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Dissertations / Theses on the topic 'Niobium superconductor'

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Published: 6 September 2023

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1

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.

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Superconductivity and ferromagnetism are two antagonistic physical phenomena which their coexistence in a uniform material can be resolved only under extraordinary conditions. The reason for that is the phonon-mediated attraction energy between electrons which results in the formation of the so-called Cooper pairs, is usually smaller that the exchange (Zeeman) interaction between electrons which tend to align the electron spins. However, non-zero total momentum Cooper pairs can be accomplished even in the presence of an exchange field as surprisingly! predicted first by Fulde and Ferrel [1] an
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2

Magnée, 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.

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3

Ludlam, 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.

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4

Higgs, 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.

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The antiferromagnetic coupling between a rare-earth (RE) and a tran- sition metal (TM) ferromagnet can be exploited to engineer normal state and superconducting functional devices. RE/TM ferromagnetic multi- layers were previously used as spin-mixers to generate spin-triplet su- percurrents. This was possible due to magnetic inhomogeneity present in the devices, however the precise nature of the inhomogeneity was not understood. Here we present a comprehensive study of the Ni/Gd/Ni system using a powerful element-specific measurement technique: x-ray magnetic circular dichroism. In order to an
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5

Backs, 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.

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6

Bhatiya, 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.

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7

Saxey, 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.

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A high resolution pressure gauge has been developed for use in thermodynamic measurements along the lambda line in liquid helium. The gauge was designed to operate at cryogenic temperatures and provide pressure measurements up to 30bar, with an accuracy of 3 × 10¯¹ºbar in a 1Hz bandwidth. Experiments reported here show the gauge to have met these specifications; at least for measurements close to zero pressure, at temperatures close to 4.5K. It is expected that operation at higher pressures, and at temperatures closer to the lambda transition, will result in similar or even improved performanc
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8

Oliveira, Tarciso Mesquita de. "Picos da magnetização em supercondutores do tipo II." [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278497.

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Orientador: Oscar Ferreira de Lima<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataglin<br>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<br>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 magnetizaç
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9

Dai, Zhenting. "Coherent and Dissipative Transport in Metallic Atomic-Size Contacts." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/19880.

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Thin-film niobium mechanically controlled break junctions and resistively shunted niobium mechanically-controlled break junctions were developed and successfully microfabricated. Using these devices, high-stability atomic size contacts were routinely produced and investigated both in the normal and superconducting states. Investigations of the two-level conductance fluctuations in the smallest contacts allowed the calculation of their specific atomic structure. Embedding resistive shunts close to the superconducting atomic-sized junctions affected the coherence of the electronic transport. Fin
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10

Keys, 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/.

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Detailed, accurate measurements of critical current density and resistivity to determine the upper critical field have been made on a technological NbsAl conductor in magnetic fields up to 15 T, temperatures from 4.2 K up to the critical temperature and in the strain range from -1.8% to 0.7%. The uncertainty in temperature above 4.2 K was equivalent to ± 100 mK with a stability during the measurements of < 5 mK up to a limiting current of 80 A and a typical noise level of 1 µ Vm(^-1).When B(_c2){T,ε) is defined at 5%pn, 50%pn or 95%/%pn, an empirical relation is found where and an approximate
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11

Moshopoulou, 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.

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Ce travail est consacre a l'etude des variations structurales et des proprietes physiques en fonction de x dans les systemes supraconducteurs li#1#-#xti#2o#4 et li#1#-#xnbo#2 (0x<1). Nous avons travaille entierement sur des monocristaux afin de pouvoir controler l'extraction chimique des quantites precises de li#+ et de favoriser une bonne homogeneite des echantillons. Nos resultats montrent que le depart de li#+ dans li#1#-#xti#2o#4, a temperature ambiante, produit, a partir de x. 15, un deplacement des cations de titane sur les sites octaedriques vides 16c de la structure spinelle. Nous avon
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12

Gottlieb, Ulrich. "Quelques propriétés physiques intrinsèques des siliciures métalliques et semiconducteurs." Grenoble INPG, 1994. http://www.theses.fr/1994INPG0008.

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Dans la premiere partie nous decrivons la mise au point d'une experience de mesures de transport a basses temperatures. Nous avons construit un dispositif experimental qui permet de piloter la rotation de l'echantillon a basse temperature sous fort champ magnetique a partir de l'exterieur du cryostat. La deuxieme partie de la these est consacree a l'etude systematique des siliciures isostructuraux et isoelectroniques vsi#2, nbsi#2 et tasi#2. Les echantillons sont monocristallins. Les trois composes sont metalliques et leur resistivite a haute temperature est anisotrope. Des mesures de magnetor
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13

Lin, Kun Ching, and 林昆憬. "Electrical Measurement of Niobium/Graphene Superconductor Vertical Tunneling Junctions." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/62574809571979250008.

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碩士<br>國立清華大學<br>物理系<br>104<br>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
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14

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.

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碩士<br>國立清華大學<br>物理系<br>104<br>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.
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15

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.

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Andreev reflection (AR) is the underlying phenomena that determines the quasiparticle dynamics at the junction of a superconductor with any non-superconducting material, which in turn determines the transport properties of the junction. The tunability of Fermi energy in the two-dimensional (2D) Dirac semimetal graphene by using an electrostatic gate opened up possibility to realize some new and intriguingly different kind of AR. All of my thesis work is on understanding different kind of AR at graphene – superconductor interfaces, either by conductance measurements or by combining this with sh
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16

Pyon, Taeyoung. "Evaluation of copper to superconductor area ratio measurement techniques for niobium-titanium composite superconducting wire." Thesis, 1992. http://hdl.handle.net/1957/37420.

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Measurement of the copper to superconductor ratio (Cu/SC) in composite superconducting wires is necessary for process control, quality assurance, and characterization of the final wire properties. A comparison has been made of three techniques for measuring the Cu/SC ratio on a set of commercial wires produced for the Superconducting SuperCollider (SSC) Laboratory. The simplest and most straightforward technique, chemical etching, was found to display the best reproducibility, while the electrical resistivity technique shows the most variation and sensitivity to measurement errors, as well as
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17

Bacon, Paul Eric. "Searching for new niobium oxide based superconductors." Thesis, 1995. http://hdl.handle.net/1957/34659.

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18

Liu, He. "Mechanical properties of Nb-Ti composite superconducting wires." Thesis, 1991. http://hdl.handle.net/1957/37677.

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Mechanical properties of Nb-Ti composite superconducting wires were tested at room temperature. The results were analysed using simple composite theory, the rule of mixtures. The objective is to predict the mechanical properties of Nb-Ti superconducting composite wires as a function of volume ratio and geometry of the components, the composite wire size and the effect of heat treatment at final drawing wire sizes. To understand the mechanical behaviors of the Nb-Ti composite, mechanical testing of the individual composite components, Nb-Ti filament and copper matrix, was performed, and the geo
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