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Elastic anomalies of UGe$$_2$$

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

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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