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Dissertations / Theses on the topic 'Thin film superconductors'

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Published: 4 June 2021
Last updated: 6 February 2022

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1

Grief, Andrew. "Modelling of thin-film superconductors." Thesis, University of Oxford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432285.

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2

Guldeste, Ayhan. "Bismuth based thin film superconductors." Thesis, University of Oxford, 1994. http://ora.ox.ac.uk/objects/uuid:681efdc0-8cba-4b3d-83eb-e0021eea5135.

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This thesis describes investigations performed into the growth and characterisation of Bi-based (Bi2Sr2Can-1CunO2n + 4 + x, n=2, 3) ceramic superconducting material in the form of thin films, about 0.5μm thick, grown on single crystal MgO, LaAIO3 and SrTiO3 substrates by r.f. magnetron sputtering. The effect of oxygen content on the Pb doped Bi-2223 (n=3) phase was also studied by changing the cooling process and by annealing in different partial pressures of oxygen at ambient pressure. The films produced have been assessed by considering their initial composition where it is found that Bi/Sr ratios can be between 0.9c- zero of around 80K is achievable for (Ca + Sr)/Bi ratios between 1.4 and 1.65 while Tc- onset remains above 90K for Bi-2212 films. However, the best superconducting properties can be obtained for a (Ca + Sr)/Bi ratio which is quite close the nominal composition. The use of a heavily Pb doped target is an effective way of Pb doping Bi-2223 thin films. A Bi-content of 1.410,sup>4A/cm2 at 77K. The effect of the initial Pb content and annealing conditions on the formation of the Bi-2223 phase was investigated. It was found that high Pb content (0.92PbO4) formed below 835°C and its fraction increases with increasing sintering temperature up to 862°C, while the fraction of initial phases decreases. An annealing duration of 30 min. has provided highly oriented films with c-axis perpendicular to the substrate surface and sharp superconducting transition (<5K). Although Pb/Bi ratio is not critical in the range studied, when it is above 1.3 slow heating and cooling is necessary to prevent retention of excess Ca2PbO4 in the film after sintering. On LaAIO3 and SrTiO3 perovskite substrates, Tc is at least 5K lower than in the case of MgO. Nevertheless, LaAIO3 can provide good microstructure with a critical current density, of 5x104A/cm2 at 77K. The direction and the range of variation of Tc in Bi-2223 films with oxidising process can be related to both the film composition (especially Bi and Pb content) and initial oxygen content. The variation range of Tc with oxidising is controlled by the Pb content. However, the maximum variation is around 4K at ambient pressure. Radiation response measurements were carried out on films patterned into a 150μm wide, and 1 cm long meander-type structure using standard photolithography and wet chemical etching in EDTA. The results showed that the optical response using a continuous wave (cw) He-Ne laser is bolometric, while the microwave response using a 34.5 GHz Gunn diode microwave generator contains a non bolometric component. Such polycrystalline Bi-based high Tc thin films may have interesting applications as sensitive microwave detectors, but they are not particularly good for microwave applications because of their high surface resistance, Rs, at microwave frequencies.
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3

McDonald, Peter Hughes 1965. "High temperature superconductor thin film optical detectors." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277167.

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Since the recent discovery of a new class of high critical temperature superconductors (HTS), much interest has been shown in their potential use as optical detectors. The purpose of this research was to test thin film samples of the HTS Y1Ba2Cu3O7-delta as detectors and investigate any response to optical radiation. A laboratory test facility was designed and built for this purpose. The experimental results exhibit a variety of optical responses that are dependent upon the physical characteristics of each HTS thin film. Polycrystalline films exhibited a different detection mode than did epitaxial films. This research demonstrates that HTS thin films are viable optical detectors and have the potential to become competitive high-performance detectors as the new technology continues to emerge.
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4

Zahrir, A. "Thin film growth and characterization on high temperature superconductors." Thesis, University of Bristol, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335477.

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5

Kim, Kyongwan. "Mn12-acetate thin film patterns and their interaction with superconductors." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-2572.

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6

Tang, Guanghua. "High temperature thin film superconductors and microstrip spiral delay lines." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-01242009-063221/.

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7

Mingard, Kenneth Philip. "Stucture and properties of sputter deposited Y-Ba-Cu-O thin films." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.276884.

