Дисертації з теми "Niobium superconductor"
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Parvaneh, Hamed. "Growth and characterisation of niobium/gadolinium superconductor-ferromagnet nanocomposites." Thesis, University of Cambridge, 2006. https://www.repository.cam.ac.uk/handle/1810/183639.
Повний текст джерелаMagnée, Petrus Hubertus Cornelis. "Mesoscopic transport in superconductor - semiconductor structures." [S.l. : [Groningen] : s.n.] ; [University Library Groningen] [Host], 1996. http://irs.ub.rug.nl/ppn/14856769X.
Повний текст джерелаLudlam, James Leslie. "Superconducting joints with rectangular cross section niobium-tin multifilamentary superconductor." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13269.
Повний текст джерелаHiggs, Thomas David Charles. "Magnetic structures and proximity effects in rare-earth/transition metal ferromagnetic and superconductor systems." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/280118.
Повний текст джерелаBacks, Alexander [Verfasser], Peter [Akademischer Betreuer] Böni, Peter [Gutachter] Böni, and Blackburn [Gutachter] Elizabeth. "Vortex Matter of the Intertype Superconductor Niobium Studied by Neutron Imaging, Neutron Diffraction and Molecular Dynamics Simulations / Alexander Backs ; Gutachter: Peter Böni, Blackburn Elizabeth ; Betreuer: Peter Böni." München : Universitätsbibliothek der TU München, 2021. http://d-nb.info/1235664724/34.
Повний текст джерелаBhatiya, Shobhit. "A15 stoichiometry and grain morphology in rod-in-tube and tube type Nb3SN strands; Influence of strand design, heat treatments and ternary additions." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1268231937.
Повний текст джерелаSaxey, David W. "A high-resolution superconducting pressure gauge and irreversible magnetic effects in Nb and NbTi wires." University of Western Australia. School of Physics, 2005. http://theses.library.uwa.edu.au/adt-WU2005.0007.
Повний текст джерелаOliveira, Tarciso Mesquita de. "Picos da magnetização em supercondutores do tipo II." [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278497.
Повний текст джерелаDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataglin
Made available in DSpace on 2018-09-24T18:20:24Z (GMT). No. of bitstreams: 1 Oliveira_TarcisoMesquitade_M.pdf: 3236428 bytes, checksum: f8799c6f4d4ac1a196ca499b0ad67efb (MD5) Previous issue date: 2005
Resumo: Nesta tese estudamos possíveis origens do Segundo Pico da Magnetização (SPM) em supercondutores de alta e baixa temperatura crítica, usando amostras monocristalinas de Bi2Sr2CaCu2O8+d e de Nb. Para estudar o SPM fizemos medidas de curvas de magnetização M x H e suscetibilidade AC (vs. h e T). Através da aplicação de uma lei de escala, para suscetibilidade AC, obtivemos o expoente de creep na região do SMP. Em amostras de Nb verificamos os efeitos sobre as curvas M x H de não homogeneidades na amostra: deslocamentos de planos e oxigênio intersticial. Em amostras de alta pureza (bulk e monocristalina) observamos que as curvas M x H não apresentam o SPM nem o Efeito Pico, próximo a Hc2.Ao adicionar não homogeneidades nas amostras, através de dopagem com oxigênio e deformação por elongação, observamos o aparecimento do Efeito Pico, de instabilidades termomagnéticas e de anisotropia do campo Hc2. Em amostras de Bi2Sr2CaCu2O8+d observamos que o SPM está associado com a componente do campo aplicado paralela à direção c da rede cristalina, ou seja, que o SPM está relacionado com vórtices de Abrikosov e que vórtices Josephson parecem não influenciar no SPM. Ao clivarmos a amostra observamos que a intensidade do SPM se reduz e diminui a janela de temperatura onde ele é visto. Obtivemos o expoente de creep e observamos que na região do SPM o arrasto dos vórtices diminui em campos que antecedem o HSPM , mas na região de HSPM o arrasto aumenta rapidamente e depois volta a cessar. Interpretamos a variação brusca no expoente de creep como uma mudança de fase no sistema de vórtices, que passa de um estado de quase-rede para um estado emaranhado de vórtices
Abstract: In this thesis we have studied possible origins for the Second Magnetization Peak (SMP) in high and low critical temperature superconductors, using samples of Bi2Sr2CaCu2O8+d and Nb single crystals. To study the SMP we did measurements of magnetization curves (M x H) and AC susceptibility (vs. h and T). We obtained the creep exponent in the SMP region, using a scaling law for the AC susceptibility data. In the Nb samples we have verified the effects on M x H curves due to inhomogeneities like dislocations and interstitial oxygen. In high pure samples (bulk and single crystals) we have observed that the M x H curves do not present either SMP or Peak Effect, near H2c . By adding inhomogeneities in the samples, like doping them with oxygen or deforming by elongation, we have observed the appearance of Peak Effect, thermomagnetic instabilities, and H2c anisotropy. In Bi2Sr2CaCu2O8+d samples we have observed that the SMP is associated with the magnetic field component parallel to the crystal c direction of crystal net. This means that the SMP is related to Abrikosov¿s vortices and that Josephson¿s vortices seem not to influence the SMP. After cleaving the sample we observed that the SMP intensity was reduced and the temperature window were it occurs was decreased. We have obtained the creep exponent and have observed that in the SMP region the vortices creep diminish for fields below HSPM , but around HSPM the creep increases abruptly and after the SPM it decreases again. We have interpreted the abrupt creep exponent variation as a phase transition in the vortex system, that pass from a quasi-lattice state to an entangled vortex state
Mestrado
Física
Mestre em Física
Dai, Zhenting. "Coherent and Dissipative Transport in Metallic Atomic-Size Contacts." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/19880.
