Gap anisotropy and van Hove singularities in high-Tc superconductors

Julien Bok; Jacqueline Bouvier

doi:10.1117/12.241742

10 June 1996 Gap anisotropy and van Hove singularities in high-T_c superconductors

Julien Bok, Jacqueline Bouvier

Proceedings Volume 2696, Spectroscopic Studies of Superconductors; (1996) https://doi.org/10.1117/12.241742
Event: Photonics West '96, 1996, San Jose, CA, United States

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 T_c, 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 T_c cuprates.

Citation Download Citation

Julien Bok and Jacqueline Bouvier "Gap anisotropy and van Hove singularities in high-T_c superconductors", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); https://doi.org/10.1117/12.241742

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