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$$^{235}$$U nuclear relaxation rates in an itinerant antiferromagnet USb$$_2$$

遍歴反強磁性体USb$$_2$$における$$^{235}$$U核磁気緩和率

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

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

$$^{235}$$U nuclear spin-lattice ($$T_1^{-1}$$) and spin-spin ($$T_2^{-1}$$) relaxation rates in the itinerant antiferromagnet USb$$_2$$ are reported as a function of temperature in zero field. The heating effect from the intense rf pulses that are necessary for the $$^{235}$$U NMR results in unusual complex thermal recovery of the nuclear magnetization which does not allow measuring $$T_1^{-1}$$ directly. By implementing an indirect method, however, we successfully extracted $$T_1^{-1}$$ of the $$^{235}$$U. We find that the temperature dependence of $$T_1^{-1}$$ for both $$^{235}$$U and $$^{121}$$Sb follows the power law ($$propto T^{n}$$) with the small exponent $$n$$ = 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.

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パーセンタイル:28.15

分野:Materials Science, Multidisciplinary

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