A crib-shaped triplet pairing gap function for an orthogonal pair of quasi-one dimensional Fermi surfaces in Sr$_2$RuO$_4$

Details A crib-shaped triplet pairing gap function for an orthogonal pair of quasi-one dimensional Fermi surfaces in Sr$_2$RuO$_4$ A crib-shaped triplet pairing gap function for an orthogonal pair of quasi-one dimensional Fermi surfaces in Sr$_2$RuO$_4$

2001-01-07

arxiv.org/abs/cond-mat/0101077v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, RevTeX, to appear in Phys.Rev.B (Rapid Communications)

Scientific paper

10.1103/PhysRevB.63.060506

The competition between spin-triplet and singlet pairings is studied theoretically for the tight-binding $\alpha$-$\beta$ bands in Sr$_2$RuO$_4$, which arise from two sets of quasi-one dimensional Fermi surfaces. Using multiband FLEX approximation, where we incorporate an anisotropy in the spin fluctuations as suggested from experiments, we show that (i) the triplet can dominate over the singlet (which turns out to be extended s), and (ii) the triplet gap function optimized in the Eliashberg equation has an unusual, very non-sinusoidal form, whose time-reversal-broken combination exhibits a crib-shaped amplitude with dips.

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