Abstract
We report nuclear quadrupole resonance (NQR) and nuclear magnetic resonance (NMR) measurements of the spin lattice and Gaussian spin-spin relaxation times, and , respectively, in an unaligned (NQR) and aligned (NMR) powder of Y. Experimental details, critical for accurate NQR measurements in this system, are discussed. The normal-state data are analyzed using several models. Evidence for the existence of a spin gap is presented. The normal-state data agree well with an analysis using scaling theory predictions for quantum critical and quantum disordered regimes. The superconducting state data agree with recent calculations for -wave superconductivity.
- Received 6 September 1995
DOI:https://doi.org/10.1103/PhysRevB.53.5907
©1996 American Physical Society