Glass-like low frequency ac response of ZrB$_{12}$ and Nb single crystals in the surface superconducting state

Details Glass-like low frequency ac response of ZrB$_{12}$ and Nb single crystals in the surface superconducting state Glass-like low frequency ac response of ZrB$_{12}$ and Nb single crystals in the surface superconducting state

2005-10-16

arxiv.org/abs/cond-mat/0510417v2

Physics

Condensed Matter

Superconductivity

9 pages, 12 figures

Scientific paper

10.1103/PhysRevB.73.104507

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 ($<3$ Hz). The wave function slope at the surface was found. The linear response of the order parameter to the ac excitation was extracted from the experimental data.

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