Europhys. Lett.
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
Europhys. Lett., 74 (5), pp. 889-895 (2006)
DOI: 10.1209/epl/i2006-10029-5

Vortex origin of tricritical point in Ginzburg-Landau theory

H. Kleinert

Freie Universität Berlin, Institut für Theoretische Physik Arnimallee 14, D-14195 Berlin, Germany

received 25 January 2006; accepted in final form 30 March 2006
published online 28 April 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.

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