Magnetic behaviour of SO(5) superconductors

Details Magnetic behaviour of SO(5) superconductors Magnetic behaviour of SO(5) superconductors

2002-07-12

arxiv.org/abs/cond-mat/0207330v1

Physics

Condensed Matter

Superconductivity

7 pages, 5 figures. Talk given at MRST Conference on High Energy Physics (2002), Perimeter Institute, Waterloo, Ontario

Scientific paper

10.1063/1.1524562

The distinction between type I and type II superconductivity is re-examined in the context of the SO(5) model recently put forth by Zhang. Whereas in conventional superconductivity only one parameter (the Ginzburg-Landau parameter $\kappa$) characterizes the model, in the SO(5) model there are two essential parameters. These can be chosen to be $\kappa$ and another parameter, $\beta$, related to the doping. There is a more complicated relation between $\kappa$ and the behaviour of a superconductor in a magnetic field. In particular, one can find type I superconductivity even when $\kappa$ is large, for appropriate values of $\beta$.

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