| Issue |
Europhys. Lett.
Volume 51, Number 1, July I 2000
|
|
|---|---|---|
| Page(s) | 96 - 102 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00341-6 | |
| Published online | 01 September 2002 | |
Vortex-pair unbinding in the normal state of two-dimensional short–coherence-length superconductors
Department of Physics, Boston College - Chestnut Hill, MA 02167, USA
Received:
16
August
1999
Accepted:
3
May
2000
We study the superconducting transition in the attractive Hubbard model
in two dimensions using the self-consistent T-matrix approximation.
We demonstrate that for large systems, this approximate
method produces XY critical scaling
in the correlation length and pair susceptibility.
Our data also exhibits XY finite-size scaling.
For the parameters considered,
the critical regime is quite large, extending beyond 5 times 
.
We discuss the role of vortex-pair unbinding in the normal state
in the context of pseudogap behaviour and the relevance to
the physics of underdoped cuprates.
PACS: 74.25.-q – General properties; correlations between physical properties in normal and superconducting states / 74.20.-z – Theories and models of superconducting state / 74.25.Dw – Superconductivity phase diagrams
© EDP Sciences, 2000
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