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8

Kumar, Dinesh. "Critical current and Lorentz force effects in superconducting thin films." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337985.

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9

Demirel, Ali Ihsan. "Preparation and characterization of YBCO thin film by using specific MOCVD growth technique." Thesis, University of Bristol, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294237.

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10

尤志一 and Chi-yat Ben Yau. "Fabrication of superconducting YBa2Cu3Oy thin film on YSZ substrates with or without a Eu2CuO4 buffer layer." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31225421.

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11

Yau, Chi-yat Ben. "Fabrication of superconducting YBa2Cu3Oy thin film on YSZ substrates with or without a Eu2CuO4 buffer layer." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22713402.

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12

Pohl, John E. T. "The electrical properties of bulk polycrystalline and thin film high temperature superconductors." Thesis, University of Nottingham, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315041.

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13

Naidoo, R. Y. "Growth and characterisation of thin film superconductors on oxides, silicon and silicides." Doctoral thesis, University of Cape Town, 1994. http://hdl.handle.net/11427/17519.

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High Tc thin film superconductors are of great interest because of their potential applications, particularly in the microelectronics field. A successful superconductor microelectronic technology depends both on the ability to grow good quality superconducting thin films, and the need to incorporate these films into multilayer semiconductor devices. In this work the growth and characterisation of high Tc Y₁Ba₂Cu₃O₇ films by inverted cylindrical magnetron sputtering and pulsed ruby laser ablation on oxides, silicon and silicides is investigated. The inverted cylindrical magnetron sputter system has been effectively used to counter the problem of negative ion re-sputtering found in sputter deposition of oxide films. The optimal growth conditions for both these techniques have been determined. Rutherford backscattering spectrometry is used to obtain thickness and stoichiometry information, while X-ray diffraction gave phase and orientational data. Ion channeling was used for structural analysis and Auger electron spectroscopy was used to determine the homogeneity of the films.
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14

Lin, Wen-Jih. "High-resolution X-ray scattering studies of thin film superconductors and semiconductors." Thesis, University of Edinburgh, 1998. http://hdl.handle.net/1842/12426.

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High-resolution x-ray scattering has attracted intensive attention for both fundamental research and industrial applications. Recently, the advance of synchrotron radiation sources has dramatically improved x-ray intensities, brightness and resolution, which has enhanced the ability of x-ray scattering studies. In spite of weak scattering cross-sections, high-brilliance x-ray sources have made the studies of surfaces and interfaces possible. In the last decade, many new x-ray techniques such as glancing-incidence-x-ray-reflectometry, crystal-truncation-rod analysis and reciprocal-space-mapping have been established and had great success in exploring the structure of various materials. This thesis starts with a review of high-resolution x-ray scattering which covers both the theoretical and the experimental backgrounds. Near perfect semiconducting thin films are examined to demonstrate the abilities of high-resolution x-ray scattering. Glancing incidence x-ray reflectometry was used to explore the interface morphology of a Si0.1Ge0.9 heterostructure grown with and without antimony acting as a surfactant. The results demonstrate that the film is smoother when grown with a sub-monolayer of the surfactant. Furthermore, due to the existence of the surfactant during growth, abnormal strong scattering was found from the long-range coherent conformal roughness. YBa2Cu3Ox thin film superconductors grown on various substrates from different growers were studied. Using high-resolution x-ray scattering techniques, the sample quality was measured using the position and the width of the Bragg reflections. By analysing the reciprocal space maps, the surface parallel lattice parameters were also determined. One of the best samples, the YBa2Cu3Ox grown on SrTiO3 by pulsed laser deposition was further studied. The results suggest that an ultra-high-quality crystal with thousands Ångstrom vertical and microns horizontal correlation is occupied nearly 95% of volume. However, due to the interface roughness, the scattering from this crystal can only be observed at low angle Bragg reflections and, therefore, is often ignored. Because this type of film is the best single crystal high-Tc superconductor, it will be the doorway to understanding high-Tc superconductivity.
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15

Burns, Brian Francis. "Characterisation of a magnetron discharge used in the production of thin film superconductors." Thesis, Queen's University Belfast, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317494.

