High-field phase diagram of type II superconductors with paramagnetic depairing effect is examined through a theoretical argument and a numerical simulation of a Ginzburg-Landau model with a negative quartic term. Our results strongly suggest, contrary to the argument based on magnetization data in CeCoIn5, that the first-order transition at Hc2(T) in the mean field (MF) approximation is reflected in real systems merely as a crossover and that the thermal phase diagram is similar to that in the ordinary case where the MF transition is of second order.
- Paramagnetic effect
- Superconducting fluctuation
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering