Elastic anomalies of UGe

UGe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の超音波実験を4-120Kの範囲で行った。30Kの特性温度に着目した。3つの, , 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。モードの近辺の異常はブロードでが相転移温度ではないことが示唆される。とモードの弾性定数は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 in the temperature range 4-120 K at ambient pressure, focusing attention on the elastic behavior around the characteristic temperature = 30 K. In the elastic constants forthree modes , and , all modes show the hardening with a kink at the Curie temperature as decreasing temperatures. We found the elastic anomaly related to in the longitudinal mode. However, the anomaly around is very broad. Therefore, this result may suggest that is not related to a phase boundary of some second-order phase transition. On the other hand, no clear anomaly wasobserved around in the transverse and modes.