| AVS 64th International Symposium & Exhibition | |
| Actinides and Rare Earths Focus Topic | Monday Sessions |
| Session AC+MI+SA+SU-MoM |
| Session: | Magnetism, Complexity, and Superconductivity in the Actinides and Rare Earths |
| Presenter: | Yoshinori Haga, Japan Atomic Energy Agency, Japan |
| Correspondent: | Click to Email |
Physical properties of actinides compounds are mainly dominated by the 5f electrons behavior. The spatial extent of the 5f wave function and resulting hybridization with the neighboring atoms lead to itinerant characters. On the other hand, well isolated 5f electrons carry magnetic moment. Competition between those two characteristics often bring about peculiar electronic properties. Among a series of actinides compounds, so-called 115 compounds crystallizing in the tetragonal HoCoGa5-type structure have extensively been studied because of unusual correlated electronic states, including heavy effective mass of conduction electrons, magnetic orderings and heavy fermion superconductivity. Those compounds are also good cases to study electronic transport properties in detail because of availability of extremely high quality samples. Among them, we discuss electronic properties of URhX5 (X = Ga and In). While URhIn5 orders antiferromagnetically at fairly high tempearture 98 K, isostructural and formally isoelectronic analogue URhGa5 is a nonmagnetic semimetal[1,2,3]. Detailed transport measurements as well as the de Haas-van Alphen experiment revealed Fermi surface characteristics. We discuss origin of magnetism of uranium 5f electrons and its relationship between superconductivity realized in Pu-analogues.
[1] Y. Matsumoto et al., Phys. Rev. B 88, 045120 (2013).
[2] S. Ikeda et al., Physica B 359-361, 1039 (2005).
[3] Y. Matsumoto et al, JPS Conf. Proc. 3, 011097 (2014).