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Enhancement of the cyclotron effective mass in U$$_{0.03}$$Th$$_{0.97}$$Ru$$_2$$Si$$_2$$

Haga, Yoshinori   ; Matsumoto, Yuji*; Tateiwa, Naoyuki   ; Yamamoto, Etsuji  ; Kimura, Noriaki*; Yamamura, Tomoo*; Fisk, Z.

We investigate the modification of the electronic state of ThRu$$_2$$Si$$_2$$ upon replacing non magnetic Th by U. We successfully observed the quantum oscillation signals from the Fermi surface. The observed Fermi surfaces did not show a significant change in size for the U$$_{0.03}$$Th$$_{0.97}$$Ru$$_2$$Si$$_2$$ sample. However the enhancement of the cyclotron effective mass demonstrates the hybridization of the 5$$f$$ states with the conduction bands.



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