Fermi surface of ThRuSi as a reference to the strongly correlated isostructural metals investigated by quantum oscillations

Matsumoto, Yuji*; Haga, Yoshinori   ; Tateiwa, Naoyuki   ; Aoki, Haruyoshi*; Kimura, Noriaki*; Yamamura, Tomoo*; Yamamoto, Etsuji  ; Matsuda, Tatsuma*; Fisk, Z.*; Yamagami, Hiroshi*

dHvA oscillations were detected on an actinide compound ThRuSi which is regarded as a reference to strongly correlated electron systems URuSi and CeRuSi. Observed Fermi surfaces well coincides with the band structure calculations, as well as experimentally obtained ones for a heavy fermion compound CeRuSi. On the other hand, Fermi surfaces of URuSi have significantly different characteristics, suggesting an itinerant ground state of 5f electrons.