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Surface-barrier effects in the microwave second-harmonic response of superconductors in the mixed state

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  • A. Agliolo Gallitto
  • G. Giunchi
  • M. Li Vigni
  • G. Vaglica

Abstract

We report on transient effects in the microwave second-harmonic response of different type of superconductors in the mixed state. The samples have contemporarily been exposed to a dc magnetic field, varying with a constant rate of 60 Oe/s, and a pulsed microwave magnetic field. The time evolution of the signal radiated at the second-harmonic frequency of the driving field has been measured for about 500 s from the instant in which the dc-field sweep has been stopped, with sampling time of ~0.3 s. We show that the second-harmonic signal exhibits two relaxation regimes; an initial exponential decay, which endures roughly 10 s, and a logarithmic decay in the time scale of minutes. Evidence is given that the decay in the time scale of minutes is ruled by magnetic relaxation over the surface barrier. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Suggested Citation

  • A. Agliolo Gallitto & G. Giunchi & M. Li Vigni & G. Vaglica, 2005. "Surface-barrier effects in the microwave second-harmonic response of superconductors in the mixed state," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 45(1), pages 47-53, May.
    • Handle: RePEc:spr:eurphb:v:45:y:2005:i:1:p:47-53
    DOI: 10.1140/epjb/e2005-00163-x
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