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Competition of Orbital Antiferromagnetism With Q-Triplet-Pairing in the Ferromagnetic Superconductor UGe2

G. Varelogiannis, P. Thalmeier, S. Tsonis

cond-mat.supr-conarXiv:cond-mat/0306106

Abstract

Within a multicomponent BCS-like framework we study the coexistence and competition of various CDW and SC order parameters in the presence of a strong ferromagnetic background. We find that the competition of unconventional CDW, also called orbital antiferromagnet, with SC at finite momentum ( Q-triplet pairing) shows unique characteristics like an extreme sensitivity on the deviations from nesting. We argue that pressure in UGe2 creates deviations from the nesting and report a phase diagram in qualitative agreement with the observed behavior of UGe2.

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