Theoretical Description of Nearly Discontinuous Transition in Superconductors with Paramagnetic Depairing

Details Theoretical Description of Nearly Discontinuous Transition in Superconductors with Paramagnetic Depairing Theoretical Description of Nearly Discontinuous Transition in Superconductors with Paramagnetic Depairing

2003-03-26

arxiv.org/abs/cond-mat/0303540v4

J.Phys.Soc.Jpn. 72, 2460 (2003)

Physics

Condensed Matter

Superconductivity

Publication version. See cond-mat/0306060 regarding a corresponding long paper

Scientific paper

10.1143/JPSJ.72.2460

Based on a theoretical argument and Monte Carlo simulations of a Ginzburg-Landau model derived microscopically, it is argued that, in type-II superconductors where {\it both} the paramagnetic {\it and} orbital depairings are important, a strong first-order transition (FOT) at $H_{c2}$ expected in the mean field (MF) approximation never occurs in real systems and changes due to the fluctuation into a crossover. The present result explains why a {\it nearly} discontinuous crossover at $H_{c2}$ with {\it no} intrinsic hysteresis is observed only in a clean superconducting material with a singlet pairing and a high condensation energy such as CeCoIn$_5$.

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