Precise analysis of anisotropy of the d-vector in spin-triplet superconductor Sr2RuO4

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It has been considered that a quasi-two-dimensional ruthenate Sr2RuO4 is a spin-triplet superconductor and therefore its superconducting state is characterized by so-called “d-vector”. In the present study, we analyzed the pairing symmetry, on the basis of the precise electronic structure obtained from first-principles calculation. As a result, the favorable pairing symmetry was turned out to be singlet dx2-y2-wave, rather than triplet p-wave, in contrast to precedent studies based on simple Hubbard models. Concerning the triplet pairing state, removing degeneracy of d-vector states by the Ru4d spin-orbit coupling, we could demonstrate that the chiral state with d//c is the most stable.