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
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A new route to relativistic insulators: Lifshitz transition driven by spin fluctuations and spin-orbit renormalization in NaOsO$_3$
Bongjae Kim,Peitao Liu,Zeynep Ergonenc,Alessandro Toschi,Sergii Khmelevskyi,Cesare Franchini +5 more
TL;DR: The metal-to-insulator transition in the antiferromagnetic 5$d^{3}$ insulator NaOsO$_3$ by means of first-principles calculations was studied in this article.
Journal ArticleDOI
Effect of anisotropic strain on the charge ordering transition in manganite films
TL;DR: In this article, the substrate induced anisotropic strain was found to have a significant effect on the charge ordering (CO) transition and surface morphology in Bi0.4Ca0.6MnO3 films.
Reference EntryDOI
Orbital Physics in Transition Metal Oxides: Magnetism and Optics
TL;DR: In this article, a review of spin-orbital superexchange models for transition metal oxides is presented, which provides a concise description of spin and orbital order, effective spin interactions, spin waves, and orbiton excitations in doped and undoped Mott insulators.
Journal ArticleDOI
Emergent Fermi Surface in a Triangular-Lattice SU(4) Quantum Antiferromagnet.
TL;DR: In this article, the authors studied the quantum antiferromagnet with a fundamental representation on each site of the triangular lattice and provided evidence for a gapless liquid ground state with an emergent Fermi surface of fractionalized fermionic partons coupled with a U(1) gauge field.
Journal ArticleDOI
Orbital Ordering Structures in (Nd,Pr)0.5Sr0.5MnO3 Manganite Thin Films on Perovskite (011) Substrates
Yusuke Wakabayashi,D. Bizen,Y. Kubo,Hironori Nakao,Youichi Murakami,Masao Nakamura,Masao Nakamura,Yasushi Ogimoto,Kenjiro Miyano,Hiroshi Sawa +9 more
TL;DR: In this paper, the lattice parameters of four manganite thin films, Nd0.5Sr 0.5MnO3 (NSMO) or Pr0. 5Sr0.1mNd 0.3mO3(PSMO) on (011) surfaces of SrTiO3 or [(LaAlO3){0.3}(SrAl 0.4mN 0.7mNO3)] (LSAT), were measured as a function of temperature.
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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.
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.