Abstract
The two-dimensional (2D) Hubbard model with binary diagonal disorder was used to study the effects of nonmagnetic (Zn) impurities on high-temperature superconductivity. Zn impurities strongly suppressed superconductivity. As evidenced by the increasing mean-field character of the pair-field and antiferromagnetic susceptibilities with Zn substitution, spin fluctuations beyond mean field that mediate pairing get suppressed. Consistent with experiments, Tc decreased linearly with impurity concentration. With increasing Zn content, a change of the magnetic susceptibility to Curie-Weiss-like behavior originating in the existence of free magnetic moments was found.
| Original language | English |
|---|---|
| Article number | 077001 |
| Pages (from-to) | 077001/1-077001/4 |
| Journal | Physical Review Letters |
| Volume | 89 |
| Issue number | 7 |
| DOIs | |
| State | Published - Aug 12 2002 |
| Externally published | Yes |
Funding
We acknowledge useful conversations with W. Putikka, D. J. Scalapino, Y. Wang, and M. Vojta. This work was supported by NSF Grant No. DMR-0073308. This research was supported in part by NSF Cooperative Agreement No. ACI-9619020 through computing resources provided by the National Partnership for Advanced Computational Infrastructure at the Pittsburgh Supercomputer Center.