Physics – Condensed Matter – Superconductivity
Scientific paper
1998-05-13
Phys. Rev. B 58, 11197 (1998)
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures, to be published in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.58.11197
We have performed a detailed study of the tunneling spectra of bicrystal grain boundary junctions (GBJs) fabricated from the HTS YBCO, BSCCO, LSCO, and NCCO. In all experiments the tunneling direction was along the CuO planes. With the exception of NCCO, for all materials a pronounced zero bias conductance peak was observed which decreases with increasing temperature and disappears at the critical temperature. These results can be explained by the presence of a dominating d-wave symmetry of the order parameter resulting in the formation of zero energy Andreev bound states at surfaces and interfaces of HTS. The absence of a ZBCP for NCCO is consistent with a dominating s-wave symmetry of the pair potential in this material. The observed nonlinear shift of spectral weight to finite energies by applying a magnetic field is in qualitative agreement with recent theoretical predictions.
Alff Lambert
Bauch Th.
Beck Alexander
Gross Ralf
Kleefisch S.
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