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

  • Solid and Condensed State Physics
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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.

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Agliolo Gallitto, A., Giunchi, G., Li Vigni, M. et al. Surface-barrier effects in the microwave second-harmonic response of superconductors in the mixed state. Eur. Phys. J. B 45, 47–53 (2005). https://doi.org/10.1140/epjb/e2005-00163-x

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