Antiferromagnetic interactions and the superconducting gap function.

  title={Antiferromagnetic interactions and the superconducting gap function.},
  author={Radtke and Liechtenstein and Yakovenko and S DasSarma},
  journal={Physical review. B, Condensed matter},
  volume={53 9},
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… 
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