We report high-magnetic-field thermal expansion and magnetostriction results on $\mathrm{Ce}\mathrm{Rh}{\mathrm{In}}_5$ single crystals. Several phase transitions, both first and second order, are observed when the field is applied perpendicular to the crystallographic $c$ axis. The magnetic field dependence of the thermal-expansion coefficient above $15\mathrm{K}$, where the magnetic correlations are negligible, can be explained supposing an almost pure $\mid \pm 5∕2⟩$ ground state doublet, in apparent contradiction with neutron scattering experiments. Although the spin-lattice interaction is relevant in this compound, the effect of the magnetic correlations on the elastic properties is relatively weak, as revealed by resonant ultrasound spectroscopy experiments.

• Received 10 November 2004

DOI:https://doi.org/10.1103/PhysRevB.72.012407