Abstract
Spin dynamics at planar sites in oxygen-deficient have been investigated by nuclear spin-lattice relaxation measurements using ,65Cu nuclear quadrupole resonance and NMR. A sharp decrease of nuclear relaxation below 100 K in 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 with those of in the range 100–300 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