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

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

2000-09-20

arxiv.org/abs/cond-mat/0009308v1

Phys. Rev. Lett. 86, 3630 (2001)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.86.3630

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 \omega. With decreasing temperature the dissipative component of Z exhibits, at a temperature T*(\omega) 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*(\omega), appears to be frozen at the time scales 1/\omega of the experiments.

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