Повний текст джерелаKeys, Simon Alastair. "Temperature and strain scaling laws for the critical current density in Nb(_3)Sn and Nb(_3)Al conductors in high magnetic fields." Thesis, Durham University, 2001. http://etheses.dur.ac.uk/3951/.
Повний текст джерелаMoshopoulou, Evangélia. "Les systèmes Li(1-x)Ti2O4 et Li(1-x)NbO2 : relations entre stoechiométrie, structure et supraconductivité." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10020.
Повний текст джерелаGottlieb, Ulrich. "Quelques propriétés physiques intrinsèques des siliciures métalliques et semiconducteurs." Grenoble INPG, 1994. http://www.theses.fr/1994INPG0008.
Повний текст джерелаLin, Kun Ching, and 林昆憬. "Electrical Measurement of Niobium/Graphene Superconductor Vertical Tunneling Junctions." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/62574809571979250008.
Повний текст джерела國立清華大學
物理系
104
We implement a tunable vertical graphene-superconductor tunnel junction and aim to investigate the tunneling behaviors between Dirac fermions and Cooper pairs. Our device consists with two serial coupled Niobium (Nb)-Graphene junctions, which are coated with an ionic gel as a top-gate electrode for controlling the Fermi-level (EF) of grapheme at room temperature. When EF is tuned away from the charge-neutral point (CNP or called the Dirac point) of grapheme and the temperature is lower to the critical temperature of Nb (~ 9 K), we observe a clear dip structure of differential conductance in the vicinity of zero-bias source-drain voltage (VSD), and peak features as VSD approaches the superconducting gap, which indicate clear behaviors of a superconducting Nb-graphene junction. The general features aforementioned evolve with EF ; intriguingly the differential conductance becomes fluctuating as EF is tuned closed CNP. Our data analysis suggests the observed tunneling behaviors are consistent with the theoretical predictions based on the approaches of Bogoliubov-de-Genn equation when EF is away from CNP. Near CNP, the tunneling behaviors are dominated by the combinations of the effects of interfacial disorders and specular Andreev reflection.
Syu, Ya-Fong, and 許雅峯. "A study of electric properties of graphene/niobium superconductor junction." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/12590358132654232648.
Повний текст джерела國立清華大學
物理系
104
We investigate the electric properties through graphene-Nb superconductor junction and aim to study Andreev reflection (AR) as a function of Fermi-level EF of graphene. The Nb thin film is deposited on quartz with superconducting temperature Tc close to 9 K. The graphene is prepared by chemical vapor deposition (CVD) and transfer on top of Nb-pattern, in which two series coupled junctions are defined. In particular, we carefully treat Nb surface so to ensure clean interface is achieved. To control EF of graphene, we employ ion-gel on graphene as a gate electrode. We first characterize the resistance of graphene with the gate voltage Vg, determine EF respected to the charge neutral point (CNP) and then cool down the sample below Tc,. We find as EF is tuned away CNP, the differential conductivity dI/dV v.s. V shows a suppressed dip structures, which width is comparable with the expected superconducting gap of Nb. Distinctly, as EF is in the vicinity of CNP, the downward feature of dI/dV becomes more pronounced. Data analysis suggest the retro-AR is enhanced near CNP due to smaller the critical angle of Andreev reflection. Our results provide the first comprehensive studies of electric properties of graphene-supercondutor interface and open a new route to further explore the tunneling processes of AR for Dirac fermions.
Sahu, Manas Ranjan. "Tuning Andreev reflection at Graphene - superconductor junction: from zero field to quantum Hall regime." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4998.
Повний текст джерелаPyon, Taeyoung. "Evaluation of copper to superconductor area ratio measurement techniques for niobium-titanium composite superconducting wire." Thesis, 1992. http://hdl.handle.net/1957/37420.
Повний текст джерелаGraduation date: 1993
Bacon, Paul Eric. "Searching for new niobium oxide based superconductors." Thesis, 1995. http://hdl.handle.net/1957/34659.
Повний текст джерелаLiu, He. "Mechanical properties of Nb-Ti composite superconducting wires." Thesis, 1991. http://hdl.handle.net/1957/37677.
Повний текст джерелаGraduation date: 1991