Triplanar Model for the Gap and Penetration Depth in YBCO

Details Triplanar Model for the Gap and Penetration Depth in YBCO Triplanar Model for the Gap and Penetration Depth in YBCO

1996-12-11

arxiv.org/abs/cond-mat/9612106v1

Phys. Rev. B 55, 8520 (1997)

Physics

Condensed Matter

Superconductivity

To appear in Physical Review B1 01Mar97; 12 pages with 10 figures; RevTeX+epsf

Scientific paper

10.1103/PhysRevB.55.8520

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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