Elastic Anomalies Associated with Possible Charge Order and Other Transitions in Mixed-valent YbPd

Y. Nakanishi；T. Kamiyama；K. Ito；M. Nakamura；M. Sugishima；A. Mitsuda；H. Wada；M. Yoshizawa

Chinese Journal of Physics

49卷1期（2011 / 02 / 01）

462 - 470

英文

Elastic anomalies associated with possible charge order and other phase transitions in a mixed-valent compound YbPd were investigated by ultrasonic measurements. A pronounced elastic anomaly was observed at a possible charge-ordering temperature of 125 K, accompanied with a distinct hysteresis. On the other hand, a slight but clear elastic anomaly was observed at other phase transitions at 1.9 K and 105 K. We argue that the data can be described in terms of 4f low-lying level scheme of Yb ions under a crystalline electric field effect and a possible charge ordering although Yb seems to go into a mixed-valent state in YbPd.

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