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Magnetoelastic effect in R 2 Ni 2 In (R = Tb, Tm), associated with the antiferro- to paramagnetic phase transition at the Néel temperature T N  equal to 40 K (R = Tb) or 4.8 K (R = Tm), has been investigated by neutron powder diffraction. Rietveld refinement reveals that the orthorhombic crystal structure, reported at room temperature, is stable down to low temperatures, including magnetically ordered state. Based on the diffraction data, thermal evolution of the lattice parameters  a ,  b  and  c  and the unit cell volume  V  have been determined. Both the lattice parameters as well as the unit cell volume show distinct jumps in the vicinity of the respective Néel temperatures, indicating presence of the magnetoelastic effect. The values of the lattice strains Δ a , Δ b , Δ c  and change of the unit cell volume Δ V , associated with the antiferro- to paramagnetic phase transition, are reported.

Magnetoelastic effect in R 2 Ni 2 In (R = Tb and Tm) investigated by neutron powder diffraction