Glass-like low frequency ac response of ZrB$_{12}$ and Nb single crystals in the surface superconducting state
We report experimental studies of the low frequency electrodynamics of ZrB$_{12}$ and Nb single crystals. AC susceptibility at frequencies 3 - 1000 Hz have been measured under a dc magnetic field, $H_0$, applied parallel to the sample surface. In the surface superconducting state, for several $H_0$,...
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| Zusammenfassung: | We report experimental studies of the low frequency electrodynamics of
ZrB$_{12}$ and Nb single crystals. AC susceptibility at frequencies 3 - 1000 Hz
have been measured under a dc magnetic field, $H_0$, applied parallel to the
sample surface. In the surface superconducting state, for several $H_0$, the
real part of the ac magnetic susceptibility exhibits a logarithmic frequency
dependence as for spin-glass systems. Kramers-Kronig analysis of the
experimental data, shows large losses at ultra low frequencies ($ |
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| DOI: | 10.48550/arxiv.cond-mat/0510417 |