Abstract
Through powder x-ray diffraction we have investigated the structural behavior of SmVO${}_{3}$, in which orbital and magnetic degrees of freedom are believed to be closely coupled to the crystal lattice. We have found, contrary to previous reports, that SmVO${}_{3}$ exists in a single, monoclinic phase below 200 K. The associated crystallographic distortion is then stabilized through the magnetostriction that occurs below 134 K. The crystal structure has been refined using synchrotron x-ray powder diffraction data measured throughout the structural phase diagram, showing a substantial Jahn-Teller distortion of the VO${}_{6}$ octahedra in the monoclinic phase, compatible with the expected $G$-type orbital order. Changes in the vanadium ion crystal field due to the structural and magnetic transitions have then been probed by resonant x-ray diffraction.
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