Cu spin dynamics and superconducting precursor effects in planes above Tc in YBa2Cu3O6.7

W. W. Warren, Jr., R. E. Walstedt, G. F. Brennert, R. J. Cava, R. Tycko, R. F. Bell, and G. Dabbagh
Phys. Rev. Lett. 62, 1193 – Published 6 March 1989
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Abstract

Spin dynamics at planar sites in oxygen-deficient YBa2Cu3O6+x have been investigated by nuclear spin-lattice relaxation measurements using 63,65Cu nuclear quadrupole resonance and Y89 NMR. A sharp decrease of Cu63 nuclear relaxation below 100 K in YBa2Cu3O6.7 suggests the possible onset of spin pairing in individual planes well above the transition to three-dimensional bulk superconductivity. Comparison of the relaxation rates for the 60-K superconductor YBa2Cu3O6.7 with those of YBa2Cu3O7.0 in the range 100300 K shows that the planar Cu(2) spin dynamics are strongly affected by changes in carrier concentration.

  • Received 19 December 1988

DOI:https://doi.org/10.1103/PhysRevLett.62.1193

©1989 American Physical Society

Authors & Affiliations

W. W. Warren, Jr., R. E. Walstedt, G. F. Brennert, R. J. Cava, R. Tycko, R. F. Bell, and G. Dabbagh

  • AT&T Bell Laboratories, Murray Hill, New Jersey 07974

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Vol. 62, Iss. 10 — 6 March 1989

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