Journal ArticleDOI
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
Citations
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Spin-orbital entanglement and violation of the Goodenough-Kanamori rules.
TL;DR: It is pointed out that large composite spin-orbital fluctuations in Mott insulators with t(2g) orbital degeneracy are a manifestation of quantum entanglement of spin and orbital variables, which results in a dynamical nature of the spin superexchange interactions.
Journal ArticleDOI
Mapping the unconventional orbital texture in topological crystalline insulators
Ilija Zeljkovic,Yoshinori Okada,Yoshinori Okada,Cheng-Yi Huang,Raman Sankar,Daniel Walkup,Wenwen Zhou,Maksym Serbyn,Fangcheng Chou,Wei-Feng Tsai,Hsin Lin,Arun Bansil,Liang Fu,M. Zahid Hasan,Vidya Madhavan +14 more
TL;DR: In this article, the orbital texture of Pb1−xSnxSe, a prototypical topological crystalline insulator, was revealed by using Fourier-transform scanning tunnelling spectroscopy.
Journal ArticleDOI
In situ observation of picosecond polaron self-localisation in α-Fe2O3 photoelectrochemical cells
Ernest Pastor,Ji-Sang Park,Ludmilla Steier,Sung-Hyun Kim,Michael Grätzel,James R. Durrant,Aron Walsh,Aron Walsh,Artem A. Bakulin +8 more
TL;DR: An in situ observation of charge carrier self-localisation in a hematite device is reported, and this process affects recombination losses in photoelectrochemical cells, and an optical-control method with photocurrent detection is used to track small polarons in real time and demonstrate that they impact photoelectrifying cell activity.
Journal ArticleDOI
Anomalous anisotropic magnetoresistance in epitaxial Fe 3 O 4 thin films on MgO(001)
TL;DR: In this article, the angular dependence of the anisotropic magnetoresistance (AMR) was studied for epitaxial films of magnetite and showed that the AMR exhibits a twofold symmetry at temperatures above 200 K and an additional set of peaks appeared at lower temperatures showing an overall fourfold symmetry.
Journal ArticleDOI
LDA+DMFT implemented with the pseudopotential plane-wave approach
Giancarlo Trimarchi,Giancarlo Trimarchi,Giancarlo Trimarchi,I. Leonov,Nadia Binggeli,Nadia Binggeli,Dm. M. Korotin,V. I. Anisimov +7 more
TL;DR: In this article, a joint implementation of dynamical-mean-field theory (DMFT) with the pseudopotential plane-wave approach via Wannier functions is presented for the determination of the electronic properties of strongly correlated materials.
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.
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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.