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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
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Soft-X-ray ARPES at the Swiss Light Source: From 3D Materials to Buried Interfaces and Impurities
Vladimir N. Strocov,Masaki Kobayashi,Xiaoqiang Wang,L. L. Lev,J. Krempasky,Victor V. Rogalev,Thorsten Schmitt,Claudia Cancellieri,M. L. Reinle-Schmitt +8 more
TL;DR: In this article, the authors report on the recent instrumental progress at the Swiss Light Source (SLS), where a new soft-X-ray ARPES facility was in operation.
Journal ArticleDOI
The external and internal influences on the tuning of the properties of perovskites: An overview
TL;DR: In this paper, the authors discuss the different effects of hypothetical and experimental methods that can modify the properties of perovskites for suitable device applications and provide a clear idea to experienced researchers about the different methods adopted to tune the properties.
Journal ArticleDOI
Optical study of orbital excitations in transition-metal oxides
R. Rückamp,Eva Benckiser,Maurits W. Haverkort,H. Roth,Thomas Lorenz,A. Freimuth,Liesbet Jongen,Angela Möller,Gerd Meyer,Pascal Reutler,Bernd Büchner,A. Revcolevschi,Sang-Wook Cheong,Chinnathambi Sekar,Gernot Krabbes,Markus Grüninger,Markus Grüninger +16 more
TL;DR: In this article, the orbital excitations of a series of transition-metal compounds are studied by means of optical spectroscopy, and the authors identify signatures of collective orbital excitation by comparison with experimental and theoretical results for predominantly local crystal-field excitations.
Journal ArticleDOI
SU(4) Heisenberg model on the honeycomb lattice with exchange-frustrated perturbations: Implications for twistronics and Mott insulators
TL;DR: In this article, the SU(4)-symmetric spin-orbital model on the honeycomb lattice was studied in connection to correlated insulators such as the Mott insulator and the magic-angle twisted bilayer graphene at quarter filling.
Journal ArticleDOI
Mn valence instability in La 2/3 Ca 1/3 Mn O 3 thin films
Sergio Valencia,Andreas Gaupp,W. Gudat,Ll. Abad,Ll. Balcells,A. Cavallaro,Benjamín Martínez,Francisco Palomares +7 more
TL;DR: In this article, a Mn valence instability on thin films was observed by x-ray absorption spectroscopy at the Mn $L$-edge and O $K$-Edge.
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.
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.
Journal ArticleDOI
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.