Paramagnetic Meissner Effect and Finite Spin Susceptibility in an Asymmetric Superconductor

Details Paramagnetic Meissner Effect and Finite Spin Susceptibility in an Asymmetric Superconductor Paramagnetic Meissner Effect and Finite Spin Susceptibility in an Asymmetric Superconductor

2005-09-28

arxiv.org/abs/hep-ph/0509317v3

Phys.Rev.B73:024511,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

17pages, 2 figures, published in Physical Review B

Scientific paper

10.1103/PhysRevB.73.024511

A general analysis of Meissner effect and spin susceptibility of a uniform superconductor in an asymmetric two-component fermion system is presented in nonrelativistic field theory approach. We found that, the pairing mechanism dominates the magnetization property of superconductivity, and the asymmetry enhances the paramagnetism of the system. At the turning point from BCS to breached pairing superconductivity, the Meissner mass squared and spin susceptibility are divergent at zero temperature. In the breached pairing state induced by chemical potential difference and mass difference between the two kinds of fermions, the system goes from paramagnetism to diamagnetism, when the mass ratio of the two species increases.

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