Impurity scattering in d+s wave superconductivity
Physique des Solides, Université Paris-Sud - 91405 Orsay, France
2 Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089-0484, USA
Accepted: 15 December 1995
We study non-magnetic impurity effects on a two-dimensional d+s model which we have introduced earlier to account for orthorhombicity in high-Tc compounds. Tc decreases when the impurity concentration increases similarly to the d model, except for the appearance of a small tail near the critical concentration where . But, in sharp contrast, in the same region, the density of states at the Fermi energy shows that an energy gap opens up, indicating a tendency for the d+s model to become more s -like; this should be accessible by specific-heat or NMR experiments.
PACS: 74.72.-h – High-Tc cuprates / 74.20.-z – Superconductivity: theory / 74.10.+v – Occurrence, potential candidates
© EDP Sciences, 1996