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Through powder x-ray diffraction we have investigated the structural behaviorof SmVO3, in which orbital and magnetic degrees of freedom are believed to beclosely coupled to the crystal lattice. We have found, contrary to previousreports, that SmVO3 exists in a single, monoclinic, phase below 200 K. Theassociated crystallographic distortion is then stabilized through themagnetostriction that occurs below 134 K. The crystal structure has beenrefined using synchrotron x-ray powder diffraction data measured throughout thestructural phase diagram, showing a substantial Jahn-Teller distortion of theVO6 octahedra in the monoclinic phase, compatible with the expected G-typeorbital order. Changes in the vanadium ion crystal field due to the structuraland magnetic transitions have then been probed by resonant x-ray diffraction.

An x-ray diffraction study of the temperature-induced structural phase transitions in SmVO3