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Coexisting superconducting and spiral spin orders: models of ruthenate

A. A. Ovchinnikov·M. Ya. Ovchinnikova
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Abstract

Influence of a spiral spin structure on the superconducting (SC) pairing in the most probable active $γ$ band of $Sr_2RuO_4$ is studied in the mean field approximation. Such structure with "incommensurate" vector $Q=2π(1/3,1/3)$ has been proposed as that which removes the nesting instability in $\alfa, \betta$ bands. The model pairing interaction of adjacent centres is adopted. The mixed singlet and triplet SC order is revealed. The d-wave singlet pairing is accompanied by formation of the p-wave triplet pairs with large total momentum Q and spin projections $\pm 1$ onto axis normal to the spin rotation plane of the spiral structure. Both the superconducting and normal states have a broken time reversal symmetry which might be detected by polarised photoemission.

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A. A. Ovchinnikov, M. Ya. Ovchinnikova. 2002-05-25. Coexisting superconducting and spiral spin orders: models of ruthenate. https://arxiv.org/abs/cond-mat/0205529

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