Paramagnetic Meissner effect and finite spin susceptibility in an asymmetric superconductor

Lianyi He; Meng Jin; Pengfei Zhuang

doi:10.1103/PhysRevB.73.024511

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Paramagnetic Meissner effect and finite spin susceptibility in an asymmetric superconductor

Lianyi He, Meng Jin, Pengfei Zhuang

DOI 10.1103/PhysRevB.73.024511 · Physical Review B

T1

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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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown