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

DOI: 10.1103/PhysRevB.85.224102 DOI Help

Authors: R. Johnson (Clarendon Laboratory, University of Oxford, U.K.) , Chiu Tang (Diamond Light Source) , I. Evans (Department of Chemistry, Durham University, U.K.) , Stewart Bland (University of Durham) , D. Free (Department of Chemistry, Durham University, U.K.) , Thomas Beale (University of Durham) , Peter Hatton (University of Durham) , Laurence Bouchenoire (ESRF) , D. Prabhakaran (Clarencon Laboratory, University of Oxford, U.K.) , Andrew Boothroyd (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 85 (22)

State: Published (Approved)
Published: June 2012

Abstract: Through powder x-ray diffraction we have investigated the structural behavior of SmVO3 , 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 SmVO3 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 VO6 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.

Subject Areas: Chemistry

Instruments: I11-High Resolution Powder Diffraction

Added On: 12/07/2012 19:23

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