Antiferromagnetic Interactions and the Superconducting Gap Function

R. J. Radtke; A. I. Liechtenstein; V. M. Yakovenko; S. Das Sarma

doi:10.1103/physrevb.53.5137

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Antiferromagnetic Interactions and the Superconducting Gap Function

R. J. Radtke·A. I. Liechtenstein·V. M. Yakovenko·S. Das Sarma

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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.

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R. J. Radtke, A. I. Liechtenstein, V. M. Yakovenko, S. Das Sarma. 1996-04-05. Antiferromagnetic Interactions and the Superconducting Gap Function. https://doi.org/10.1103/physrevb.53.5137

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