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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Dissertation
The Interplay of Lattice, Spin, and Charge Degrees of Freedom in Layered Cobaltates
TL;DR: In this paper, the structural and magnetic properties of a single-layered perovskite La(2-x)Sr(x)CoO(4) were investigated by means of x-ray diffraction and neutron scattering over a wide doping (0.05 <= x <= 1.1) and temperature (1.5 <= T <= 1000 K) range.
Journal ArticleDOI
Low-current-induced electrical hysteresis in Nd0.7Ca0.3MnO3
Daniel Hsu,J. G. Lin,W. F. Wu +2 more
TL;DR: The electrical characteristics of Nd0.7Ca0.3MnO3 were investigated by measuring voltage versus current (V•I) at various temperatures in this paper.
Journal ArticleDOI
Vibronic excitation dynamics in orbitally degenerate correlated electron system
Joji Nasu,Sumio Ishihara +1 more
TL;DR: In this article, the orbital-lattice coupled excitation dynamics in orbitally degenerate correlated systems is examined. But the present method is valid from weak to strong Jahn-Teller coupling magnitudes.
Journal ArticleDOI
Magnetic bipolar transistor based on ZnO/NiO/Si heterostructure using pulsed laser deposition
TL;DR: In this paper, magnetic bipolar transistor was fabricated by growing thin films of p-NiO and n-ZnO on n-type silicon wafer by pulsed laser deposition technique with an in-situ annealing at 670° C in the presence of oxygen.
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Correlation of structural distortion with magnetic properties in electron-doped Ca0.9R0.1MnO3 perovskites (R=rare-earth)
TL;DR: A series of electron-doped orthorhombic-perovskite manganites Ca0.9R0.1MnO3 (R=La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Yb) are synthesized for a systematic study of their crystal structure and magnetic properties as mentioned in this paper.
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.
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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.