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S. E. Barrett; J. A. Martindale; D. J. Durand; C. H. Pennington; C. P. Slichter; T. A. Friedmann; J. P. Rice; D. M. Ginsberg

doi:10.1103/PhysRevLett.66.108

Anomalous behavior of nuclear spin-lattice relaxation rates in ${YBa}_{2}$ ${Cu}_{3}$ $O_{7}$ below $T_{c}$

S. E. Barrett, J. A. Martindale, D. J. Durand, C. H. Pennington, C. P. Slichter, T. A. Friedmann, J. P. Rice, and D. M. Ginsberg

Phys. Rev. Lett. 66, 108 – Published 7 January 1991

Abstract

The authors have measured the change in the anisotropy of the NMR spin-lattice relaxation rates for ${}^{63}{Cu}$ (2), ${}^{17}O$ (2,3), and ${}^{89}Y$ between the normal and superconducting states of ${YBa}_{2}$ ${Cu}_{3}$ $O_{7}$ . These results cannot be explained by a straightforward extension to T< $T_{c}$ of current theories, such as the theory of Millis, Monien, and Pines of normal-state NMR relaxation.