Journal ArticleDOI
Orbital Physics in Transition-Metal Oxides
Yoshinori Tokura,Naoto Nagaosa +1 more
Reads0
Chats0
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
More filters
Journal ArticleDOI
Electrostatic gating and intercalation in 2D materials
Journal ArticleDOI
Re-entrant charge-ordering behaviour in the layered manganites La2-2xSr1+2xMn2O7
TL;DR: In this paper, the authors investigated the charge-ordering behavior of layered manganites La2-2xSr1+2xMn2O7 (0.3≤x≤0.8) by means of transport and magnetization measurements.
Journal ArticleDOI
Antiferro Quadrupole Orders in Non-Kramers Doublet Systems
TL;DR: In this paper, the authors investigated antiferro quadrupole orders in systems with non-Kramers doublet ground state with total angular momentum J = 4 in Td point group symmetry.
Journal ArticleDOI
Charge Order Competition Leading to Nonlinearity in Organic Thyristor Family
Yoshio Nogami,Noriaki Hanasaki,Masashi Watanabe,Kenichiro Yamamoto,Takayoshi Ito,Naoshi Ikeda,Hiroyuki Ohsumi,Hidenori Toyokawa,Yukio Noda,Ichiro Terasaki,Hatsumi Mori,Takehiko Mori +11 more
TL;DR: In this article, the presence of microscopic competing domains between the twofold and 3 × 4 charge orderings in a triangular lattice has been revealed for the organic thyristor family compound θ-(BEDT-TTF) 2 RbZn(SCN) 4.
Journal ArticleDOI
Orbital orderings and optical conductivity of SrRuO3 and CaRuO3: first-principles studies
TL;DR: The down-spin t(2g) of Ru show antiferromagnetic-like orbital order in the a-b plane and a d-d transition peak at an energy of about 1.0 eV in the calculated optical conductivity is observed.
References
More filters
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.
Journal ArticleDOI
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.