Journal ArticleDOI
Degradation of thin films of YBa2Cu3O7 by annealing in air and in vacuum
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In this article, the degradation of epitaxial thin films of YBa2Cu3O7 has been studied as a function of annealing temperature in air and in vacuum; some samples had an evaporated overlayer of CaF2.Abstract:
The degradation of epitaxial thin films of YBa2Cu3O7 has been studied as a function of annealing temperature in air and in vacuum; some samples had an evaporated overlayer of CaF2. Degradation was monitored by the measurement of electrical properties after consecutive 30-min annealing treatments. The room-temperature resistance registered significant increases for all samples after annealing at temperatures above about 200°C; the critical current density at 77 K was degraded for annealing temperatures ≥400°C in air, and ≥200–250°C in vacuum. By annealing in oxygen at 550°C, electrical properties were restored in degraded bare YBCO samples annealed in vacuum, but not for those annealed in air.read more
Citations
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Supporting data for: Soldered joints—an essential component of demountable high temperature superconducting fusion magnets
TL;DR: In this article, the electrical and thermal properties of demountable high temperature superconducting (HTS) joints were investigated by considering the fabrication and properties of jointed HTSs consisting of a thin layer of solder (In52Sn48 or Pb38Sn62) sandwiched between two rare earth-Ba2Cu3O7 (REBCO) second generation HTS coated conductors.
Journal ArticleDOI
Soldered joints—an essential component of demountable high temperature superconducting fusion magnets.
TL;DR: In this paper, the electrical and thermal properties of demountable high temperature superconducting (HTS) joints were investigated by considering the fabrication and properties of jointed HTSs consisting of a thin layer of solder sandwiched between two rare-earth-Ba2Cu3O7 (REBCO) second generation HTS coated conductors (CCs).
Journal ArticleDOI
Determination of Maximum Permissible Temperature Rise Considering Repetitive Over-Current Characteristics of YBCO Coated Conductors
Min Jae Kim,Min Cheol Ahn,Seong Eun Yang,Dong Keun Park,Young Jae Kim,Tae Kuk Ko,Chanjoo Lee,Bok-Yeol Seok +7 more
TL;DR: In this paper, stable maximum temperature criteria of YBCO coated conductors (CCs) were suggested considering degradation by repetitive exposure to excessive temperature rise, and the maximum permissible temperature rise of CC in superconducting fault current limiter (SFCL) was determined as 400 K.
Journal ArticleDOI
Impact of a REBCO coated conductor stabilization layer on the fault current limiting functionality
Marek Búran,Michal Vojenciak,Marek Mošať,Asef Ghabeli,Mykola Solovyov,Marcela Pekarčíková,Ľubomír Kopera,Fedor Gömöry +7 more
Journal ArticleDOI
Conductivity and dielectric properties of thin amorphous cerium dioxide films
TL;DR: In this paper, the dielectric properties of amorphous cerium dioxide in Au-CeO2-Au systems on strontium titanate substrates were investigated.
References
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Journal ArticleDOI
Anisotropy of oxygen tracer diffusion in single-crystal YBa 2 Cu 3 O 7-δ
TL;DR: Oxygen tracer diffusion has been measured in single-crystalline polycrystals from 300 to 650 in the c direction, at a few temperatures in the ab plane of twinned crystals, and in the b direction of an untwinned crystal as discussed by the authors.
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Passivation of high Tc superconductor surfaces with CaF2 and Bi, Al, and Si oxides
TL;DR: In this article, X-ray photoelectron spectroscopy has been used to investigate passivation of the high-temperature superconductors YBa2Cu3O7−x and Bi2Ca1+xSr2−xCu2O8+y involving overlayer materials deposited in vacuum onto freshly cleaved surfaces.
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Environmental Stability of High Tc Superconducting Ceramics
TL;DR: The discovery of high Tc superconductivity in layered cuprate ceramics has so far led to the identification of about 35 distinct superconducting cuprate systems, the latest of which is the 133 K-superconducting system Hg-Ba-Ca-Cu-O as mentioned in this paper.
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Oxygen transport in c-axis-oriented high-Tc superconducting YBa2Cu3O7-δ thin films, studied in situ by ellipsometry
TL;DR: For the oxygen transport in c-axis-oriented high-Tc superconducting YBa2Cu3O7-δ thin films, a rotating-analyzer ellipsometer has been used as an in situ monitor and an optical model is developed.
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Superior microwave properties by post‐annealing YBa2Cu3O7 thin films at low oxygen partial pressure
TL;DR: In this article, the surface resistance of YBa2Cu3O7 (YBCO) thin films with improved properties have been reported by post-annealing in a low partial pressure of oxygen, similar to that used by in situ methods.