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

Menachem I. Tsindlekht·Grigory I. Leviev·Valery M. Genkin·Israel Felner·Yurii B. Paderno·Vladimir B. Filippov
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Abstract

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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Menachem I. Tsindlekht, Grigory I. Leviev, Valery M. Genkin, Israel Felner, Yurii B. Paderno, Vladimir B. Filippov. 2005-10-18. Glass-like low frequency ac response of ZrB$_{12}$ and Nb single crystals in the surface superconducting state. https://doi.org/10.1103/physrevb.73.104507

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