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 \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.
Cite
@article{arxiv.cond-mat/9507013,
title = {Antiferromagnetic Interactions and the Superconducting Gap Function},
author = {R. J. Radtke and A. I. Liechtenstein and V. M. Yakovenko and S. Das Sarma},
journal= {arXiv preprint arXiv:cond-mat/9507013},
year = {2009}
}
Comments
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