Absence of magnetic pair breaking in Zn-doped YBa2Cu3O7

Walstedt R., Bell R., Schneemeyer L., Waszczak J., Warren Jr. W., Dupree R., ...More

Physical Review B, vol.48, no.14, pp.10646-10649, 1993 (Scopus) identifier identifier

  • Publication Type: Article / Article
  • Volume: 48 Issue: 14
  • Publication Date: 1993
  • Doi Number: 10.1103/physrevb.48.10646
  • Journal Name: Physical Review B
  • Journal Indexes: Scopus
  • Page Numbers: pp.10646-10649
  • Ondokuz Mayıs University Affiliated: Yes

Abstract

Cu63(2) NMR linewidths in Zn-doped YBa2Cu3O7 exhibit a predominant component proportional to T-1 in the normal state. We attribute this result to spin-exchange scattering of carriers from localized moments associated with Zn impurities in the CuO2 planes. The estimated moment-carrier exchange, Jeff=20 meV, is more than an order of magnitude too small to account for the suppression of Tc in this system via Abrikosov-Gorkov pair breaking. A suggested alternative explanation is pair breaking by strong potential scattering from the Zn impurity sites which requires d-wave pairing. © 1993 The American Physical Society.