Angular position of nodes in the superconducting gap of YBCO

Details Angular position of nodes in the superconducting gap of YBCO Angular position of nodes in the superconducting gap of YBCO

1996-11-08

arxiv.org/abs/cond-mat/9611063v1

Physics

Condensed Matter

Superconductivity

10 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.78.2624

The thermal conductivity of a YBCO single crystal has been studied as a function of the relative orientation of the crystal axes and a magnetic field rotating in the Cu-O planes. Measurements were carried out at several temperatures below T_c and at a fixed field of 30 kOe. A four-fold symmetry characteristic of a superconducting gap with nodes at odd multiples of 45 degrees in k-space was resolved. Experiments were performed to exclude a possible macroscopic origin for such a four-fold symmetry such as sample shape or anisotropic pinning. Our results impose an upper limit of 10% on the weight of the s-wave component of the essentially d-wave superconducting order parameter of YBCO.

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