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
Citations
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Interplay between charge and antiferromagnetic ordering in Bi0.6−xPrxCa0.4MnO3 (0≤x≤0.6) perovskite manganite
TL;DR: In this article, it has been proposed that the local lattice distortion induced due to size mismatch between the A-site cations and 6s2 character of Bi3+ lone pair electron is responsible for the observed magnetic and electrical properties.
Dissertation
Electronic and magnetic properties of transition metal compounds: An x-ray spectroscopic study
Journal ArticleDOI
Direct Visualization of Orbital Flipping in Volborthite by Charge Density Analysis Using Detwinned Data
Kento Sugawara,Kunihisa Sugimoto,Tatsuya Fujii,Takafumi Higuchi,Naoyuki Katayama,Yoshihiko Okamoto,Hiroshi Sawa +6 more
TL;DR: In this paper, the authors demonstrated that the water molecules in volborthite can be located by hydrogen bonding in cavities that consist of Kagome lattice layers of CuO4(OH)2 and pillars of V2O7.
Journal ArticleDOI
Phase diagrams and magnetic properties of CaCu 3 Fe 2 Os 2 O 12 quadruple perovskite: Monte Carlo study
TL;DR: In this paper, a Monte Carlo Simulation (MCS) has been used to study the quadruple perovskite oxide CaCu 3 Fe 2 Os 2 O 12, where the system has been conceived as a mixture of atoms with the magnetic moments.
Journal ArticleDOI
Crystal chemistry and formation mechanism of tetragonal MgTi2O4
TL;DR: In this paper, symmetry methods of second-order phase transitions are used to clarify the structural mechanism of the transition from the cubic (Fd3m) to the tetragonal (P41212) phase of magnesium titanite.
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.