Flux Pinning in Yttrium Barium Copper Oxide Coated Conductors PDF Download
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Author: Zhijun Chen
Publisher:
ISBN:
Category :
Languages : en
Pages : 186
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Book Description
Author: Zhijun Chen
Publisher:
ISBN:
Category :
Languages : en
Pages : 186
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Book Description
Author: Mariappan Parans Paranthaman
Publisher:
ISBN: 9781600216923
Category : Electric currents, Alternating
Languages : en
Pages : 0
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Book Description
Major advances have been made in the last 18 years in high-temperature superconductor (HTS) research and development, resulting in increased use of HTS materials in commercial and pre-commercial electric-power applications. This new and important book addresses the issues related to flux pinning, AC losses and thick YBCO film growth. Written by top most scientists in the world, it presents the current status and issues related to YBCO coated conductors and the need for further fundamental materials science work in YBCO coated conductor. This will be a useful handbook for years to come.
Author: Sang Il Kim
Publisher:
ISBN:
Category :
Languages : en
Pages : 200
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Book Description
Author: Robert Joseph Mensah
Publisher:
ISBN:
Category : Flux pinning
Languages : en
Pages : 212
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Author: David Bostonian Jan
Publisher:
ISBN:
Category : Ferromagnetic materials
Languages : en
Pages : 332
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Book Description
Author: Paul Seidel
Publisher: John Wiley & Sons
ISBN: 3527670661
Category : Technology & Engineering
Languages : en
Pages : 1336
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Book Description
This wide-ranging presentation of applied superconductivity, from fundamentals and materials right up to the details of many applications, is an essential reference for physicists and engineers in academic research as well as in industry. Readers looking for a comprehensive overview on basic effects related to superconductivity and superconducting materials will expand their knowledge and understanding of both low and high Tc superconductors with respect to their application. Technology, preparation and characterization are covered for bulk, single crystals, thins fi lms as well as electronic devices, wires and tapes. The main benefit of this work lies in its broad coverage of significant applications in magnets, power engineering, electronics, sensors and quantum metrology. The reader will find information on superconducting magnets for diverse applications like particle physics, fusion research, medicine, and biomagnetism as well as materials processing. SQUIDs and their usage in medicine or geophysics are thoroughly covered, as are superconducting radiation and particle detectors, aspects on superconductor digital electronics, leading readers to quantum computing and new devices.
Author: Stephen Anthony Lawrence Foulds
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: M. Parans Paranthaman
Publisher: John Wiley & Sons
ISBN: 1118407172
Category : Technology & Engineering
Languages : en
Pages : 102
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Book Description
This proceedings investigates the relationship between features at the atomic level including oxygen vacancies, stacking faults and site order/disorder, grain boundaries, film-substrate interactions, buffer-superconductor interactions, thermodynamic, transport, and other macroscopic properties. This proceedings will also cover fundamental material properties studies, new growth methods, device and materials integration research, and developments in designing and growing new materials, all involving epitaxial superconducting thin films.
Author: Li-Chun Liáng
Publisher: Nova Publishers
ISBN: 9781604560831
Category : Science
Languages : en
Pages : 248
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Book Description
Superconductivity is the ability of certain materials to conduct electrical current with no resistance and extremely low losses. High temperature superconductors, such as La2-xSrxCuOx (Tc=40K) and YBa2Cu3O7-x (Tc=90K), were discovered in 1987 and have been actively studied since. In spite of an intense world-wide research, a complete understanding of the copper oxide (cuprate) materials is still lacking. Many fundamental questions are unanswered, particularly the mechanism by which high-Tc superconductivity occurs. More broadly, the cuprates are in a class of solids with strong electron-electron interactions. An understanding of such 'strongly correlated' solids is perhaps the major unsolved problem of condensed matter physics with over ten thousand researchers working on this topic. High-Tc superconductors also have significant potential for applications in technologies ranging from electric power generation and transmission to digital electronics. This ability to carry large amounts of current can be applied to electric power devices such as motors and generators, and to electricity transmission in power lines. For example, superconductors can carry as much as 100 times the amount of electricity of ordinary copper or aluminium wires of the same size. This Publication presents new research on yttrium barium copper oxide superconductors, often abbreviated YBCO, which is a chemical compound with the formula YBa2Cu3O7. This material, a famous 'high-temperature superconductor', achieved prominence because it was the first material to superconduct above the boiling point of nitrogen. All materials developed before YBCO became superconducting only at temperatures near the boiling points of liquid helium or liquid hydrogen (Tb = 20.1 K). The significance of the discovery of YBCO is the breakthrough in the refrigerant used to cool the material to below the critical temperature.
