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APS » Journals » Phys. Rev. B » Volume 53 » Issue 9
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Phys. Rev. B 53, 5137–5140 (1996)

Antiferromagnetic interactions and the superconducting gap function

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R. J. Radtke
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742-4111

A. I. Liechtenstein
Max-Planck-Institut f ür Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Federal Republic of Germany

V. M. Yakovenko and S. Das Sarma
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742-4111

Received 31 October 1995; published in the issue dated 1 March 1996

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.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.53.5137
DOI:
10.1103/PhysRevB.53.5137
PACS:
74.20.Fg, 74.25.Dw, 74.72.-h
 
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