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Absence of magnetic pair breaking in Zn-doped YBa2Cu3O7.

63 Cu(2) NMR linewidths in Zn-doped YBa 2 Cu 3 O 7 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 CuO 2 planes. The estimated moment-carrier exchange, J eff =20 meV, is more than an order of magnitude too small to account for the suppression of T c 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