![Flux Pinning Study of REBa2Cu3O7-[delta] Coated Conductors for High Field Magnet Applications PDF](https://books.google.com/books/content/images/frontcover/spMHngEACAAJ?fife=w80-h100)
Author: Aixia Xu
Publisher:
ISBN:
Category : Materials science
Languages : en
Pages :
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Book Description
ABSTRACT: REBa2Cu3O7-delta (REBCO, RE = rare earth) coated conductor (CC) holds great promise for high field magnet applications owing to its strong irreversibility field (Hirr), low electromagnetic anisotropy (gamma2), and high critical current density (Jc). The work of this thesis is tightly related to the development of the funded 32 T, all-superconducting magnet project at the ASC/NHMFL. My concern is thus for understanding the optimizing of the working parameters of REBCO CC at low temperatures T, and very high magnetic fields H, focusing on how to enhance Ic and to reduce its angular dependence. Increasing the active cross:section is a direct and economical strategy to enhance the current:carrying capability for REBCO coated conductors. Unfortunately, the high Jc in thin REBCO layers is seldom sustained in thick layers because of difficulties of thick film growth control. In the presence of strong 3D (pin separation far less than film thickness) pins, a high and thickness-independent (Jc) should result. One of major tasks of this thesis is to explore what are the effective strong 3D pins that develop a high and thickness-independent Jc. High and weak thickness-dependent Jc at 77 K is obtained on most recent coated conductors, and BZO nanorods and RE2O3 nanoparticles are identified as strong 3D pins contributing to this respectable Jc performance. At 77 K, we found that the strong pinning of BZO nanorods remains at least up to 9 T, whereas the strong pinning of RE2O3 nanoparticles gradually evolves to weak collective pinning as the irreversibility field is approached. The second principal part of this thesis concentrates on understanding and minimizing the angular dependence of Jc. Our study is based on the following procedure. First, we investigated the angular dependence of Jc (Jc(theta)) in the working condition of the future 32 T all-superconducting magnet, i.e. 4.2 K and high magnetic field up to 31 T. Our work shows that the low temperature Jc(theta) is Ginzburg-Landau-like at low fields and cusp-like towards the ab-plane at high fields. More interestingly, the typically observed Jc c-axis peak of BaZrO3 nanorods (BZO)-containing REBCO at high temperatures disappears at T le 40 K. We observed that Jc(H[is parallel to]c) follows well a power law with exponent alpha approx 0.5 for coated conductors without BZO nanorods and alpha approx 0.7 for coated conductors containing BZO nanorods. More importantly, BZO-containing coated conductors show higher and broader Jc(theta) at least up to 31 T, which is strongly beneficial to high field magnet applications. Finally, we performed Jc(theta) study over a broad temperature domain, 4.2 K to Tc and magnet fields up to 31 T. We found that weak uncorrelated pinning dominates the low temperature Jc. It raises and broadens Jc in the full angular range. We conclude that BZO nanorods induce dense random defects, like oxygen vacancies, atomic disorder etc., which can exert a large pinning effect at low temperatures where thermal fluctuations are small. Near the ab-plane there is clear evidence for strong correlated defects, which we deduce is due to intrinsic pinning by the Cu-O charge reservoir layers The last section discusses the pinning design relevant to coated conductors. Two types of thin films made by pulsed laser deposition (PLD) with well designed defects were studied- one shows Y2O3 precipitates and a high strain which also generates dense point pinning; the second one presents dense stacking faults. The main conclusion is that Jc(theta) can be modulated by tailoring the strain introduced by the mismatch between second phases and REBCO layer. Intrinsic pinning governs Hirr(H[is parallel to]ab), and stacking faults govern Jc(H[is parallel to]ab) and enhance Hirr(H[is parallel to]ab) at T ge 40 K. The thesis contains 8 chapters. The first chapter introduces the background and motivation of this work. Chapter 2 presents thickness dependence of Jc studies. Chapter 3 through chapter 6 present Jc(H, T, theta) characterization and pinning studies on REBCO coated conductors. Chapter 7 presents the pinning mechanisms found in PLD thin films grown with designed pinning structures. The summary and future work is presented in chapter 8.
