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

DOI 10.1103/PhysRevB.53.5137 · Physical Review B

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Abstract

Spin-fluctuation-mediated superconductivity is conventionally associated with dx2−y2 pairing. We show that a generalized model of antiferromagnetic spin fluctuations in three dimensions may also yield a state with formal ‘‘s-wave’’ (A1g) symmetry but with line nodes at kz≊±π/2c. We study this state within both BCS and Eliashberg theories using a realistic band structure and find that it is more stable than the dx2−y2 (B1g) state over a wide range of parameters. Thus, models of spin-fluctuation-mediated superconductivity must consider both possibilities on an equal footing. © 1996 The American Physical Society.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La1-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown