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One-dimensional confinement and enhanced Jahn-Teller instability in LaVO3.
Yukitoshi Motome1, Hitoshi Seo, Zhong Fang
1Tokura Spin SuperStructure Project (SSS), ERATO, Japan Science and Technology Corporation, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 4, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8562, Japan.
Physical Review Letters
|May 7, 2003
Summary
Quantum fluctuations in LaVO3 favor lattice distortions over orbital singlet formation due to strong one-dimensional anisotropy. This explains experimental findings on anisotropic optical spectra and transition temperatures.
Area of Science:
- Solid State Physics
- Quantum Mechanics
- Materials Science
Background:
- LaVO3 exhibits complex magnetic and orbital ordering phenomena.
- Understanding orbital degrees of freedom is crucial for its electronic properties.
Purpose of the Study:
- To theoretically investigate orbital ordering and quantum fluctuations in LaVO3.
- To explain the observed anisotropic optical spectra and transition temperatures.
Main Methods:
- Theoretical study of the effective Hamiltonian for orbital pseudospin.
- First-principle LDA+U calculations for Jahn-Teller coupling.
- Analysis of quantum fluctuations and their impact on lattice distortions.
Main Results:
- Strong one-dimensional anisotropy in the orbital pseudospin Hamiltonian was found.
- This anisotropy enhances instability towards lattice distortions.
- Orbital singlet formation is disfavored compared to lattice distortion.
Conclusions:
- The theoretical model successfully explains experimental observations in LaVO3.
- Lattice distortions play a key role in the orbital ordering of LaVO3.
- The interplay between spin and orbital ordering is elucidated.