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Superexchange interaction in orbitally fluctuating RVO3.

J-S Zhou¹, J B Goodenough, J-Q Yan

¹Texas Materials Institute, University of Texas at Austin, Austin, Texas 78712, USA.

Physical Review Letters

|November 13, 2007

Summary

Researchers studied RVO3 perovskites, finding pressure influences magnetic ordering by competing orbital phases. This competition, affected by crystal structure, enhances magnetic critical fluctuations and ordering temperatures.

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Area of Science:

Condensed Matter Physics
Materials Science
Magnetism

Background:

RVO3 perovskites exhibit complex orbital and magnetic ordering.
The interplay between orbital degrees of freedom and magnetic structure is crucial.
Understanding these interactions is key to designing novel magnetic materials.

Purpose of the Study:

To investigate the influence of pressure and magnetic fields on the orbital and magnetic ordering temperatures of RVO3 perovskites.
To elucidate the competition between different magnetic orbitally ordered phases.
To understand the role of crystal structure distortions in biasing this competition.

Main Methods:

Experimental measurements of RVO3 perovskites under varying pressure and magnetic field conditions.
Analysis of changes in orbital and magnetic ordering temperatures.
Investigation of the localized {3}T{1g} ground state of the V(3+) ion and its e-orbital component.

Main Results:

A competition between two magnetic orbitally ordered phases with opposing e-orbital preferences was identified.
The VO{6/2} site distortion in the orthorhombic structure biases this competition.
A significant enhancement of the Néel temperature (T{N}) with increasing pressure was observed.
Enhanced orbital critical fluctuations were linked to this pressure-induced competition.

Conclusions:

Pressure and crystal field effects critically influence the delicate balance of competing orbital and magnetic phases in RVO3 perovskites.
The observed enhancement of T{N} and orbital fluctuations highlights a unique pressure-induced tuning mechanism.
These findings provide insights into the fundamental physics governing orbital-lattice-magnetic interactions in perovskite materials.