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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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Nematicity of correlated systems driven by anisotropic chemical phase separation
Ye Yuan,René Hübner,Magdalena Birowska,Chi Xu,Chi Xu,Mao Wang,Mao Wang,Slawomir Prucnal,Rafal Jakiela,Kay Potzger,Roman Böttger,Stefan Facsko,Jacek A. Majewski,Manfred Helm,Manfred Helm,Maciej Sawicki,Shengqiang Zhou,Tomasz Dietl,Tomasz Dietl +18 more
TL;DR: In this paper, experimental and theoretical results for In{}_{1\ensuremath{-}x}$Fe${}_{x} $As demonstrate that anisotropic distribution of Fe cations at the growth surface (which has a lower symmetry than the bulk) can lead to a quenched nematic order of alloy components, which then governs lowtemperature magnetic and magnetotransport properties.
Journal ArticleDOI
Evidence for oxygen vacancy manipulation in La1/3Sr2/3FeO3−𝜹 thin films via voltage controlled solid-state ionic gating
Alex Krick,Steven J. May +1 more
TL;DR: In this paper, the structural and electronic transport properties of La1/3Sr2/3FeO3-δ/Gd-doped CeO2 heterostructures arising from the manipulation of δ are presented.
Journal ArticleDOI
Phase diagram of the Shastry-Sutherland Kondo lattice model with classical localized spins: a variational calculation study.
Munir Shahzad,Pinaki Sengupta +1 more
TL;DR: This work studies the Shastry-Sutherland Kondo lattice model with additional Dzyaloshinskii-Moriya (DM) interactions, exploring the possible magnetic phases in its multi-dimensional parameter space and identifies the parameter ranges over which various common magnetic orderings are potentially stabilized.
Journal ArticleDOI
Investigation of physical properties of manganite on example of Sm0.35Pr0.2Sr0.45MnO3
TL;DR: In this article, a 20% Pr doped Sm0.55Sr0.45MnO3 sample was used to study the magnetic and electrical properties of a metal semi-conductor.
Journal ArticleDOI
Realization of a transition between type-I and type-II Dirac semimetals in monolayers
Yuee Xie,Yuee Xie,Yujiao Kang,Yujiao Kang,Siwen Li,Siwen Li,Xiaohong Yan,Yuanping Chen,Yuanping Chen +8 more
TL;DR: In this article, the transition between type-I and type-II Dirac semimetals is realized in two-dimensional (2D) materials consisting of zigzag chains by tuning external strains.
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.
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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.