# Orbital physics in transition-metal oxides

@article{Tokura2000OrbitalPI,
title={Orbital physics in transition-metal oxides},
author={Tokura and Nagaosa},
journal={Science},
year={2000},
volume={288 5465},
pages={
462-8
}
}
• Published 21 April 2000
• Physics
• Science
An electron in a solid, that is, bound to or nearly localized on the specific atomic site, has three attributes: charge, spin, and orbital. The orbital represents the shape of the electron cloud in solid. In transition-metal oxides with anisotropic-shaped d-orbital electrons, the Coulomb interaction between the electrons (strong electron correlation effect) is of importance for understanding their metal-insulator transitions and properties such as high-temperature superconductivity and colossal…
1,656 Citations
Orbital degeneracy and strong correlations in transition-metal oxides generate spins and orbitals as low-energy degrees of freedom. Their interplay with both real-charge motion and virtual-charge
Rich properties of systems with strongly correlated electrons, such as transition metal (TM) oxides, is largely connected with an interplay of different degrees of freedom in them: charge, spin,
• Physics, Chemistry
Nature materials
• 2011
It is shown that it is possible to derive quantitative, spatially resolved orbital polarization profiles from soft-X-ray reflectivity data, without resorting to model calculations, and is sensitive enough to resolve differences of ~3% in the occupation of Ni e(g) orbitals in adjacent atomic layers of a LaNiO( 3)-LaAlO(3) superlattice.
• Physics
• 2011
We study the effects of temperature and magnetic field on a two-orbital Hubbard model within dynamical mean field theory. We focus on the quarter filled system, which is a special point in the phase
• Physics, Chemistry
Nature
• 2001
Experimental evidence for orbitons is reported in LaMnO3, using Raman scattering measurements and a model calculation of orbiton resonances which provides a good fit to the experimental data is performed.
• Physics, Chemistry
• 2017
The present review discusses different effects related to orbital degrees of freedom. Leaving aside such aspects as the superexchange mechanism of cooperative Jahn–Teller distortions and various
• Physics
Physical Review B
• 2019
Transition-metal oxides are a rich group of materials with very interesting physical properties that arise from the interplay of the charge, spin, orbital, and lattice degrees of freedom. One

## References

SHOWING 1-10 OF 58 REFERENCES

• Physics
• 1997
Spin correlations in metallic and insulating phases of V2O3 and its derivatives are investigated using magnetic neutron scattering. Metallic samples have incommensurate spin correlations varying
• Physics
• 1999
Roles of orbital and lattice degrees of freedom in strongly correlated systems are investigated to understand electronic properties of perovskite Mn oxides such as La_{1-x}Sr_{x}MnO_{3}. An extended
Recently, Jonker and Van Santen have found an empirical correlation between electrical conduction and ferromagnetism in certain compounds of manganese with perovskite structure. This observed
• Physics, Materials Science
• 1997
We study the effects of the degeneracy of the ${e}_{g}$ orbitals in perovskite transition-metal oxides in the limit of strong repulsive electron-electron interaction. The isospin field is introduced
• Physics
• 1998
The k-dependent electronic structure of the low temperature ferromagnetic state of La 1.2Sr1.8Mn2O7 was measured using angle-resolved photoemission spectroscopy and calculated using the local spin
• Physics
• 1997
In order to study nature of the electronic structures in manganites, the effective Hamiltonian is derived by taking the degeneracy of the ${\mathrm{e}}_{\mathrm{g}}$ orbitals and the strong electron
• Materials Science, Physics
Physical review. B, Condensed matter
• 1996
The electronic structure of the perovskite LaCoO3 for different spin states of Co ions was calculated in the local-density approximation LDA+U approach and shows that Co 3d states of t(2g) symmetry form narrow bands which could easily localize, while e(g) orbitals, due to their strong hybridization with the oxygen 2p states, form a broad sigma* band.
• Materials Science
Science
• 1999
Experimental data reviewed here by applying several techniques for manganites and other materials are consistent with a transition between the antiferromagnetic insulator state of the hole-undoped limit and the ferromagnetic metal at finite hole density through a mixed-phase process.
• Materials Science
Physical review. B, Condensed matter
• 1996
Single-particle excitation spectra calculated using Koopmans' theorem give an approximate but relevant picture on the electronic structure of the perovskite-type 3d transition-metal oxides.
• Physics
• 1999
We present the results of an LDA and LDA+U band structure study of the monoclinic and the corundum phases of V2O3 and argue that the most prominent (spin 1/2) models used to describe the