The gap maximum of anisotropic superconductors

Details The gap maximum of anisotropic superconductors The gap maximum of anisotropic superconductors

1997-10-13

arxiv.org/abs/cond-mat/9710115v1

Europhys.Lett. 43, 701 (1998)

Physics

Condensed Matter

Superconductivity

5 pages, revtex, 1 figure

Scientific paper

10.1209/epl/i1998-00420-8

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 \Delta_{M} of the zero temperature gap as compared to the critical temperature T_{c}, such as those found experimentally in Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta} where 2 \Delta_{M} / T_{c} \approx 7.5 . 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 T_{c} superconductors.

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