Absence of magnetic pair breaking in Zn-doped YBa2Cu3O7

R. E. Walstedt, R. F. Bell, L. F. Schneemeyer, J. V. Waszczak, W. W. Warren, R. Dupree, A. Gencten

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99 Scopus citations


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.

Original languageEnglish
Pages (from-to)10646-10649
Number of pages4
JournalPhysical Review B
Issue number14
StatePublished - 1993


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