Nonmagnetic Impurity Scattering in a dx2−y2 Superconductor near a Van Hove Point: Zn versus Ni in the Cuprates
R. Fehrenbacher
DOI 10.1103/PhysRevLett.77.1849 · Physical Review Letters
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Abstract
We consider the effect of nonmagnetic impurities in a dx2−y2 superconductor with ɛF 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 |u|≈1−2 eV. The residual DOS at ɛF and the Tc 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, u.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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