Abstract
The NMR spin-lattice relaxation rate, can be measured precisely by progressive saturation. This efficient technique is useful when is long and the NMR signal is weak. We derive the quasiequilibrium spin response to excitation in the case of a Zeeman spectrum in the presence of quadrupolar interactions. Exact solutions for the recovery of magnetization under the influence of purely magnetic fluctuations for and are presented. This is the general solution to a problem that has been previously solved only for the case. An important example for the application of this technique is NMR in cuprate superconductors We show comparisons of the theory with the relaxation measured for high-temperature superconducting materials and the NMR-rates measured by this technique across the vortex-broadened spectrum at low temperature.
- Received 30 October 2000
DOI:https://doi.org/10.1103/PhysRevB.64.024520
©2001 American Physical Society