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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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Colossal magnetoresistance in the insulating ferromagnetic double perovskites Tl2NiMnO6: A neutron diffraction study
Lei Ding,Dmitry D. Khalyavin,Pascal Manuel,Joseph Blake,Fabio Orlandi,Wei Yi,Alexei A. Belik +6 more
TL;DR: In this article, a relatively ordered double perovskite, Tl2NiMnO6, was shown to have colossal magnetoresistance (CMR) in the vicinity of its Curie temperature.
Journal ArticleDOI
Magnetic properties of the rare earth cerium orthochromite perovskite CeCrO3
S. Mtougui,R. Khalladi,N. El Mekkaoui,I. El Housni,S. Idrissi,Soumia Ziti,Hicham Labrim,L. Bahmad +7 more
TL;DR: In this article, the phase diagrams and the magnetic properties of the rare earth Cerium Orthochromite Perovskite CeCrO3 were studied using Monte Carlo Simulations (MCS).
A two-orbital quantum gas with tunable interactions
TL;DR: In this article, the authors prasentiert die experimentelle Charakterisierung der Wechselwirkung ultrakalter, fermionischer Ytterbium-Atome (173Yb) in verschiedenen elektronischen Orbitalen.
Journal ArticleDOI
Charge order melting and magnetic transition in Nd0.5(1+x)Ca0.5(1−x)Mn(1−x)CrxO3 system
TL;DR: In this paper, the magnetic properties of double doped manganite Nd 0.5(1+ x ) Ca 0.3 O 3 with a fixed ratio of Mn 3+ :Mn 4+ = 1:1 has been investigated.
Journal ArticleDOI
Nonthermal pathways to ultrafast control in quantum materials
A. de la Torre,Dante M. Kennes,Dante M. Kennes,Martin Claassen,Simon Gerber,James McIver,Michael A. Sentef +6 more
TL;DR: In this article, the authors review recent progress in utilizing ultrafast light-matter interaction to control the macroscopic properties of quantum materials and discuss a selection of recently discovered effects leveraging these mechanisms, as well as the technological advances that led to their discovery.
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.