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

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*

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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Category:Materials Science, Multidisciplinary

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