NMR study of magnetic fluctuations in 115 actinide compounds

Kambe, Shinsaku ; Sakai, Hironori ; Tokunaga, Yo ; Kato, Harukazu; Fujimoto, Tatsuya; Walstedt, R. E.*; Ikeda, Shugo; Matsuda, Tatsuma; Haga, Yoshinori ; Aoki, Dai*; Homma, Yoshiya*; Shiokawa, Yoshinobu*; Onuki, Yoshichika*

performed NMR measurements in 5f-115 compounds with various ground states [UFeGa $_{5}$ (Paramagnet), UPtGa $_{5}$ , NpCoGa $_{5}$ , NpFeGa $_{5}$ (Antiferromagnet) and PuRhGa $_{5}$ (Superconductor)], and evaluated the T-dependence of the local (actinide site) magnetic fluctuation energies (//c and c) in the paramagnetic states. An anisotropy in the magnetic fluctuations is observed in all compounds due to the strong LS coupling, in contrast to 3d-high Tc cuprates which have isotropic magnetic fluctuations at Cu sites. It is remarkable that the XY-type magnetic anisotropy is strong in PuRhGa $_{5}$ comparing with the non-superconducting 5f-115 compounds. The fluctuation energy in PuRhGa $_{5}$ is of the order of 10meV which is between of heavy fermion superconductors (1meV for $_{rm c}$ 1K) and high $_{rm c}$ cuprates (102meV for $_{rm c}$ 100K). The relation between the magnetic fluctuation properties and the ground states will be discussed.

Language	:	English
Journal	:	Journal of Magnetism and Magnetic Materials
Volume	:	310
Number	:	2, Part1
Pages	:	p.176 - 181
Publication Year/Month	:	2007/03
Meeting title	:	17th International Conference on Magnetism (ICM 2006)
Held date	:	2006/08
Location (city)	:	Kyoto
Location (country)	:	Japan
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Keywords	:	no keyword
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Registration No. : BB20060681
JAEA Abstracts No. : 35001163
Paper Submission No. : 2750

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