Orthorhombicity mixing of s- and d- gap components in $YBa_2Cu_3O_7$ without involving the chains

Details Orthorhombicity mixing of s- and d- gap components in $YBa_2Cu_3O_7$ without involving the chains Orthorhombicity mixing of s- and d- gap components in $YBa_2Cu_3O_7$ without involving the chains

1997-05-13

arxiv.org/abs/cond-mat/9705114v1

Physics

Condensed Matter

LATEX file and 3 Postscript figures

Scientific paper

10.1103/PhysRevB.57.R732

Momentum decoupling develops when forward scattering dominates the pairing interaction and implies tendency for decorrelation between the physical behavior in the various regions of the Fermi surface. In this regime it is possible to obtain anisotropic s- or d-wave superconductivity even with isotropic pairing scattering. We show that in the momentum decoupling regime the distortion of the $CuO_2$ planes is enough to explain the experimental reports for s- mixing in the dominantly d-wave gap of $YBa_2Cu_3O_7$. In the case of spin fluctuations mediated pairing instead, a large part of the condensate must be located in the chains in order to understand the experiments.

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