Off-Site Repulsion-Induced Triplet Superconductivity: A Possibility for Chiral px+y-Wave Pairing in Sr2RuO4

Ryotaro Arita; Seiichiro Onari; Kazuhiko Kuroki; Hideo Aoki

doi:10.1103/PhysRevLett.92.247006

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Off-Site Repulsion-Induced Triplet Superconductivity: A Possibility for Chiral px+y-Wave Pairing in Sr2RuO4

Ryotaro Arita, Seiichiro Onari, Kazuhiko Kuroki, Hideo Aoki

DOI 10.1103/PhysRevLett.92.247006 · Physical Review Letters

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Abstract

In order to probe the effect of charge fluctuations on triplet pairing, we study the pairing symmetry in the one-band Hubbard model having the off-site Coulomb repulsion (V) on top of the on-site repulsion as a model for the γ band of Sr2RuO4, a strong candidate for a triplet pairing superconductor. The result, obtained with the dynamical cluster approximation combined with the quantum Monte Carlo method, and confirmed from the fluctuation exchange approximation, shows that while dx2−y2 pairing dominates over p in the absence of V, introduction of V makes px+y and dxy dominant. The gap function for the chiral px+y+ipx−y has nodes that are consistent with the recent measurement of specific heat in rotated magnetic fields in the ruthenate. This suggests that the off-site repulsion may play an essential role in triplet superconductivity in this material.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown