Elastic anomaly of UCu2Sn in the magnetic fields

Abstract Ternary uranium compound UCu 2 Sn undergoes a quadrupolar ordering at around 16 K, where the transverse elastic modulus C 66 shows a remarkable softening. To clarify an effect of magnetic fields on the quadrupolar transition, temperature dependence of C 66 was measured in the various fields along the c -axis. We found that the transition temperature decreases monotonically with increasing the strength of the field and then plotted a quadrupolar phase diagram of this compound for the first time.