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Triplanar Model for the Gap and Penetration Depth in YBCO

C. O'Donovan·J. P. Carbotte
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Abstract

YBaCuO_7 is a trilayer material with a unit cell consisting of a CuO_2 bilayer with a CuO plane of chains in between. Starting with a model of isolated planes coupled through a transverse matrix element, we consider the possibility of intra as well as interplane pairing within a nearly antiferromagnetic Fermi liquid model. Solutions of a set of three coupled BCS equations for the gap exhibit orthorhombic symmetry with s- as well as d-wave contributions. The temperature dependence and a-b in plane anisotropy of the resulting penetration depth is discussed and compared with experiment.

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C. O'Donovan, J. P. Carbotte. 1996-12-11. Triplanar Model for the Gap and Penetration Depth in YBCO. https://doi.org/10.1103/physrevb.55.8520

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