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Related Experiment Videos

Transition between orbital orderings in YVO3.

G R Blake1, T T Palstra, Y Ren

  • 1Solid State Chemistry Laboratory, Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.

Physical Review Letters
|December 12, 2001
PubMed
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A phase transition in Yttrium Vanadium Oxide (YVO3) at 77 K alters vanadium d orbital occupation and Jahn-Teller distortion. This orbital ordering persists until a 200 K structural transition, driven by increasing octahedral tilting.

Area of Science:

  • Solid-state physics
  • Materials science
  • Crystallography

Background:

  • Yttrium Vanadium Oxide (YVO3) exhibits complex phase transitions influenced by orbital ordering and structural distortions.
  • Jahn-Teller distortions are crucial in understanding the electronic and magnetic properties of transition metal oxides.

Purpose of the Study:

  • To investigate the changes in vanadium d orbital occupation during the 77 K phase transition in YVO3.
  • To determine the relationship between orbital ordering, magnetic ordering, and structural phase transitions in YVO3.
  • To elucidate the mechanism driving the transition between different orbital ordering states.

Main Methods:

  • Analysis of changes in the type of Jahn-Teller distortion at the 77 K phase transition.
  • Tracking the persistence of orbital ordering above the magnetic ordering temperature (116 K) and up to the second structural phase transition (200 K).

Related Experiment Videos

  • Investigating the role of octahedral tilting in mediating the transition between orbital orderings.

    • Main Results:

    • A change in ordered occupation of vanadium d orbitals was observed at the 77 K phase transition in YVO3.
    • The Jahn-Teller distortion type changes at 77 K, indicating a modification in orbital ordering.
    • Orbital ordering remains intact above the magnetic ordering temperature (116 K) and persists until a structural phase transition at 200 K.
    • Increasing octahedral tilting with decreasing temperature was identified as the cause for the transition between orbital orderings.

    Conclusions:

    • The 77 K phase transition in YVO3 is characterized by a significant change in vanadium d orbital ordering and Jahn-Teller distortion.
    • Orbital ordering in YVO3 is robust, surviving magnetic ordering and extending to higher temperatures.
    • Octahedral tilting is the key factor driving the observed transitions in orbital ordering within YVO3.