Coupling between planes and chains in YBa2Cu3O7 : a possible solution for the order parameter controversy

Details Coupling between planes and chains in YBa2Cu3O7 : a possible solution for the order parameter controversy Coupling between planes and chains in YBa2Cu3O7 : a possible solution for the order parameter controversy

1995-03-29

arxiv.org/abs/cond-mat/9503153v3

Physics

Condensed Matter

13 pages, revtex, 2 uucoded figures

Scientific paper

10.1103/PhysRevLett.75.3732

We propose to explain the contradictory experimental evidence about the symmetry of the order parameter in $YBa_{2}Cu_{3}O_{7} $ by taking into account the coupling between planes and chains. This leads to an anticrossing of the plane and chain band. We include an attractive pairing interaction within the planes and a repulsive one between planes and chains, leading to opposite signs for the order parameter on planes and chains, and to nodes of the gap because of the anticrossing. Our model blends s-wave and d-wave features, and provides a natural explanation for all the contradictory experiments

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