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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Phase coexistence and electric-field control of toroidal order in oxide superlattices.
Anoop R. Damodaran,Anoop R. Damodaran,James D. Clarkson,James D. Clarkson,Zijian Hong,Hanyu Liu,Ajay K. Yadav,Ajay K. Yadav,Christopher T. Nelson,Christopher T. Nelson,Shang-Li Hsu,Shang-Li Hsu,Margaret McCarter,Kyoung-Duck Park,Vasily Kravtsov,Alan Farhan,Yongqi Dong,Z. Cai,H. Zhou,Pablo Aguado-Puente,Pablo Aguado-Puente,Pablo García-Fernández,Jorge Íñiguez,Javier Junquera,Andreas Scholl,Markus B. Raschke,Long Qing Chen,Dillon D. Fong,Ramamoorthy Ramesh,Ramamoorthy Ramesh,Lane W. Martin,Lane W. Martin +31 more
TL;DR: Systems that exhibit phase competition, order parameter coexistence, and emergent order parameter topologies constitute a major part of modern condensed-matter physics and are observed to be found in PbTiO3/Sr TiO3 superlattices.
Journal ArticleDOI
High-spin to low-spin and orbital polarization transitions in multiorbital Mott systems.
Philipp Werner,Andrew J. Millis +1 more
TL;DR: It is found that the Hund coupling can drive the system into a novel Mott insulating phase with vanishing orbital susceptibility, and away from half-filling, the crystal field splitting can induce an orbital selective Mott state.
Journal ArticleDOI
Spin-orbital phase diagram of perovskite-type R VO 3 ( R = rare -earth ion or Y)
TL;DR: In this article, the global phase diagram for the spin and orbital ordering for perovskite-type $R{\mathrm{VO}}_{3}$ $(R$ being a rare-earth ion or Y) by measurements of specific heat, magnetization, and Raman-scattering spectra was investigated.
Journal ArticleDOI
Femtosecond switching of magnetism via strongly correlated spin–charge quantum excitations
Tianqi Li,Aaron Patz,Aaron Patz,Leonidas Mouchliadis,Leonidas Mouchliadis,Jiaqiang Yan,Jiaqiang Yan,Thomas A. Lograsso,Ilias E. Perakis,Ilias E. Perakis,Jigang Wang,Jigang Wang +11 more
TL;DR: These results merge two fields, femtosecond magnetism in metals and band insulators, and non-equilibrium phase transitions of strongly correlated electrons, in which local interactions exceeding the kinetic energy produce a complex balance of competing orders.
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 as discussed by the authors.
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.