Journal ArticleDOI
Orbital Physics in Transition-Metal Oxides
Yoshinori Tokura,Naoto Nagaosa +1 more
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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
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Magnetism of La0.625Sr0.375MnO3 under high pressure from first principles
Journal ArticleDOI
Magnetism ofLa0.625Sr0.375MnO3under high pressure from first principles
Journal ArticleDOI
Orbital order, metal-insulator transition, and magnetoresistance effect in the two-orbital Hubbard model
TL;DR: In this article, the effects of temperature and magnetic field on a two-orbital Hubbard model within dynamical mean field theory were studied, focusing on the quarter filled system, which is a special point in the phase diagram due to orbital degeneracy.
Journal ArticleDOI
Pressure-induced magnetic moment collapse and insulator-to-semimetal transition in BiCoO3
TL;DR: In this paper, the structural stability, magnetic properties and electronic structure of tetragonal BiCoO3 under pressure have been studied by first-principles density functional calculations.
Book ChapterDOI
Spin—Orbit—Topology, a triptych
Peter Lemmens,Patrice Millet +1 more
TL;DR: In this paper, transition metal oxides that realize s = 1/2 or s= 1 quantum spin systems with low dimensionality or geometrically restricted connectivity are often described using simple concepts.
References
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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.