site and nearest-neighbour electron-electron Hubbard terms, Brazovskii-Kirova symmetry breaking, and Kondo impurities. We have found that through changing the
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39

Saravanamuttu, Nagulan Sriharan. "Coexistence and competition of superconductivity and magnetism." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615972.

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40

Wu, Beilun. "Unconventional superconductivity in the ferromagnetic superconductor UCoGe." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAY010/document.

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Cette thèse discute essentiellement sur le champ critique supérieur du supraconducteur ferromagnétique UCoGe. La conductivité thermique et d'autres méthodes expérimentales ont été utilisées pour confirmer les nombreux comportements particuliers de Hc2 dans UCoGe, précédemment observés dans des études de résistivité. Ces caractéristiques, y compris une anisotropie forte et des courbures anormales, ne peuvent pas être interprétées en termes de théories classiques pour Hc2. Au lieu de cela, un phénomène spécifique aux supraconducteurs ferromagnétiques - la dépendance en champ de l'interaction d'a
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41

Daido, Akito. "Novel topological superconductivity and bulk-boundary correspondence." Kyoto University, 2020. http://hdl.handle.net/2433/253072.

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42

Uys, Hermann. "Non-extensive statistics and high temperature superconductivity /." Pretoria : [s.n.], 2001. http://upetd.up.ac.za/thesis/available/etd-11242005-135357/.

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43

Gomes, Niladri, and Niladri Gomes. "Superconductivity in Strongly Correlated Quarter Filled Systems." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/625678.

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The objective of this thesis is to reach theoretical understanding of the unusual relationship between charge-ordering and superconductivity in correlated-electron systems. The competition between these broken symmetries and magnetism in the cuprate high temperature superconductors has been extensively discussed, but exists also in many other correlated-electron superconductors, including quasi-two-dimensional organic charge-transfer solids. It has been suggested that the same attractive interaction is responsible for both charge-order and superconductivity. We propose that the specific intera
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44

Kittaka, Shunichiro. "Superconductivity of Sr2RuO4 and its eutectic systems." 京都大学 (Kyoto University), 2010. http://hdl.handle.net/2433/120634.

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45

Tada, Yasuhiro. "Theoretical Study on Superconductivity in Noncentrosymmetric Systems." 京都大学 (Kyoto University), 2011. http://hdl.handle.net/2433/142356.

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46

Muhammad, Hasnain Syed. "Transient High-Temperature Superconductivity in Palladium Hydride." Thesis, Griffith University, 2016. http://hdl.handle.net/10072/367614.

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Superconductivity in the palladium-hydrogen system has been studied experimentally by measuring the electrical resistivity. Loading a palladium sample to a stoichiometric ratio close to unity resulted in high-temperature superconductivity at ≈ 55 K for PdHx and ≈ 60 K for PdDx. To observe the superconductivity it was necessary to cool the sample quickly from 300 C and measure the resistivity while heating quickly. For this project an important driver was a series of publications reporting the occurrence of superconductivity near room temperature with hydrogen-to-palladium ratio reaching 1. Th
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47

Carlström, Johan. "Multicomponent superconductivity : Vortex matter and phase transitions." Doctoral thesis, KTH, Statistisk fysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-136279.

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The topic of this thesis is vortex-physics in multi component Ginzburg- Landau models. These models describe a newly discovered class of super- conductors with multiple superconducting gaps, and possess many properties that set them apart from single component models. The work presented here relies on large scale computer simulations using various numerical techniques, but also on some analytical methods. In Paper I, Type-1.5 Superconducting State from an Intrinsic Proximity Effect in Two-Band Superconductors, we show that in multiband supercon- ductors, even an extremely small interband proxi
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48

Whitley, William George. "Charge density waves and superconductivity in U6Fe." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/22031.

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U6Fe has the highest superconducting transition temperature TSC ~ 4 K out of all of the U-based compounds. Unusually, the Pauli limit (1:84TSC = 7:36 T) is less than the observed critical field for both the a and c axes in this tetragonal material. Neither Pauli or usual BCS orbital limit is apparently respected. In order to explain why superconductivity exceeds the Pauli limit, it must be considered that either the superconducting state is unaffected by paramagnetic effects, or there is a large amount of spin-orbit scattering. Superconductivity is in the dirty limit for typical samples of U6F
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49

Huang, Hua. "High Tc superconductors and the contact properties." Thesis, University of Oxford, 1992. http://ora.ox.ac.uk/objects/uuid:283bec01-d830-4ce2-bcf2-de0918dd0588.

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Methods of processing large grained textured superconductor have been successfully developed, based on a melt texturing process. Large grained textured superconductor with grain size over 10mm along the growth direction and Jc over 3600A/cm<sup>2</sup> (77K, 0.5 Tesla) has been produced in both one - zone and two - zone furnaces with good reproducibility. Two kinds of design of reactive metal contacts have been proposed and investigated, aiming to make low resistivity contacts with strong mechanical strength. Three possible reactive contact metals have been tested for contact making, and the m
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50

Öktem, Bülent Abukay Doğan. "High temperature superconducting YBa2Cu3O7 thin flims and bolometers/." [s.l.]: [s.n.], 2006. http://library.iyte.edu.tr/tezler/master/fizik/T000555.pdf.

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