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Spin-triplet superconductivity due to antiferromagnetic spin-fluctuation in Sr_2RuO_4

Takeshi Kuwabara·Masao Ogata
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Abstract

A mechanism leading to the spin-triplet superconductivity is proposed based on the antiferromagnetic spin fluctuation. The effects of anisotropy in spin fluctuation on the Cooper pairing and on the direction of d vector are examined in the one-band Hubbard model with RPA approximation. The gap equations for the anisotropic case are derived and applied to Sr_2RuO_4. It is found that a nesting property of the Fermi surface together with the anisotropy leads to the triplet superconductivity with the d=z(sin{k_x}\pm isin{k_y}), which is consistent with experiments.

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Takeshi Kuwabara, Masao Ogata. 2000-03-17. Spin-triplet superconductivity due to antiferromagnetic spin-fluctuation in Sr_2RuO_4. https://doi.org/10.1103/physrevlett.85.4586

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