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NMR study of magnetic fluctuations in 115 actinide compounds

NMRによるアクチノイド115化合物の磁気揺らぎ

神戸 振作  ; 酒井 宏典   ; 徳永 陽  ; 加藤 治一; 藤本 達也; Walstedt, R. E.*; 池田 修悟; 松田 達磨; 芳賀 芳範   ; 青木 大*; 本間 佳哉*; 塩川 佳伸*; 大貫 惇睦*

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*

色々な基底状態を持つ5f-115化合物UFeGa$$_{5}$$常磁性,UPtGa$$_{5}$$, NpCoGa$$_{5}$$, NpFeGa$$_{5}$$反強磁性,PuRhGa$$_{5}$$超伝導のNMRを測定し、局所的磁気揺らぎの温度異存を常磁性状態でc軸平行と垂直で見積もった。磁気異方性はすべての化合物で見られた。これは強いLS結合によるもので、揺らぎが等方的な3d系の銅系高温超伝導体とははっきり異なっている。超伝導体PuRhGa$$_{5}$$の揺らぎはXY型が強いことがわかった。そのエネルギーは10meV程度で$$T$$$$_{rm c}$$1K程度の重い電子系(1meV)と高温超伝導体($$T$$$$_{rm c}$$100Kで100meV)のちょうど中間にあることがわかった。基底状態と磁気揺らぎの関係について議論する。

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 $$T$$$$_{rm c}$$1K) and high $$T$$$$_{rm c}$$ cuprates (102meV for $$T$$$$_{rm c}$$100K). The relation between the magnetic fluctuation properties and the ground states will be discussed.

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