Physics – Condensed Matter – Superconductivity
Scientific paper
2004-09-23
Eur. Phys. J. B 45 (2005) 47-53
Physics
Condensed Matter
Superconductivity
6 pages, 6 embedded figures
Scientific paper
10.1016/j.physc.2011.04.015
We report on transient effects in the microwave second-order 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 about 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.
Gallitto Agliolo A.
Giunchi Giovanni
Vaglica Gabriella
Vigni Li
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