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Collective pinning of a frozen vortex liquid in ultrathin superconducting YBa_2Cu_3O_7 films

M. Calame·S. E. Korshunov·Ch. Leemann·P. Martinoli
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Abstract

The linear dynamic response of the two-dimensional (2D) vortex medium in ultrathin YBa_2Cu_3O_7 films was studied by measuring their ac sheet impedance Z over a broad range of frequencies ω. With decreasing temperature the dissipative component of Z exhibits, at a temperature T*(ω) well above the melting temperature of a 2D vortex crystal, a crossover from a thermally activated regime involving single vortices to a regime where the response has features consistent with a description in terms of a collectively pinned vortex manifold. This suggests the idea of a vortex liquid which, below T*(ω), appears to be frozen at the time scales 1/ωof the experiments.

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M. Calame, S. E. Korshunov, Ch. Leemann, P. Martinoli. 2000-09-20. Collective pinning of a frozen vortex liquid in ultrathin superconducting YBa_2Cu_3O_7 films. https://doi.org/10.1103/physrevlett.86.3630

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