Collective pinning of a frozen vortex liquid in ultrathin superconducting YBa2Cu3O7 films

被引：11

作者：

Calame, M ^{[1
]}

Korshunov, SE

Leemann, C

Martinoli, P

机构：

[1] Univ Neuchatel, Inst Phys, CH-2000 Neuchatel, Switzerland

[2] LD Landau Theoret Phys Inst, Moscow 117940, Russia

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 16期

关键词：

D O I：

10.1103/PhysRevLett.86.3630

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The linear dynamic response of the two-dimensional (2D) vortex medium in ultrathin YBa2Cu3O7 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.

引用

页码：3630 / 3633

页数：4

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