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Evidence for electronic phase separation between orbital orderings in SmVO3
M H Sage1, G R Blake, G J Nieuwenhuys
1Solid State Chemistry Laboratory, Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
Physical Review Letters
|February 21, 2006
Summary
Orbital orderings in samarium vanadate (SmVO3) coexist due to a spin ordering transition. This phenomenon arises from samarium
Area of Science:
- Solid State Physics
- Materials Science
- Crystallography
Background:
- Orbital ordering in transition metal oxides influences electronic and magnetic properties.
- Samarium vanadate (SmVO3) exhibits complex phase transitions.
- Understanding phase coexistence is crucial for materials design.
Purpose of the Study:
- To investigate the coexistence of different orbital ordering symmetries in SmVO3.
- To elucidate the driving mechanism behind this phase coexistence.
Main Methods:
- High-resolution x-ray powder diffraction was employed.
- Temperature-dependent measurements were conducted to observe phase transitions.
Main Results:
- Evidence for phase coexistence of orbital orderings with different symmetries was found.
- Phase coexistence is triggered by antiferromagnetic ordering of vanadium spins around 130 K.
- This occurs below an initial orbital ordering transition near 200 K.
Conclusions:
- The intermediate ionic size of samarium, coupled with exchange striction at vanadium spin ordering, drives the phase coexistence.
- This finding provides insight into the interplay between orbital, spin, and lattice degrees of freedom in SmVO3.
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