AC magnetic response of superconducting YBa2Cu3O7/PrBa2Cu3O7 superlattices | Zendy

L. Miu | Zendy; A. Ionescu | Zendy; Dana Miu | Zendy

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AC magnetic response of superconducting YBa2Cu3O7/PrBa2Cu3O7 superlattices

Author(s) -

L. Miu,

A. Ionescu,

Dana Miu

Publication year - 2016

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4955290

Subject(s) - condensed matter physics , superconductivity , vortex , superlattice , pinning force , physics , creep , relaxation (psychology) , magnetic field , drag , vorticity , materials science , critical current , mechanics , quantum mechanics , thermodynamics , psychology , social psychology

Vortex activation energy UAC in the critical-state related AC magnetic response of superconductors (appearing in the vicinity of the DC irreversibility line) takes large values, as often reported, which is not yet understood. This behavior is essentially different from that of the vortex-creep activation energy at long relaxation time scales, and may become important for AC applications of superconductors. To elucidate this aspect, we investigated the AC signal of almost decoupled [Y Ba2Cu3O7]n/[PrBa2Cu3O7]4 superlattices (with n = 11 or 4 units cells) in perpendicular DC and AC magnetic fields. In these model samples, the length of the hopping vortex segment is fixed by the thickness of superconducting layers and vortices are disentangled, at least at low DC fields. It is shown that the high UAC values result from the large contribution of the pinning enhanced viscous drag in the conditions of thermally activated, non-diffusive vortex motion at short time scales, where the influence of thermally induced vortex fluctuations on pinning is weak

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