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Quadrupole effects in tetragonal crystals PrCu$$_2$$Si$$_2$$ and DyCu$$_2$$Si$$_2$$

Mitsumoto, Keisuke*; Goto, Saori*; Nemoto, Yuichi*; Akatsu, Mitsuhiro*; Goto, Terutaka*; Dung, N. D.*; Matsuda, Tatsuma; Haga, Yoshinori   ; Takeuchi, Tetsuya*; Sugiyama, Kiyohiro*; Settai, Rikio*; Onuki, Yoshichika

We have investigated quadrupole effects in tetragonal crystals of PrCu$$_2$$Si$$_2$$ and DyCu$$_2$$Si$$_2$$ by means of low-temperature ultrasonic measurements. The elastic constant C$$_{44}$$ of PrCu$$_2$$Si$$_2$$ exhibits pronounced softening below 70 K, which is described in terms of a quadrupole susceptibility for a doublet ground state.



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Category:Physics, Condensed Matter



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