Theoretical study on metal-insulator transition and superconductivity brought from ordering and fluctuation of multipolar moments

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In this project, we have done theoretical studies on unconventional ordering and fluctuation of local multipoles and conduction-electron states in rare-earth compounds. It was shown particularly that the nature of the charge order and the transport properties of conduction electrons in P_rR-u_4P_<12> are explained unifiedly by the pf hybridization model. Then, it was also unveiled that rich variety of ordering phenomena in other skutterudites such as the quadrupolar effect in the superconductor P_rO_s_4Sb_<12> and a complex magnetism in P_rF_e_4A_s_<12> are derived from an interplay of the pf and df hybridizations.