Paramagnetic Meissner effect and finite spin susceptibility in an asymmetric superconductor

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Lianyi He, Meng Jin, and Pengfei Zhuang
Physics Department, Tsinghua University, Beijing 100084, China

Received 29 September 2005; revised 5 December 2005; published 24 January 2006

Ageneral analysis of Meissner effect and spin susceptibility of auniform superconductor in an asymmetric two-component fermion system is presentedin nonrelativistic field theory approach. We found that the pairingmechanism dominates the magnetization property of superconductivity and the asymmetryenhances the paramagnetism of the system. At the turning pointfrom BCS to breached pairing superconductivity, the Meissner mass squaredand spin susceptibility are divergent at zero temperature. In thebreached pairing state induced by chemical potential difference and massdifference between the two kinds of fermions, the system goesfrom paramagnetism to diamagnetism, when the mass ratio of thetwo species increases.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.73.024511
DOI:	10.1103/PhysRevB.73.024511
PACS:	74.20.-z; 12.38.Mh 74.20.-z Theories and models of superconducting state 12.38.Mh Quark–gluon plasma YEAR: 2006
KEYWORDS:	Meissner effect, paramagnetic materials, magnetic susceptibility, superconducting materials, fermion systems, magnetisation, BCS theory, diamagnetic materials

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