Pairing Mechanism and Anisotropy of <I>d</I>-Vector of Spin-Triplet Superconductor Sr<SUB>2</SUB>RuO<SUB>4</SUB>

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  • Yoshioka Yu
    Division of Materials Physics, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University
  • Miyake Kazumasa
    Division of Materials Physics, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University

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  • Pairing mechanism and anisotropy of d-vector of spin-triplet superconductor Sr2RuO4

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Abstract

The anisotropy of the d-vector of the spin-triplet superconductor Sr2RuO4 is investigated on the basis of a d–p model where the Coulomb interaction Upp at the O site is taken into account together with Udd at the Ru site. It is shown in the third-order perturbation for the pairing interaction that Upp induces the spin-triplet pairing of (sinpx+isinpy) symmetry. The piaring state with the d-vector in the RuO2 plane is stabilized by the atomic spin–orbit interaction and Hund’s rule coupling at the Ru site, in contrast to the result based on the multiband Hubbard model without Upp. This result is consistent with that obtained by the Knight shift measurement.

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