Response of HTS tapes to a parallel ac magnetic field in the vicinity of the superconducting transition

Автор(и)

  • L.M. Fisher All-Russian Electrical Engineering Institute, Moscow 111250, Russian Federation Joint Stock Company “National Technical Physics and Automation Research Institute” Moscow 115230, Russian Federation
  • I.F. Voloshin All-Russian Electrical Engineering Institute, Moscow 111250, Russian Federation Joint Stock Company “National Technical Physics and Automation Research Institute” Moscow 115230, Russian Federation
  • V.A. Yampol’skii A.Ya. Usikov Institute for Radiophysics and Electronics, National Academy of Sciences of Ukraine Kharkov 61085, Ukraine

DOI:

https://doi.org/10.1063/1.4830419%20

Ключові слова:

high-temperature superconductivity, magnetic properties, vortex structures.

Анотація

We have studied the temperature dependence of the ac magnetic susceptibility χ(T) = χ′(T) + iχ″(T) of YBCO tapes in a parallel magnetic field in both the Meissner and vortex states. For the vortex state, we have observed two maximums in the χ″(T) dependence. The position and the magnitude of one of these maxima are described well by the nonlocal critical state model. The second maximum and corresponding kink in the function χ′(T) observed close to the temperature Tc of the superconducting transition are unexpected. The origin of this maximum cannot be explained within the usual notions of the high-temperature superconductivity. We suppose that it is related to some magnetic restructuring in the superconducting layer just above Tc. Our results put a question on the correctness of the interpretation of some previous microwave experiments.

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Опубліковано

2013-10-22

Як цитувати

(1)
Fisher, L.; Voloshin, I.; Yampol’skii, V. Response of HTS Tapes to a Parallel Ac Magnetic Field in the Vicinity of the Superconducting Transition. Fiz. Nizk. Temp. 2013, 39, 1310-1315.

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Розділ

Надпровідність, зокрема високотемпературна

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