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16

Han, Sang-Wook. "Spin-polarized neutron reflectivity and x-ray scattering studies on thin film superconductors /." free to MU campus, to others for purchase, 1999. http://wwwlib.umi.com/cr/mo/fullcit?p9962527.

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17

Ho, Man Tak Melanie. "Sol-gel derived strontium barium niobate films : structural, optical and electrical properties." HKBU Institutional Repository, 2005. http://repository.hkbu.edu.hk/etd_ra/636.

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18

Savoy, Steven Michael. "Molecular thin film/high temperature superconductor heterostructures : deposition, characterization and energy transfer /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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19

Buttner, Ulrich. "The development of equipment for the fabrication of thin film superconductor and nano structures." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6595.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2011.
ENGLISH ABSTRACT: The nano-age is more about the mesoscopic phenomena, than those occurring at molecular and atomic level, which have been studied by chemists and physicists for more than a hundred years. Nanotechnology is currently one of the most active fields being explored in many different disciplines by many scientists across the world. In this research field, it is imperative to continually create more effective and superior methods to build smaller and smaller electronic devices, circuits and sensors. Technology is being improved continually and, specifcally at our university, there was a need to improve our device manufacturing facility. The aim of this work was to create a new sputtering system, build a dry etching system and to make modifications to upgrade existing equipment. This work has been done to produce nano structures or devices and, most importantly, to save costs. New systems and equipment have been built to keep up with the progress in this field. In order to understand the significance of the different types of equipment used in the fabrication of thin film superconductor layers, an overview will be given of the complete process of manufacturing a patterned Josephson junction. The apparatus used will be described and critically analyzed, whereby the shortfalls in design will be highlighted and improvements shown. Some of the equipment, such as the plasma laser deposition system, the lithography system and the test facility existed before and has been modified. Newly designed systems were built to further improve the quality of our thin film superconductors; these include the inverted cylindrical magnetron (ICM) sputtering system, the argon ion mill and the incandescent substrate heater. Finally, the results of the improved thin films and structures will be shown. To summarize: The entire process was analyzed and upgraded, resulting in an improved device manufacturing facility.
AFRIKAANSE OPSOMMING: Die nano-era het aangebreek en nanotegnologie is tans een van die mees aktiewe en diverse navorsingsvelde wat wetenskaplikes wêreldwyd ontgin - hoofsaaklik as gevolg van nuwe verskynsels op molekulêre en atomiese vlak. In die nanotegnologie-navorsingsveld is die vereiste dat daar voortdurend meer effektiewe metodes gevind moet word om die al hoe meer miniatuurwordende elektroniese meganismes met verbeterde energieverbruik, spoed en ruimtebesparende vermoëns tot stand te bring. Dit is duidelik dat in hierdie toonaangewende navorsingsveld, waar tegnologiese ontwikkeling voorturend en snelgroeiend is, dit dikwels vinniger is om reeds bestaande toerusting aan te pas en te moderniseer ten einde in pas te bly met nuutontwikkelde en ontwikkelende tegnologieë. Die doel van die werk verrig, wat hier beskryf word, was om 'n nuwe deponeerstelsel, sowel as 'n droogets stelsel te bou. Bestaande apparaat is opgradeer deur verandering aan te bring. Die uiteintelikke doel is die vervaarding van beter nano-strukture, en terselfde tyd om kostes te bespaar. Nuwe stelsels en toerusting is gebou om tred te hou met tegnologiese vooruitgang. Om die belangrikheid van die verskillende tipes toerusting wat in die vervaardiging van dunlaag- supergeleierlae gebruik word te verstaan, sal 'n oorsig van die volledige vervaardigingsproses van 'n Josephson-patroon gegee word. Die apparaat wat gebruik is, sal beskryf en krities ontleed word en die tekorte in ontwerp sal uitgelig word, terwyl verbeterings aangetoon sal word. Sommige van die toerusting het voorheen bestaan en is aangepas, byvoorbeeld die plasmalaser-neerleggingstelsel, die litografiestelsel en die toetsfasiliteit. Nuwe ontwerpstelsels is gebou om die gehalte van ons dunlaagsupergeleiers verder te verbeter. Dit sluit die silindriese plasma deponeer stelsel, die Argon-ioon bron en die substraatverwarmer in. In hierdie tesis word daar eerstens 'n oorsig gegee van die totstandkomingsproses van 'n supergeleier kwantum-interfensiemeganisme, beginnende met dunlaagneerslag van YBCO (Yttrium, Barium en Koperoksied). Die oorsig word gevolg deur 'n stap-virstap beskrywing van elke daaropvolgende proses wat lei tot die voltooiing van die meganisme. Daarna word die toetsprosedure van die dunlaag en instrumente verduidelik. Bykomende veranderinge wat aan bestaande instrumente aangebring is (ten einde die dunfilmlae te verbeter en die toetsfasiliteit op te gradeer) word ook bespreek. Daar sal ook verwys word na artikels wat in verskeie joernale verskyn het oor die vernuwende aanpassings en sisteme wat in hierdie tesis verduidelik word. Ten slotte sal die resultate van die verbeterde dunlae en strukture getoon word. Kortom: die hele proses is ontleed en opgegradeer om 'n verbeterde apparaatvervaardigingsfasiliteit tot gevolg te hê.
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20

