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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
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Journal ArticleDOI
The Magnetic Genome of Two-Dimensional van der Waals Materials
Qing Hua Wang,Amilcar Bedoya-Pinto,Mark Blei,Avalon H. Dismukes,Assaf Hamo,Sarah N. M. Jenkins,Maciej Koperski,Yu Liu,Qi-Chao Sun,Evan J. Telford,Hyun Ho Kim,Mathias Augustin,Uri Vool,Jiaxin Yin,Lu Hua Li,Alexey Falin,Cory Dean,Fèlix Casanova,Richard Evans,Mairbek Chshiev,Artem Mishchenko,Cedomir Petrovic,Rui He,Liu-Bin Zhao,Adam W. Tsen,Brian D. Gerardot,Mauro Brotons-Gisbert,Zurab Guguchia,Xavier Roy,Sefaattin Tongay,Ziwei Wang,M. Z. Hasan,Joerg Wrachtrup,Amir Yacoby,Albert Fert,Stuart S. P. Parkin,Kostya S. Novoselov,Pengcheng Dai,Luis Balicas,Elton J. G. Santos +39 more
TL;DR: A comprehensive review of 2D magnetism can be found in this paper , where prominent authors with expertise in complementary fields of magnetism (i.e., synthesis, device engineering, magneto-optics, imaging, transport, mechanics, spin excitations, and theory and simulations) have joined together to provide a genome of current knowledge and a guideline for future developments in 2D magnetic materials research.
Journal ArticleDOI
Recent advances in fullerene superconductivity
TL;DR: In this paper, the properties and properties of intercalated fullerides are reviewed, paying particular attention to the correlation between superconductivity and interfullerene separation, orientational order/disorder, valence state, orbital degeneracy, low-symmetry distortions, and metal-C 60 interactions.
Journal ArticleDOI
Synthesis of Single-Crystalline La1-xBaxMnO3 Nanocubes with Adjustable Doping Levels
TL;DR: In this article, a hydrothermal synthesis of single-crystalline nanocubes composed of lanthanum barium manganite (La1-xBaxMnO3) with three different doping levels (x = 0.3, 0.5, and 0.6) was reported.
Journal ArticleDOI
Polarons and confinement of electronic motion to two dimensions in a layered manganite.
Henrik M. Rønnow,Ch. Renner,Ch. Renner,Gabriel Aeppli,Gabriel Aeppli,Tsuyoshi Kimura,Yasuhiro Tokura +6 more
TL;DR: The data demonstrate quantitatively that because the charge carriers are attached to polarons, it is as difficult to remove them from the planes through vacuum-tunnelling into a conventional metallic tip, as it is for them to move between Mn-rich layers within the material itself.
Journal ArticleDOI
Superconductivity in the Ferroquadrupolar State in the Quadrupolar Kondo Lattice PrTi2Al20
TL;DR: The cubic compound PrTi 2 Al 20 exhibits type-II superconductivity at T c = 200 mK in the nonmagnetic ferro-quadrupolar state 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.