Collective pinning of a frozen vortex liquid in ultrathin superconducting YBa_2Cu_3O_7 films
arXiv:cond-mat/0009308 · doi:10.1103/PhysRevLett.86.3630
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.
4 pages, 3 figures, submitted to Phys. Rev. Lett
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