Abstract
Properties of lanthanide and actinide intermetallics are extremely interesting both for applications and fundamental research. The impetus to start fundamental research on f-electron materials doubtlessly was the determination of the ferromagnetic properties of UH3 and UD3 by the research group of the Institute of Low Temperature and Structure Research in Wroclaw and detection of the mixed valence state in samarium monochalcogenides at A. F. Ioffe Physicotechnical Institute in Leningrad (at that time). Since then, the phenomena of the mixed valence, heavy-fermion, state as well as complicated magnetic structures have been under intensive investigation in numerous laboratories all over the world. As examples, the exotic magnetic structures of CeSb and UNi4B are described. Then the problems of the heavy-fermion state existing in UBe13 and UCu4+x Al8−x are presented. Next, the non-Fermi-liquid behavior appearing due to magnetic instability is discussed. Finally, some perspective for further research is proposed.
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