Abstract
We performed ultrasonic measurements for HoNi 2B 2C and Ho 0.75Y 0.25Ni 2B 2C single crystals between 1.7 and 80 K under various magnetic field. In zero field, C 66 for HoNi 2B 2C decreases continuously on lowering temperature in a wide temperature region below 80 K , and showed a discontinuous softening and recovering at 5.5 and 3.8 K , respectively. In contrast, ( C 11− C 12)/2 remained almost constant in the whole temperature region. In the field applied along the b( a)-axis, the softening of C 66 was largely suppressed, which suggests that the softening is magnetic in origin. A similar softening of C 66 was also observed for Ho 0.75Y 0.25Ni 2B 2C.
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