| Issue |
Europhys. Lett.
Volume 42, Number 3, May I 1998
|
|
|---|---|---|
| Page(s) | 319 - 324 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00249-7 | |
| Published online | 01 September 2002 | |
Field-induced crossover of criticalities of vortex dynamics in
thin films
1
Abteilung Festkörperphysik, Universität Ulm, D-89069
Ulm, Germany
2
National Laboratory for Superconductivity, Institute of Physics and
Center for Condensed Matter Physics, P.O. Box 603, Beijing 100080, PRC
3
Department of Electronics, Nankai University, Tianjing 300071, PRC
Received:
30
January
1998
Accepted:
11
March
1998
By analyzing I-V characteristics (E-j curves), which were experimentally
determined on 
thin films in magnetic fields Be
varying from 0 T to 5 T, we find that the transition of the linear resistivity
signaling superconductivity exhibits different
criticalities for different magnetic fields. Starting with a
Berezinskii-Kosterlitz-Thouless transition at 
for
, one induces a crossover to a quasi-2D or 3D
vortex-glass transition at a finite Tg for magnetic fields below a few
kOe, and finally a "true” 2D vortex-glass with 
for
higher fields. We argue that this field-induced crossover of criticalities is a
general feature of all strongly anisotropic high-Tc superconductors.
PACS: 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics / 74.60.Jg – Critical currents / 74.72.Fq – Tl-based cuprates
© EDP Sciences, 1998
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