Bradley, Christopher Simon. "The synthesis and characterisation of Langmuir-Blodgett film forming TCNQ adducts." Thesis, Sheffield Hallam University, 1999. http://shura.shu.ac.uk/19388/.

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Substitution reactions of TCNQ (7,7,8,8-tetracyanoquinodimethane) with suitable electron donor moieties extended the range of gamma-bridged adducts R(4)Q3CNQ and R(4)P3CNQ of which the short chain Z-beta-(l-butyl-4'-quinolinium)-alpha-cyano-4-styryldicyanomethanide (C[4]H[9](4)Q3CNQ) is a typical example. These zwitterionic D-pi-A materials (where D and A are electron donors and acceptors respectively) exhibit properties such as solvatochromism, molecular rectification and second harmonic generation. Further synthetic work concentrated on modifying the donor, the acceptor and the substitution position within these zwitterions to create a series of diverse materials for non-linear optic research. Modification of the picolinium and quinolinium systems where the TCNQ substitution is in the alpha-position, has created the extensive analogous series-R(2)Q3CNQ and R(2)P3CNQ, their properties being compared and contrasted to the original gamma-bridged adducts. The behaviour of the materials on the subphase and their resultant Langmuir-Blodgett (LB) film fabrication was studied. The abrupt change in molecular orientation in LB films of the gamma-bridged adducts occurring at R= C[15]H[31] and above was not seen in the more flatly orientated alpha-bridged adducts. Further characterisation of the LB films was performed using reflectance-absorption infrared spectroscopy (RAIRS) and surface plasmon resonance (SPR).A number of N-alkylpyridinium benzimidazolate betaine derivatives and the related betaine-TCNQ adducts were prepared and their LB film forming properties were studied.
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21

Ichino, Yusuke, Yutaka Yoshida, Kouichi Inoue, Toshinori Ozaki, Yoshiaki Takai, Kaname Matsumoto, Masashi Mukaida, Ryusuke Kita, Ataru Ichinose, and Shigeru Horii. "Effect of BaZrO3 Addition and Film Growth on Superconducting Properties of (Nd,Eu,Gd)Ba2Cu3Oy Thin Films." IEEE, 2009. http://hdl.handle.net/2237/13894.

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22

Buckow, Alexander Ulrich [Verfasser], Lambert [Akademischer Betreuer] Alff, Wolfgang [Akademischer Betreuer] Donner, Wolfgang [Akademischer Betreuer] Ensinger, and Barbara [Akademischer Betreuer] Albert. "Thin film deposition of arsenic free pnictide superconductors / Alexander Ulrich Buckow. Betreuer: Lambert Alff ; Wolfgang Donner ; Wolfgang Ensinger ; Barbara Albert." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2015. http://d-nb.info/1111909938/34.

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23

Buckow, Alexander U. [Verfasser], Lambert [Akademischer Betreuer] Alff, Wolfgang [Akademischer Betreuer] Donner, Wolfgang [Akademischer Betreuer] Ensinger, and Barbara [Akademischer Betreuer] Albert. "Thin film deposition of arsenic free pnictide superconductors / Alexander Ulrich Buckow. Betreuer: Lambert Alff ; Wolfgang Donner ; Wolfgang Ensinger ; Barbara Albert." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2015. http://nbn-resolving.de/urn:nbn:de:tuda-tuprints-45742.

