Vortex Origin of Tricritical Point in Ginzburg-Landau Theory
Abstract
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.
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