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Elastic anomalies of UGe$$_2$$

UGe$$_2$$の弾性的性質

桑原 慶太郎*; 酒井 祟史*; 神木 正史*; 芳賀 芳範 ; 大貫 惇睦

Kuwahara, Keitaro*; Sakai, Takashi*; Kogi, Masafumi*; Haga, Yoshinori; Onuki, Yoshichika

UGe$$_2$$の超音波実験を4-120Kの範囲で行った。30Kの特性温度$$T^{*}$$に着目した。3つの$$c$$$$_{11}$$, $$c$$$$_{55}$$, $$c$$$$_{66}$$モードは温度降下とともに増大し、強磁性転移温度で異常を示した。$$c$$$$_{11}$$モードの$$T^{*}$$近辺の異常はブロードで$$T^{*}$$が相転移温度ではないことが示唆される。$$c$$$$_{55}$$$$c$$$$_{66}$$モードの弾性定数は$$T^{*}$$で何の異常も示さなかった。

We have performed the ultrasonic sound velocity measurement on the single crystal of UGe$$_2$$ in the temperature range 4-120 K at ambient pressure, focusing attention on the elastic behavior around the characteristic temperature $$T^{*}$$ = 30 K. In the elastic constants forthree modes $$c$$$$_{11}$$, $$c$$$$_{55}$$ and $$c$$$$_{66}$$, all modes show the hardening with a kink at the Curie temperature as decreasing temperatures. We found the elastic anomaly related to $$T^{*}$$ in the longitudinal $$c$$$$_{11}$$ mode. However, the anomaly around $$T^{*}$$ is very broad. Therefore, this result may suggest that $$T^{*}$$ is not related to a phase boundary of some second-order phase transition. On the other hand, no clear anomaly wasobserved around $$T^{*}$$ in the transverse $$c$$$$_{55}$$ and $$c$$$$_{66}$$ modes.

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