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24

Ayala, A. "Aspects of the SrO-CuO-TiO2 Ternary System Related to the Deposition of SrTiO3 and Copper-Doped SrTiO3 Thin-Film Buffer Layers." Washington, D.C : Oak Ridge, Tenn. : United States. Dept. of Energy ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2004. http://www.osti.gov/servlets/purl/836697-HiUEwz/native/.

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Thesis (Ph.D.); Submitted to the Univ. of New Mexico, Albuquerque, NM (US); 20 Dec 2004.
Published through the Information Bridge: DOE Scientific and Technical Information. "LA-14197-T" A. Ayala. 12/20/2004. Report is also available in paper and microfiche from NTIS.
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25

Jenkins, A. P. "Microwave applications of high temperature superconductors." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259904.

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26

Smyth, Catherine. "YBCO thin films by laser ablation." Thesis, Queen's University Belfast, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239224.

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27

Wallace, Roger James. "The optical properties of YBCO thin films." Thesis, Queen's University Belfast, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388097.

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28

Ulucan, Savaş Özyüzer Lütfi. "Growth of magnetron sputtered superconductor MgB2 thin films/." [s.l.]: [s.n.], 2006. http://library.iyte.edu.tr/tezlerengelli/master/fizik/T000550.pdf.

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29

Gao, Yuan. "Conversion of BaF₂ to BaO for in-situ growth of Y-Ba-Cu-O thin films." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/28987.

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The Y₁Ba₂Cu₃0x superconducting thin films were made by both sequential electron-beam evaporation and co-evaporation of Cu, BaF₂ and Y, followed with high temperature post-deposition annealing. The possibility of making Y₁Ba₂Cu₃0x superconducting film in situ with BaF₂ as the Ba source was investigated by studying the conditions of in situ conversion of BaF₂ to BaO. The BaO concentration in the film as function of the substrate temperature was estimated with an equilibrium thermodynamic model and found to agree with the experimental results. A brief experimental and theoretical exploration of BaCl₂ also showed that BaCl₂ does not have any advantage over BaF2 as the Ba source for in situ growth of Y-Ba-Cu-0 films from the growth temperature point of view.
Science, Faculty of
Physics and Astronomy, Department of
Graduate
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30

Tomlinson, Edward James. "The deposition and characterization of YBaCuO thin films." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239148.

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31

Long, Zhenyi. "Studies of two dimensional superconductor-normal metal hybrid thin films /." View online version; access limited to Brown University users, 2005. http://wwwlib.umi.com/dissertations/fullcit/3174641.

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32

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] and independently by Larkin and Ovchinikov [2] nearly 50 years ago. This coexistence has already been observed experimentally in both bulk samples [3, 4] and in thin films [5-7] which result from a different type of electron-pairing mechanism which electrons with spin pointing in the same direction team up to form Cooper pairs with one unit of spin, resulting in the so-called triplet superconductivity. Apart from this so-called ferromagnetsuperconductors which both superconducting and ferromagnetism order parameters are present in a uniform material, hybrid systems [8] are made form materials with different or even mutually exclusive properties. Therefore the overall property can be strongly affected by the interaction between constituent materials. The present work, concerns such a hybrid system where Nb, a superconducting metal having transition temperature below 9.5K, is placed in contact with a ferromagnetic metal, Gd with bulk Curie temperature of around 290 K in a form of a nanocomposite. The mutual immiscibility of these two elements gives us the opportunity to take advantage of both the superconduction and ferromagnetism properties of the constituents and further study the transport and magnetic behavior of the system and their effects on each other specially on the critical current of the superconductor which is expected to be modified by the proximity of the ferromagnetic metal.
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33

Cao, Jing. "Growth, characterization and measurement of epitaxial Sr2RuO4 thin films." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/274542.

