Abstract
We have measured the elastic constants of YNi 2B 2C single crystals with T c=14.2 K down to 4.2 K. In the normal state, C 44 showed a softening below 65 K, and its magnitude defined as [ C 44(65 K)– C 44( T c)]/ C 44( T c) was approximately 6×10 −4. On the other hand, in the superconducting state, C 44 showed a hardening. This behavior was related to the softening of the acoustic Δ 4 mode, which is observed using inelastic neutron-scattering measurements. In addition, we discuss the pressure dependence of T c of this material from the change in the slope of the elastic constants at T c.
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