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A detailed analysis of the crystal structure in RETiO3 with RE = La, Nd, Sm,Gd, and Y reveals an intrinsic coupling between orbital degrees of freedom andthe lattice which cannot be fully attributed to the structural deformationarising from bond-length mismatch. The TiO6 octahedra in this series are allirregular with the shape of the distortion depending on the RE ionic radius.These octahedron distortions vary more strongly with temperature than the tiltand rotation angles. Around the Ti magnetic ordering all compounds exhibitstrong anomalies in the thermal-expansion coefficients, these anomalies exhibitopposite signs for the antiferromagnetic and ferromagnetic compounds.Furthermore the strongest effects are observed in the materials close to themagnetic cross-over from antiferromagnetic to ferromagnetic order

physical review. b, condensed matter and materials physics

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Magnetoelastic coupling inRTiO3(R=La,Nd