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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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Excited state spectroscopy of the silica sol–gel glass activated by Cr5+ and Cr6+ ions
TL;DR: In this paper, the authors report on the optical spectroscopy of the silica sol-gel glass doped with chromium of various valences where Cr6+ and Cr5+ ions appear to be most active.
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Thermoelectric and phononic properties of (Gd, Tb) MnO3 compounds: DFT calculations
H. A. Rahnamaye Aliabad,Z. Barzanuni,S. Ramezani Sani,Iftikhar Ahmad,S. Jalali-Asadabadi,H. Vaezi,M. Dastras +6 more
TL;DR: In this paper, the structural, electronic, magnetic, phononic and thermoelectric properties of rare earth multiferroic manganite RMnO 3 (R = Gd and Tb) compounds were investigated by the density functional theory within the spin polarized GGA, LDA and mBJ+U++SOC.
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Crystal structures and magnetic order of La 0.5 + δ A 0.5 − δ Mn 0.5 + ϵ Ru 0.5 − ϵ O 3 ( A = Ca , Sr , Ba ) : Possible orbital glass ferromagnetic state
Eduardo Granado,Qingzhen Huang,Jeffrey W. Lynn,Jeffrey W. Lynn,J. Gopalakrishnan,J. Gopalakrishnan,Kannadka Ramesha +6 more
TL;DR: In this article, the authors investigated the crystallographic and magnetic properties of a perovskite crystal structure, with regular octahedra and no chemical ordering of the ions, and the observed long-range ferromagnetism and the absence of orbital ordering were rationalized in terms of a strong hybridization.
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Metals doped cesium based all inorganic perovskite solar cells: Investigations on Structural, morphological and optical properties
TL;DR: In this paper, an all solid state planar perovskite solar cells (PSCs) based on organic-free CsPbI3 and both organic and iodine free Cs PbBr3 were presented.
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Ferromagnetic Cluster on La2FeMnO6
TL;DR: The structural, magnetic and electrical transport properties of La2MnFeO6 bulk samples prepared by combustion synthesis have been investigated in this article, where the X-ray powder diffraction (XRD) patterns with Rietveld refinement at room temperature showed that samples were formed in single phase with an orthorhombic structure space group Pnma (62).
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.