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Report No.

NQR measurements of UTGa$$_{5}$$

Kato, Harukazu; Sakai, Hironori; Kambe, Shinsaku  ; Walstedt, R. E.; Tokiwa, Yoshifumi; Onuki, Yoshichika

We performed $$^{69,71}$$Ga-NMR/NQR studies for UPtGa$$_{5}$$, which is a 5$$f$$-itinerant antiferromagnets with Neel temperature $$T_{N}$$ = 26 K and an electronic specific coefficient $$gamma$$ = 57 mJ/mol K$$^{2}$$. From the NMR spectrum in the paramagnetic temperature region, the hyperfine coupling constants $$A_{hf}^{para}$$ in the paramagnetic state have been evaluated. The magnitude of the transferred field has been evaluated from the zero-applied-field spectrum, yielding a value for the hyperfine coupling constant $$A_{hf}^{AF}$$ in the antiferromagnetic state. The estimated value of $$A_{hf}^{AF}$$ is an order of magnitude larger than that of $$A_{hf}^{para}$$. This implies the existence of a long-ranged hyperfine interaction path. The mechanism of the hyperfine interaction will be discussed in terms of RKKY interactions.



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