Issue |
Europhys. Lett.
Volume 43, Number 6, September II 1998
|
|
---|---|---|
Page(s) | 701 - 706 | |
Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
DOI | https://doi.org/10.1209/epl/i1998-00420-8 | |
Published online | 01 September 2002 |
The gap maximum of anisotropic superconductors
Laboratoire de Physique Statistique de l'Ecole Normale Supérieure, associé au CNRS et aux Universités Paris 6 et Paris 7 - 24 rue Lhomond, 75005 Paris, France
Received:
4
March
1998
Accepted:
27
July
1998
For a completely general anisotropic order parameter (including
changes of sign), we show that weak-coupling theory is incompatible
with high values of the maximum of the zero-temperature
gap as compared to the critical temperature Tc, such as
those found experimentally in
where
.
This gives evidence for strong-coupling effects. In particular
this comes as a major
support for a spin fluctuation mechanism with strong coupling,
if one assumes that only a repulsive pairing interaction is
at work in high-
superconductors.
PACS: 74.20.Fg – BCS theory and its development / 74.25.Jb – Electronic structure / 74.72.Bk – Y-based cuprates
© EDP Sciences, 1998
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