Department of Applied Physics, Nagoya University, Chikusa-ku, Nagoya 464, Japan;Department of Physics, University of Tsukuba, Sakuramura, Ibaragi 300-31, Japan;Electrotechnical Laboratory, Tanashi, Tokyo 188, Japan
Abstract:
The anomalous behavior of the specific heat appears around 35 and 65 K. The 65 K-anomaly seems to be related to the ferroelastic softening of c66. At 120 K no anomaly appears not only in the normal sample but also in the dehydrated sample.