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Hyperfine interactions in the itinerant system UFeGa$$_{5}$$

遍歴系UFeGa$$_{5}$$の超微細相互作用

神戸 振作; 酒井 宏典; 徳永 陽; 中堂 博之; 安岡 弘志; 松田 達磨; 芳賀 芳範; 池田 修悟; 中村 彰夫; 山本 悦嗣; 青木 大*; 本間 佳哉*; 塩川 佳伸*; 大貫 惇睦*

Kambe, Shinsaku; Sakai, Hironori; Tokunaga, Yo; Chudo, Hiroyuki; Yasuoka, Hiroshi; Matsuda, Tatsuma; Haga, Yoshinori; Ikeda, Shugo; Nakamura, Akio; Yamamoto, Etsuji; Aoki, Dai*; Homma, Yoshiya*; Shiokawa, Yoshinobu*; Onuki, Yoshichika*

5f電子系では新奇な超伝導や磁性が電子相関や軌道縮退の効果で低温で見られる。例えば、われわれはNpPd$$_5$$Al$$_2$$($$T_c$$=5K)とPuRhGa$$_5$$($$T_c$$=9K)を各種測定手段で研究した。また、新奇超伝導と磁気揺らぎの関係についても考察する。それ以外には、二酸化アクチノイドAnO$$_2$$(An; U, Np, Pu, Am)も大変興味深い。$$^{17}$$O-NMRを用いて、UO$$_2$$の双極子+四極子,NpO$$_2$$の四極子+八極子を解明した。一方、PuO$$_2$$は非磁性である。このように5f電子系は低温物理学の最後の未踏領域として、魅力ある分野であるのでその展望も述べる。

In 5f-electron systems, exotic magnetism and unconventional superconductivity appear at low temperatures owing to strong electron correlations and orbital degeneracy. For example, we have investigated the unconventional superconducting states of recently synthesized NpPd$$_5$$Al$$_2$$ ($$T_c$$=5K) and PuRhGa$$_5$$ ($$T_c$$=9K) in terms of both macroscopic (staticsusceptibility, specific heat, resistivity) and microscopic (NMR) probes. The relation between magnetic fluctuations and unconventional superconductivity in f-electron systems is also discussed. Another exciting topic concerns the series AnO$$_2$$ (An; U, Np, Pu, Am). Besides the importance of AnO$$_2$$ as a nuclear fuel, the magnetic properties of these compounds at low temperatures are particularly interesting. On the basis of $$^{17}$$O-NMR studies, multipolar ordered states have been identified in UO$$_2$$ (dipolar + quadrupolar ordering) and NpO$$_2$$ (quadrupolar + octupolar ordering), in contrast with the non-magnetic ground state of PuO$$_2$$.

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パーセンタイル:88.43

分野:Materials Science, Multidisciplinary

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