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Proceedings Paper

Gap anisotropy and van Hove singularities in high-Tc superconductors
Author(s): Julien Bok; Jacqueline Bouvier
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Paper Abstract

We compute the superconducting gap (Delta) k using a simple band structure of the CuO2 planes in the high Tc materials. We suppose that for materials with doping corresponding to maximum Tc, the van Hove singularities lie close to the Fermi level as is confirmed by many photoemission experiments. We use an electron-phonon interaction with weak screening, we find a strong gap anisotropy. For Bi 2212, (Delta) is maximum along the 100 an 010 directions with values between 20 and 30 meV and minimum along 110 with values between 0 and 10 meV. We use this anisotropic gap to compute the quasi-particle excitations density of states and the tunneling current-voltage I(V) characteristic for N-I-S and S-I-S junctions. This model agrees remarkably well with recent experiments of tunneling spectroscopy in high Tc cuprates.

Paper Details

Date Published: 10 June 1996
PDF: 15 pages
Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); doi: 10.1117/12.241742
Show Author Affiliations
Julien Bok, Ecole Superieure de Physique et Chimie Industrielles (France)
Jacqueline Bouvier, Ecole Superieure de Physique et Chimie Industrielles (France)

Published in SPIE Proceedings Vol. 2696:
Spectroscopic Studies of Superconductors
Ivan Bozovic; Dirk van der Marel, Editor(s)

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