Volume 74, Number 5, June 2006
|Page(s)||889 - 895|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||28 April 2006|
Vortex origin of tricritical point in Ginzburg-Landau theory
Freie Universität Berlin, Institut für Theoretische Physik Arnimallee 14, D-14195 Berlin, Germany
Accepted: 30 March 2006
Motivated by recent experimental progress in the critical regime of high-Tc superconductors, we show how the tricritical point in a superconductor can be derived from the Ginzburg-Landau theory as a consequence of vortex fluctuations. Our derivation explains why usual renormalization group arguments always produce a first-order transition, in contrast to experimental evidence and Monte Carlo simulations.
PACS: 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.) / 74.25.Dw – Superconductivity phase diagrams / 68.35.Rh – Phase transitions and critical phenomena
© EDP Sciences, 2006
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