Paramagnetic Meissner Effect and Finite Spin Susceptibility in an Asymmetric Superconductor

Abstract

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.

17pages, 2 figures, published in Physical Review B

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• Finite Temperature Phase Diagram of a Two-Component Fermi Gas with Density Imbalance
• Neutral Color Superconductivity Including Inhomogeneous Phases at Finite Temperature
• Fermion Cooper Pairing with Unequal Masses: Standard Field Theory Approach
• Stable Sarma State in Two-band Fermi Systems
• Relativistic model for electron-hole pairing in the superconducting state of graphene-based materials
• Magnetic Stability Analysis for Abelian and Non-Abelian Superconductors
• Stability of the Breached Pair State for a Two-species Fermionic System in the Presence of Feshbach Resonance
• Sound Velocity and Meissner Effect in Light-heavy Fermion Pairing Systems
• Phase diagrams of neutron-proton superfluid in asymmetric nuclear matter