U nuclear relaxation rates in an itinerant antiferromagnet USb

Baek, S.-H.*; Curro, N. J.*; Sakai, Hironori   ; Bauer, E. D.*; Cooley, J. C.*; Smith, J. L.*

U nuclear spin-lattice () and spin-spin () relaxation rates in the itinerant antiferromagnet USb are reported as a function of temperature in zero field. The heating effect from the intense rf pulses that are necessary for the U NMR results in unusual complex thermal recovery of the nuclear magnetization which does not allow measuring directly. By implementing an indirect method, however, we successfully extracted of the U. We find that the temperature dependence of for both U and Sb follows the power law () with the small exponent = 0.3 suggesting that the same relaxation mechanism dominates the on-site and the ligand nuclei, but an anomaly at 5 K was observed, possibly due to the change in the transferred hyperfine coupling on the Sb site.