Evidence for Surface Andreev Bound states in Cuprate Superconductors from Penetration Depth Measurements

Details Evidence for Surface Andreev Bound states in Cuprate Superconductors from Penetration Depth Measurements Evidence for Surface Andreev Bound states in Cuprate Superconductors from Penetration Depth Measurements

2000-11-10

arxiv.org/abs/cond-mat/0011182v1

Phys. Rev. Lett 86, 1074 (2001).

Physics

Condensed Matter

Superconductivity

4 pages 2 column revtex + 4 postscript figures. Submitted to PRL

Scientific paper

10.1103/PhysRevLett.86.1074

Tunneling and theoretical studies have suggested that Andreev bound states form at certain surfaces of unconventional superconductors. Through studies of the temperature and field dependence of the in-plane magnetic penetration depth lambda_ab at low temperature, we have found strong evidence for the presence of these states in clean single crystal YBCO and BSCCO. Crystals cut to expose a [110] interface show a strong upturn in lambda_ab at around 7K, when the field is oriented so that the supercurrents flow around this surface. In YBCO this upturn is completely suppressed by a field of ~0.1 T.

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