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
Citations
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Journal ArticleDOI
High-Resolution Photoemission on Sr 2 RuO 4 Reveals Correlation-Enhanced Effective Spin-Orbit Coupling and Dominantly Local Self-Energies
Anna Tamai,Manuel Zingl,E. Rozbicki,Edoardo Cappelli,S. Riccò,A. de la Torre,S. McKeown Walker,Flavio Y. Bruno,Phil D. C. King,Worawat Meevasana,Ming Shi,Milan Radovic,Nicholas C. Plumb,Alexandra S. Gibbs,Andrew P. Mackenzie,Andrew P. Mackenzie,Christophe Berthod,Hugo U. R. Strand,Minjae Kim,Minjae Kim,Antoine Georges,Felix Baumberger,Felix Baumberger +22 more
TL;DR: In this article, the experimental work has been supported by the European Research Council (ERC), the Scottish Funding Council, the UK EPSRC and the Swiss National Science Foundation (SNSF).
Journal ArticleDOI
Coherent control of Rydberg states in silicon
P. T. Greenland,Stephen Anthony Lynch,A.F.G. van der Meer,B. N. Murdin,C. R. Pidgeon,B. Redlich,Nguyen Q. Vinh,Gabriel Aeppli +7 more
TL;DR: This work demonstrates the coherent control of impurity wavefunctions in the most ubiquitous donor in a semiconductor, namely phosphorus-doped silicon, and adds coherent terahertz radiation, as a particularly precise regulator of orbitals in solids, to the list of controls, such as pressure and chemical composition, already familiar to materials scientists.
Journal ArticleDOI
Localized Magnetic Moments with Tunable Spin Exchange in a Gas of Ultracold Fermions.
TL;DR: The experimental realization of a state-dependent lattice for a two-orbital fermionic quantum gas with strong interorbital spin exchange is reported on, finding that this exchange process can be tuned resonantly by varying the on-site confinement.
Journal ArticleDOI
A possible ground state and its electronic structure of a mother material (LaOFeAs) of new superconductors
TL;DR: The electronic and magnetic properties of the mother material LaOFeAs of new superconductors have been carefully studied using first-principles electronic structure calculations based on the generalized gradient approximation in the density functional theory.
Journal ArticleDOI
Anomalous Hall Effect —A New Perspective—
Naoto Nagaosa,Naoto Nagaosa +1 more
TL;DR: In this paper, the authors reviewed recent developments on the studies of the anomalous Hall effect from a quantum geometrical viewpoint and showed that the intrinsic contribution due to the Berry phase of the Bloch wave functions plays a major role in this phenomenon at least in several 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.
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.