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Localized 5$$f$$ antiferromagnetism in cubic UIn$$_3$$; $$^{115}$$In-NMR/NQR study

Sakai, Hironori   ; Kambe, Shinsaku  ; Tokunaga, Yo  ; Chudo, Hiroyuki ; Tokiwa, Yoshifumi*; Aoki, Dai*; Haga, Yoshinori   ; Onuki, Yoshichika; Yasuoka, Hiroshi

$$^{115}$$In nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements have been performed on an antiferromagnet UIn$$_3$$ with the cubic AuCu$$_3$$-type structure. Under zero field, the observation of the NQR spectrum has led to an estimated $$nu_{rm Q}$$ of 11.8 MHz at 90 K. The temperature variation of the NQR relaxation rates ($$1/T_1$$) far above the N${'e}$el temperature $$T_{rm N}$$=88 K approaches a constant value, which indicates a localized nature for the $$5f$$-electrons in this system. On the other hand, in the antiferromagnetically ordered state, we propose that the most plausible direction of antiferromagnetic U moments may be $$langle 110rangle$$ among the possible orientations of $$langle 100rangle$$, $$langle 110rangle$$, or $$langle 111rangle$$.

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Category:Materials Science, Multidisciplinary

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