Journal ArticleDOI
Orbital Physics in Transition-Metal Oxides
Yoshinori Tokura,Naoto Nagaosa +1 more
Reads0
Chats0
TLDR
An overview is given here on this "orbital physics," which will be a key concept for the science and technology of correlated electrons.Abstract:
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 magnetoresistance. The orbital degree of freedom occasionally plays an important role in these phenomena, and its correlation and/or order-disorder transition causes a variety of phenomena through strong coupling with charge, spin, and lattice dynamics. An overview is given here on this "orbital physics," which will be a key concept for the science and technology of correlated electrons.read more
Citations
More filters
Journal ArticleDOI
Orbital-only models: ordering and excitations
TL;DR: In this paper, the authors consider orbital-only models in Mott insulators, where the orbital-orbital interactions are either due to Jahn-Teller distortions or due to the Kugel-Khomskii superexchange.
Journal ArticleDOI
Influence of the core hole on Kß emission following photoionization or orbital electron capture: a comparison using MnO and 55Fe2O3
TL;DR: In this paper, a crystal array spectrometer with an instrumental energy bandwidth of 0.7 eV was used to measure the fluorescence emission in MnO after photoionization and in Fe after radioactive electron capture decay from the K shell.
Journal ArticleDOI
A chemists view: Metal oxides with adaptive structures for thermoelectric applications
Gregor Kieslich,Giacomo Cerretti,Igor Veremchuk,Raphaël P. Hermann,Martin Panthöfer,Juri Grin,Wolfgang Tremel +6 more
TL;DR: In this article, the structural aspects of the crystallographic shear planes and the resulting thermoelectric properties of transition metal oxides with adaptive structures have been investigated with respect to their thermal properties.
Journal ArticleDOI
Raman study of spin and orbital order and excitations in perovskite-type R VO 3 ( R = La , Nd, and Y)
TL;DR: In this article, a quasi-one-dimensional orbital excitation corresponding to the exchange of the occupied orbital state on the neighboring sites, to be termed a two-orbiton in analogy to two-magnon in antiferromagnetically ordered states, was investigated.
Journal ArticleDOI
Interaction-induced chiral px ± ipy superfluid order of bosons in an optical lattice
TL;DR: In this paper, it was shown that bosons condensed in the second band of an optical chequerboard lattice might exhibit px ± i py order driven by the interaction in the local p-orbitals.
References
More filters
Journal ArticleDOI
Interaction between the d -Shells in the Transition Metals. II. Ferromagnetic Compounds of Manganese with Perovskite Structure
TL;DR: In this paper, it was shown that both electrical conduction and ferromagnetic coupling in these compounds arise from a double exchange process, and a quantitative relation was developed between electrical conductivity and the Ferromagnetic Curie temperature.
Journal ArticleDOI
Theory of the role of covalence in the perovskite-type manganites [La,M(II)]MnO3
TL;DR: In this article, the theory of double exchange was applied to perovskite-type manganites and detailed qualitative predictions about the magnetic lattice, the crystallographic lattice and the electrical resistivity were made.
Journal ArticleDOI
Stability of Polyatomic Molecules in Degenerate Electronic States. I. Orbital Degeneracy
H. A. Jahn,Edward Teller +1 more
TL;DR: In this paper, it was shown that if the total electronic state of orbital and spin motion is degenerate, then a non-linear configuration of the molecule will be unstable unless the degeneracy is the special twofold one (discussed by Kramers 1930) which can occur only when the molecule contains an odd number of electrons.
Journal ArticleDOI
Superexchange interaction and symmetry properties of electron orbitals
TL;DR: In this article, the sign of the superexchange interaction is closely connected with the symmetry of the electron orbitals and the cation orbital state when the cations are subject to the crystalline field arising from octahedral or tetrahedrally surrounding anions.