Antiferromagnetic Interactions and the Superconducting Gap Function

Abstract

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 π/ 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.

4 pages, RevTeX with psfig, 2 PostScript figures included in compressed form, one color PostScript figure available by request to [email protected] or [email protected]. Minor changes and updated references from original posting

References in corpus (2)

• s-wave superconductivity from antiferromagnetic spin-fluctuation model for bilayer materials
• Superconducting Order Parameter in Bi-Layer Cuprates: Occurrence of $\pi$ Phase Shifts in Corner Junctions

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