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The ternary uranium compound UCu 2 Sn shows a ferro-quadrupolar transition at T Q ¼ 16 K originating from the ordering of the non-Kramers doublet À 5 ground state. To investigate the magnetic field-temperature phase diagram of the ferro-quadrupolar state in UCu 2 Sn, we measured elastic modulus C 66 at magnetic fields of up to 14 T. We found an anisotropic field dependence of T Q ðHÞ in H k ½ " 12 " 10, [0001], and ½01 " 10. We optimized the crystal electric field level scheme using C 66 under fields, magnetic susceptibility, and electronic entropy. The quadrupolar phase diagram is well reproduced by the obtained level scheme.

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The dysprosium indium compound DyIn 3 with the cubic AuCu 3-type structure shows an antiferromagnetic order at around T N = 20 K. We measured the elastic constants C 11 and C 44 in DyIn 3. The elastic softening toward T N and the Van-Vleck type behaviors below T N were observed. We analyzed the elastic properties by the crystal electric field theory corresponding the dipole-dipole interaction and the quadrupole-quadrupole interaction. The calculated results well represents the experimental behaviors.

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