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NMR study of the semimetallic compound UCoGa$$_5$$

Kambe, Shinsaku  ; Sakai, Hironori   ; Kato, Harukazu*; Tokunaga, Yo  ; Fujimoto, Tatsuya*; Walstedt, R. E.*; Ikeda, Shugo; Maehira, Takahiro*; Haga, Yoshinori   ; Onuki, Yoshichika

We report NMR studies on a single crystal of UCoGa$$_5$$, which has the same tetragonal HoCoGa$$_5$$ (115) structure as the$$d$$-wave high-$$T_c$$ superconductor PuCoGa$$_5$$. The spin-lattice relaxation rate ($$1/T_1$$) in UCoGa$$_5$$ issmall comparing with those of other actinide 115 compounds. This fact is consistent with a semi-metallic nature of UCoGa$$_5$$ suggested by de Haas-van Alphen effect measurements and band calculations. From comparison of $$1/T_1$$ at crystallografically different Ga and Co sites and the static susceptibility, an existence of two bands with rather different characters is revealed.

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Percentile:31.47

Category:Materials Science, Multidisciplinary

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