Nonmagnetic Impurity Scattering in a {ital d}{sub {ital x}{sup 2}{minus}{ital y} {sup 2}} Superconductor near a Van Hove Point: Zn versus Ni in the Cuprates
- Max-Planck-Institut fuer Festkoeperforschung, Heisenbergstrasse 1, D-70569 Stuttgart (Germany)
We consider the effect of nonmagnetic impurities in a {ital d}{sub {ital x}{sup 2}{minus}{ital y}{sup 2}} superconductor with {var_epsilon}{sub {ital F}} close to a Van Hove singularity. It is shown that the nontrivial density of states (DOS) allows for resonant scattering already at intermediate potential strengths {vert_bar}{ital u}{vert_bar}{approx_equal}12 eV. The residual DOS at {var_epsilon}{sub {ital F}} and the {ital T}{sub {ital c}} suppression rate are found to depend strongly on the carrier concentration. Quantitative agreement with experiments on Zn and Ni doped cuprates is obtained by adjusting a single parameter, {ital u}. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 383309
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 77; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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