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

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

2000-03-17

arxiv.org/abs/cond-mat/0003296v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 eps figures, revtex

Scientific paper

10.1103/PhysRevLett.85.4586

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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