Abstract
The authors report mmeasurements of the planar nuclear spin-lattice relaxation rates ) for the static field oriented along the a (c) axis in the superconducting state of . These measurements were made on a single sample as a function of temperature and magnetic field. The weak-field results are well explained by several recent calculations in terms of a BCS spin-singlet, orbital-d-wave pairing state. They also find that at low temperatures varies linearly with the applied magnetic field, suggesting that at high field it is dominated by fluxoid cores.
- Received 29 July 1991
DOI:https://doi.org/10.1103/PhysRevLett.68.702
©1992 American Physical Society