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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Journal ArticleDOI
Tuning the metal-insulator transition in epitaxial SrVO3 films by uniaxial strain
Changan Wang,Hongbin Zhang,Kumar Deepak,Chao Chen,Arnaud Fouchet,Juanmei Duan,Donovan Hilliard,Ulrich Kentsch,Deyang Chen,Min Zeng,Xingsen Gao,Yu-Jia Zeng,Manfred Helm,Wilfrid Prellier,Shengqiang Zhou +14 more
TL;DR: In this paper, an effective tuning of the metal-insulator transition (MIT) in epitaxial SrVO3 (SVO) films by expanding the out-of-plane lattice constant without changing in-planar lattice parameters, through helium ion irradiation, was reported.
Journal ArticleDOI
Magnetic and charge ordering properties of Bi0.2Ca0.8Mn0.9X0.1O3 (where X = Ti, Cr, Fe, Co, Ni, Cu)
TL;DR: In this article, structural, magnetic and transport properties of Bi0.2Ca0.8Mn0.9X0.1O3 (BCMO) have been investigated, and the parent sample exhibits robust charge-ordered antiferrromagnetic (COAFM) phase with charge ordering temperature (TCO) ∼155 K and AFM Neel temperature (TN) ∼105 K.
Journal ArticleDOI
Charge and Orbital Ordering in the Triangular-Lattice t2g-Orbital System in One Dimension: A Possible Ground State of BixV8O16
Yoshinori Shibata,Yukinori Ohta +1 more
TL;DR: In this article, the possible charge and orbital ordering in a Hollandite compound Bi x V 8 O 16, which is a new one-dimensional triangular-lattice t 2 g -orbital system, was considered.
Journal ArticleDOI
Orbital optical lattices with bosons
TL;DR: In this article, the 2nd, 4th and 7th bands in a bipartite square lattice are discussed, and the authors provide a synopsis of their recent experimental work exploring Bose-Einstein condensation in metastable higher Bloch bands of optical lattices.
Journal ArticleDOI
Charge localization at the interface between La1−xSrxMnO3 and the “infinite layers” cuprate CaCuO2
Nan Yang,D. Di Castro,Carmela Aruta,Claudio Mazzoli,Matteo Minola,Nicholas B. Brookes,M. Moretti Sala,Wilfrid Prellier,Oleg I. Lebedev,Antonello Tebano,Giuseppe Balestrino +10 more
TL;DR: In this paper, X-ray absorption spectroscopy measurements show a clear evidence of an orbital reconstruction at the interface, ascribed to the hybridization between the Cu 3d3z2−r2 and the Mn 3d 3xSrxMnO3 orbitals via interface apical oxygen ions.
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.