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Journal Articles

Heavy fermion state and quantum criticality

Onuki, Yoshichika; Settai, Rikio*; Honda, Fuminori*; Dung, N. D.*; Ishikura, Tatsuro*; Takeuchi, Tetsuya*; Matsuda, Tatsuma; Tateiwa, Naoyuki; Nakamura, Akio; Yamamoto, Etsuji; et al.

Physica B; Condensed Matter, 405(9), p.2194 - 2199, 2010/05

https://doi.org/10.1016/j.physb.2010.02.006
 Times Cited Count：1 Percentile：6.48(Physics, Condensed Matter)

Journal Articles

Fermi surface properties of YbCu$$_2$$Si$$_2$$

Matsuda, Tatsuma; Dung, N. D.*; Haga, Yoshinori; Ikeda, Shugo*; Yamamoto, Etsuji; Ishikura, Tatsuro*; Endo, Toyoaki*; Takeuchi, Tetsuya*; Settai, Rikio*; Onuki, Yoshichika

Physica Status Solidi (B), 247(3), p.757 - 759, 2010/03

https://doi.org/10.1002/pssb.200983027
 Times Cited Count：2 Percentile：12.12(Physics, Condensed Matter)

We succeeded in growing high-quality single crystals of a heavy electron compound YbCu$$_2$$Si$$_2$$. The electronic specific heat coefficient $$gamma$$ is determined to be 150 mJ/K$$^2cdot$$mol, which is consistent with the $$A$$ value of the electrical resistivity from Kadowaki-Woods relation. We succeeded in observing the de Haas-van Alphen (dHvA) oscillations. The dHvA frequencies and large cyclotron effective masses in YbCu$$_2$$Si$$_2$$ are highly different from those in a non-4$$f$$ reference compound YCu$$_2$$Si$$_2$$. From these dHvA results, the heavy electron state of YbCu$$_2$$Si$$_2$$ is characterized by the large contribution of 4$$f$$-electrons to the volume of the Fermi surface and also to the strong enhancement of effective mass caused by the spin fluctuations.

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