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U nuclear relaxation rates in an itinerant antiferromagnet USb
Baek, S.-H.*; Curro, N. J.*; 酒井 宏典; Bauer, E. D.*; Cooley, J. C.*; Smith, J. L.*
Physical Review B, 81(5), p.054435_1 - 054435_5, 2010/02
被引用回数：5 パーセンタイル：26.3(Materials Science, Multidisciplinary)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.
Bi
Ni; A 
Bi NMR/NQR studyBaek, S.-H.*; Curro, N. J.*; Klimczuk, T.*; 酒井 宏典; Bauer, E. D.*; Ronning, F.*; Thompson, J. D.*
Physical Review B, 79(19), p.195120_1 - 195120_4, 2009/05
被引用回数：6 パーセンタイル：29.51(Materials Science, Multidisciplinary)We report Bi nuclear-magnetic-resonance and nuclear-quadrupole-resonance measurements on a single crystal of the Kondo insulator UBiNi. The Bi nuclear-spin-lattice relaxation rate (
) shows activated behavior and is well fit by a spin gap of 220 K. The Bi Knight shift (
) exhibits a strong temperature dependence arising from 
electrons, in which is negative at high temperatures and increases as the temperature is lowered. Below 50 K, shows a broad maximum and decreases slightly upon further cooling. Our data provide insight into the evolution of the hyperfine fields in a fully gapped Kondo insulator based on electron hybridization.
