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Orbital Physics in Transition-Metal Oxides
Yoshinori Tokura,Naoto Nagaosa +1 more
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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
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Suppression of the cooperative Jahn-Teller distortion and its effect on the Raman octahedra-rotation modes of TbM n 1 -x F e x O 3
R. Vilarinho,D. J. Passos,E. C. Queirós,P. B. Tavares,Abílio Almeida,Mads C. Weber,Mael Guennou,Jens Kreisel,J. Agostinho Moreira +8 more
TL;DR: In this article, the amplitude of the cooperative Jahn-Teller distortion decreases linearly from 0 to 0.5, where it is completely suppressed, and the authors correlate this evolution with the behavior of the Raman modes across the solid solution.
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Charge ordering induced metal–semiconductor transition in Ag2BiO3: A first-principles study
TL;DR: In this paper, the relationship of ground-state crystal structures and electronic properties of Ag2BiO3 compound was investigated. But the results were limited to the Pnna and Pnnna phases.
Journal ArticleDOI
The effect of K+, Na+ doping on infrared emissivity of lanthanum manganites
TL;DR: In this paper, the structure, infrared absorption, electron spin resonance (ESR) and infrared normal emissivity (e N ) in the 8-14-μm waveband of the monovalent-doped lanthanum manganites La1−xAxMnO3 (A=K and Na, 0.1 ≤ x ≤ 0.4 ) were systematically investigated.
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Investigation of the structural, electrical, optical and magnetic properties of XMg 4 Mn 6 O 15 (X = K, Rb, and Cs) compounds
Journal ArticleDOI
A power-adjustable superconducting terahertz source utilizing electrical triggering phase transitions in vanadium dioxide
Luyao Hao,Luyao Hao,Xianjing Zhou,Xianjing Zhou,Zhang-Zhao Yang,Hang-Fei Zhang,Hancong Sun,Hancong Sun,H. X. Cao,P. H. Dai,Jun Li,Takeshi Hatano,Huabing Wang,Huabing Wang,Qi-Ye Wen,P. H. Wu +15 more
TL;DR: In this paper, a superconducting terahertz (THz) source, comprising a stack of Bi2Sr2CaCu2O8 intrinsic Josephson junctions (IJJs) and a vanadium dioxide (VO2) tunable attenuator with coplanar interdigital contacts, is presented.
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.
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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.