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Ga NMR study of UGa$$_{3}$$; Antiferromagnetically ordered state

Kambe, Shinsaku ; Walstedt, R. E.; Sakai, Hironori; Tokunaga, Yo ; Matsuda, Tatsuma; Haga, Yoshinori ; Onuki, Yoshichika

Temperature dependence of the spin-lattice relaxation time ($$T_{1}$$) at Ga site are measured for the paramagnetic and antiferromagnetically (AFM) ordered states of UGa$$_{3}$$($$T_{N}=66K$$). Clear minimaum of $$T_1$$ has been observed at $$sim62K$$ in addition to a minimun at $$T_N$$, indicating that second order phase transtion occures at both temperatures. Based on a comparison between $$T_1$$ of $$^{69}$$Ga and $$^{71}$$Ga nucleai, the enhanced fluctuations at both temparature are magnetic. The origin of the transitions are discussed.

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Category:Materials Science, Multidisciplinary

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