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In this thesis, the growth of c-axis oriented Sr2RuO4 thin films using pulsed laser deposition and their electrical transport properties are systematically discussed. The deposition and optimization process involved several progressive steps. Specifically, the first focus was on the Sr2RuO4 phase optimization in films grown on lattice-matched (LaAlO3)0.3(SrAl0.5Ta0.5O3)0.7 (LSAT) substrates. Film composition was found to be greatly influenced by changes in oxygen pressure, substrate temperature, target to substrate distance, and laser fluence. High oxygen pressure, low substrate temperature, large target to substrate distance, and high laser fluence increased the tendency to form the Ru-rich SrRuO3 phase in the film. The second focus was on improving the electrical transport properties of Sr2RuO4 from metal-insulating to fully metallic and eventually to superconducting behavior. It was observed that the full width at half maximum (FWHM) of the Sr2RuO4 (006) rocking curves in x-ray diffraction (XRD) scan was related to the quality of the electrical transport response. By fine tuning the deposition parameters to obtain low FWHM values, the electrical transport behavior of the Sr2RuO4 thin films was consistently improved from metal-insulating to fully metallic. In addition, localized superconductivity with enhanced superconducting transition temperature Tc onset was also observed among the fully metallic film. An in-depth study of the XRD results in fully metallic films indicated the existence of defects (intergrowths) along the c-axis direction, which caused localized c-axis tensile strain. The existence of structural defects within the film was likely to be responsible for the fact that only localized superconductivity was observed in the films. Furthermore, the enhanced superconducting transition temperature (Tc) relative to bulk single crystals is likely to be associated to localized strain in the film. Finally, Nb doped SrTiO3 substrates were used to achieve better quality growth of partial superconducting Sr2RuO4 thin films. Sr2RuO4 films grown on Nb doped SrTiO3 substrates had smaller FWHM values and lower level of c-axis tensile strain compared to those on LSAT substrates. Various partially superconducting films with different thicknesses and different superconducting Tc values are presented, and correlations between fabrication process, film crystalline quality as well as transport properties are discussed. This work provides better understanding of the importance of maximizing crystalline quality by delicate fine tuning of PLD deposition parameters to achieve high quality superconducting films.
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34

Pullan, Penelope Anne. "Flux pinning in yttrium barium copper oxide superconducting thin films." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320038.

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35

Cornils, Lasse [Verfasser]. "STM investigations of superconductor hybrid systems: magnetic adatoms and chains on superconductors to thin superconducting films on topological insulators / Lasse Cornils." München : Verlag Dr. Hut, 2019. http://d-nb.info/1181514576/34.

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36

Al-Ameer, A. S. "Some studies of the properties of high Tc superconductors and their use as bolometers at low temperatures in measurements of the sound velocity in '4He gas." Thesis, University of Kent, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.232895.

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37

Wan, Yuk Ming. "High temperature superconducting YBa2 Cu3Ox thin films- device processing and transport measurements." Thesis, University of Nottingham, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357214.

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38

Wells, Andrea Dawn. "Deposition, surface chemistry, and electrochemistry of YBa₂Cu₃O₇₋(subscript delta) materials." Access restricted to users with UT Austin EID, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3036611.

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39

Bania, William Roger 1964. "Spray pyrolysis processing of yttrium-barium-copper-oxide and bismuth-strontium-calcium-copper-oxide superconducting thin films." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277080.

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The purpose of this investigation was to explore the processing parameters involved in the production of thin film superconductors by spray pyrolysis processing (SPP). The present study is an attempt to optimize the many parameters in SPP. The specific parameters studied were substrate temperature, carrier gas flow rate, substrate materials, solution stoichiometry, spray rate, concentration, starting materials, and substrate to nozzle distance. The effect of these parameters on film stoichiometry and the anticipated superconducting behavior were investigated at some length. Films were routinely produced in a spray chamber designed as a part of this research. Films were analyzed by Rutherford Backscattering Spectroscopy, X-Ray Diffraction, Scanning Electron Microscopy, and Meissner effect measurements.
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York, Timothy Howard. "Pulsed laser deposition of electronic ceramics and analysis of the ablation plume." Thesis, University College London (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362729.

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41

Nam, John Preston J. S. "Twinning studies on YBCO thin films." *McMaster only, 2005.

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42

Guruswamy, Tejas. "Nonequilibrium behaviour and quasiparticle heating in thin film superconducting microwave resonators." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/277214.

