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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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Real-space observation of skyrmion lattice in helimagnet MnSi thin samples.
Akira Tonomura,Xiuzhen Yu,Keiichi Yanagisawa,Tsuyoshi Matsuda,Yoshinori Onose,Naoya Kanazawa,Hyun Soon Park,Yoshinori Tokura +7 more
TL;DR: The skyrmion phase was stable over a wide range of temperatures and magnetic fields in the thin samples, and the lattice constant was estimated to be 18 nm, almost identical to the helical period.
Journal ArticleDOI
Recent progress in the phase-transition mechanism and modulation of vanadium dioxide materials
TL;DR: Xun Cao et al. as mentioned in this paper reviewed the phase-transition mechanism and modulation of vanadium dioxide (VO2) materials and provided a representative understanding on the phase transition mechanism, such as the lattice distortion and electron correlations.
Journal ArticleDOI
Whither the oxide interface
TL;DR: Interfaces formed by transition-metal oxide materials offer a tremendous opportunity for fundamental as well as applied research, yet, several challenges remain.
Journal ArticleDOI
Organic metals and superconductors based on BETS (BETS = bis(ethylenedithio)tetraselenafulvalene).
TL;DR: The extended Hückel tightbinding band examinations of a series of molecular conductors with the networks of peripheral chalcogen atoms gave an important hint to develop new organic metals with stable 2-D cylindrical Fermi surfaces on the basis of multi-chalcogen π donor molecules.
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Recent progress in voltage control of magnetism: Materials, mechanisms, and performance
TL;DR: In this paper, the authors provide a comprehensive review of recent progress in voltage control of magnetism in different thin films and discuss the challenges and future prospects of VCM, which will inspire more in-depth research and advance the practical applications of this field.
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.