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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
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Ab Initio Approaches for Low‐Energy Spin Hamiltonians
TL;DR: In order to predict and establish spin Hamiltonians for real magnetic materials, a variety of first principles have been developed, based on density functional theory and wave function methodologies, with a focus on their practical capabilities and limitations.
Journal ArticleDOI
Edge magnetization and spin transport in an SU(2)-symmetric Kitaev spin liquid
TL;DR: In this paper, the edge magnetism and spin transport properties of an SU(2)-symmetric Kitaev spin liquid (KSL) model were investigated on the honeycomb lattice, and it was shown that when a magnetic field is applied on a zigzag edge, the Dirac KSL exhibits a nonlocal magnetization associated with the existence of zero energy edge modes.
Journal Article
Two-stage orbital order and dynamical spin frustration in KCuF 3
James Lee,Shi Yuan,Siddhartha Lal,Young Il Joe,Yu Gan,Serban Smadici,Paul M. Goldbart,S. Lance Cooper,Peter Abbamonte,Ken Finkelstein,Yejun Feng,Andrivo Rusydi +11 more
TL;DR: In this paper, the Kugel-Khomskii model was used to explain the structural phase transition of the CuF6 octahedra in KCuF3 and showed that the rotations are quasi-ordered and exhibit glassy hysteresis.
Journal ArticleDOI
Universality in one-dimensional orbital wave ordering in spinel and related compounds: an experimental perspective
TL;DR: In this article, a 1D orbital wave ordering for transition metal spinels has been proposed, where the d-orbital charge carriers undergo ordering transitions with the formation of local'molecular bonding' units such as dimers in MgTi2O4, octomers in CuIr2S4, and heptamers in AlV2 O4.
Journal ArticleDOI
Effect of crystallinity on the transport properties of Nd0.67Sr0.33MnO3 thin films
Hsing-Lin Wang,Xuan Zhang,M. F. Hundley,J. D. Thompson,Brady J. Gibbons,Y. Lin,Paul N. Arendt,S. R. Foltyn,Q. X. Jia,Judith L. MacManus-Driscoll +9 more
TL;DR: In this paper, the microstructural properties of NSMO using x-ray diffraction (XRD), transmission electron microscopy (TEM) and high resolution TEM were studied.
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.