Antiferromagnetic Interactions and the Superconducting Gap Function

Details Antiferromagnetic Interactions and the Superconducting Gap Function Antiferromagnetic Interactions and the Superconducting Gap Function

1995-07-06

arxiv.org/abs/cond-mat/9507013v2

Phys. Rev. B 53, 5137 (1996)

Physics

Condensed Matter

4 pages, RevTeX with psfig, 2 PostScript figures included in compressed form, one color PostScript figure available by request

Scientific paper

10.1103/PhysRevB.53.5137

Spin-fluctuation-mediated superconductivity is conventionally associated with d_{x^2-y^2} pairing. We show that a generalized model of antiferromagnetic spin fluctuations in three dimensions may also yield a state with formal ``s-wave'' (A_{1g}) symmetry but with line nodes at k_z \approx \pm \pi / 2c. We study this new state within both BCS and Eliashberg theories using a realistic band structure and find that it is more stable than the d_{x^2-y^2} (B_{1g}) state over a wide range of parameters. Thus, models of spin-fluctuation-mediated superconductivity must consider both possibilities on an equal footing.

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