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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Hyperfine interaction measurements in LaCrO 3 and LaFeO 3 perovskites using perturbed angular correlation spectroscopy
R. Dogra,A. C. Junqueira,R. N. Saxena,Artur W. Carbonari,José Mestnik-Filho,Mauricio Moralles +5 more
TL;DR: The perturbed angular correlation (PAC) technique was used to study the hyperfine interactions in the antiferromagnetic and paramagnetic regions of the distorted perovskites in this paper.
Journal ArticleDOI
Faulting induced by precipitation of water at grain boundaries in hot subducting oceanic crust
TL;DR: It is shown that at such pressures and temperatures, eclogite lacking hydrous phases but with significant hydroxyl incorporated as defects in pyroxene and garnet develops a faulting instability associated with precipitation of water at grain boundaries and the production of very small amounts of melt.
Journal ArticleDOI
Orbital Effects in Solids: Basics, Recent Progress, and Opportunities
TL;DR: The main phenomena in the physics of transition metal compounds are the reduction of effective dimensionality in many systems with orbital degrees of freedom due to the directional character of orbitals, with the concomitant appearance of some instabilities that lead in particular to the formation of dimers, trimers, and similar clusters in a material.
Journal ArticleDOI
Principles determining the activity of magnetic oxides for electron transfer reactions
TL;DR: In this article, the authors derive the guidelines of the ferromagnetic exchange interactions, an extension of the Goodenough-Kanamori rules, to electrocatalytic interfaces, which anticipates minimum Gibbs energy of activation.
Journal ArticleDOI
Emerging core-shell nanostructured catalysts of transition metal encapsulated by two-dimensional carbon materials for electrochemical applications
Duy Thanh Tran,Tolendra Kshetri,Nguyen Dinh Chuong,Jagadis Gautam,Hoa Van Hien,Le Huu Tuan,Nam Hoon Kim,Joong Hee Lee +7 more
TL;DR: In this paper, the transition metal-based catalysts encapsulated in 2D-carbon supporting material hybrids are discussed in detail to understand the relationships between unique morphology/structure and physicochemical properties for enhanced catalytic performance.
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.
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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.
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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.