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Journal Articles

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

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

Acta Physica Polonica B, 34(2), p.1063 - 1066, 2003/09

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.

Journal Articles

Ga nuclear magnetic resonance study of UTGa$$_{5}$$(T=Ni, Pt)

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

Journal of Physics; Condensed Matter, 15(28), p.S2001 - S2005, 2003/07

 Times Cited Count:4 Percentile:26.37(Physics, Condensed Matter)

UPtGa$$_{5}$$ and UNiGa$$_{5}$$ are 5$$f$$-itinerant antiferromagnets with N$'{e}$el temperature $$T_{N}$$ = 26 K (Pt), 86 K (Ni). Remarkably, although the two compounds show almost identical Fermi surface properties in the paramagnetic state, recent neutron scattering experiments reveal that UPtGa$$_{5}$$ and UNiGa$$_{5}$$ are quite different in magnetic structure below $$T_{N}$$. In the microscopic viewpoint, we have carried out $$^{69,71}$$Ga NMR/NQR measurements for the both coumpounds. We have suceeded in separating the temperature independent term and the Curie-like-temperature-dependent term of the Knight shift $$K$$. This should be a good starting point in considering the magnetism of this system.

Journal Articles

Neutron diffractioin study of 5$${it f}$$ itinerant antiferromagnet UPtGa$$_{5}$$ and UNiGa$$_{5}$$

Kaneko, Koji; Metoki, Naoto; Lander, G. H.*; Bernhoeft, N.*; Tokiwa, Yoshifumi; Haga, Yoshinori; Onuki, Yoshichika; Ishii, Yoshinobu

Physica B; Condensed Matter, 329-333(1-4), p.510 - 511, 2003/05

 Times Cited Count:3 Percentile:20.85(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Ga and Pt NMR study of UPtGa$$_{5}$$

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

Journal of Physics and Chemistry of Solids, 63(6-8), p.1197 - 1200, 2002/06

 Times Cited Count:11 Percentile:49.99(Chemistry, Multidisciplinary)

no abstracts in English

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