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In this thesis I describe work on developing theoretical and numerical models of supercon- ducting thin-film microwave resonators. Superconducting resonators are used in a variety of applications, one of which is as kinetic inductance detectors (KIDs). KIDs are ultra-low noise, highly sensitive, multiplexable detectors, with uses in a wide variety of fields including astrophysics, medical imaging, and particle physics. Resonators are also crucial for supercon- ducting qubit readout, superconducting mixers and parametric amplifiers, and as multiplexers for other devices. The results described in this thesis apply to all thin film resonators, but are primarily described in the context of KIDs. I develop models of how constant absorbed power affects superconducting thin films, driving them out of thermal equilibrium with the bath. Using the Chang & Scalapino equations, I calculate numerically the steady-state quasiparticle and phonon distributions for various sources of power (sub-gap and above-gap photons and phonons, single frequency and broadband). Many new results emerge, a few of which are: the quasiparticle heating effects of microwave power, explaining the experimentally measured saturation of resonator performance; the frequency dependence of the quasiparticle generation efficiency in the sub-mm wavelength range; and the importance of phonon trapping in thin films at low temperatures. I then use these nonequilibrium results in higher-level device models. Starting from a generic framework for resonators, I present and implement a model of a KID with variable thermal isolation. I calculate the effects of quasiparticle heating on both the large-signal and small-signal behaviour, highlighting the effects of electrothermal feedback caused by readout power. Electrothermal feedback is shown to be able to increase or decrease the magnitude and bandwidth of the responsivity and noise, depending on the operating point. Finally, I propose an experimental measurement of quasiparticle heating effects in a new device – a four-port ring resonator. In such a device, unlike in the standard two-port resonator, the device can be heated and read out independently. I develop detailed models for the thermal and electrical behaviour of these devices, and suggest a scheme by which the quasiparticle heating effects of microwave power, predicted in this thesis, can be measured.
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Lea, Dallas Millard. "Integrated test structures for characterization of thin films for superconductor-insulator-superconductor devices and circuits /." Electronic copy available to NRAO users only, 1996. https://staff.nrao.edu/library/00000000033661.pdf.

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Steers, Stanley Frederick Magnus. "Evidence for a New State in Films of Underdoped Cuprate Superconductors." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492711572137518.

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45

Wong, Ho-yi Eric, and 黃灝頤. "Fabrication and characterization of epitaxial YBa2Cu3Oy thin films on double-buffered silicon substrates." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B2949073X.

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Bogorin, Daniela Florentina. "Superconducting Iridium Thin Films as Transition Edge Sensors." Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_dissertations/190.

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Transition edge sensors are the detectors of choice for a wide range of applications; from dark matter search, neutrino search, to cosmic radiation detection from near infrared to millimeter wavelengths. We are developing transition edge sensors using superconducting iridium thin films and we are proposing their use for future dark matter and neutrino search experiments. Our Ir films are deposited using an radio frequency (RF) magnetron sputtering and photolithographic techniques and measured using an adiabatic refrigerator capable of reaching temperatures of a few tens of mK. This thesis presents a detailed description of superconducting iridium thin films from the fabrication process to the characterization of the film properties at room temperature and low temperature. Alternative options for the bias circuit used to read out the TES signals will be discussed, we are proposing the use of RLC resonant circuits and transformers instead of SQUIDS.
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Li, Jinjin. "Studies of ultrafast processes in thin film high temperature superconductor and ferroelectric material." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/225.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2004.
Thesis research directed by: Electrical Engineering. 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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Scanderbeg, Daniel Joseph. "Thin film growth and characterization of the electron-doped superconductor Sm2̳-̳x̳Ce̳x̳CuO4̳-̳y̳." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3258702.

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Thesis (Ph. D.)--University of California, San Diego, 2007.
On t.p. "2̳-̳x̳". "e̳x̳", "4̳-̳y̳" are subscripts. Title from first page of PDF file (viewed June, 2007). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 96-101).
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McCrone, James Edward. "Physical properties and thin-film growth of the magnetic superconductor RuSr₂GdCu₂O₈." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621052.

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50

O'Brien, David F. "Annealing study of YBa2Cu3Ox thin films deposited by chemical vapor deposition on ceramic fiber tows." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/8650.

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