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Fisher L. M. Response of HTS tapes to a parallel ac magnetic field in the vicinity of the superconducting transition [Електронний ресурс] / L. M. Fisher, I. F. Voloshin, V. A. Yampolskii // Физика низких температур. - 2013. - Т. 39, № 12. - С. 1310-1315. - Режим доступу: http://nbuv.gov.ua/UJRN/PhNT_2013_39_12_5 We have studied the temperature dependence of the ac magnetic susceptibility <$Echi (T)~=~chi prime (T)~+~chi symbol Т (T)> of YBCO tapes in a parallel magnetic field in both the Meissner and vortex states. For the vortex state, we have observed two maximums in the <$Echi symbol Т (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 <$Echi prime (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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