Effect of Band Structure on the Symmetry of Superconducting States

Details Effect of Band Structure on the Symmetry of Superconducting States Effect of Band Structure on the Symmetry of Superconducting States

2001-02-05

arxiv.org/abs/cond-mat/0102075v2

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1143/JPSJ.70.2698

Effects of the band structure on the symmetry of superconducting (SC) states are studied. For a square lattice system with a nearest-neighbor attractive interaction, SC states with various symmetries are found by changing the band structure, or, the shape of the Fermi surface. The spin-triplet ($(p_x + ip_y)$-wave) and spin-singlet ($d$- or s-wave) SC states, and states with their coexistence ($d + ip_y$, $s + ip_y$) can be stabilized within the same type of interaction. The stability of interlayer-pairing states with line nodes is also examined, and its relation to the SC state of Sr$_2$RuO$_4$ is discussed.

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