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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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Direct experimental evidence of physical origin of electronic phase separation in manganites
Tian Miao,Lina Deng,Wenting Yang,Jinyang Ni,Changlin Zheng,Joanne Etheridge,Sha-Sha Wang,Hao Liu,Hanxuan Lin,Yang Yu,Qian Shi,Peng Cai,Yinyan Zhu,Tieying Yang,Xingmin Zhang,Xingyu Gao,Chuanying Xi,Mingliang Tian,Xiaoshan Wu,Hongjun Xiang,Elbio Dagotto,Elbio Dagotto,Lifeng Yin,Jian Shen,Jian Shen +24 more
TL;DR: Using tricolor monoatomic superlattice growth, direct experimental evidence is provided to show that the chemical-dopants-induced disorder is crucial for electronic phase separation and colossal magnetoresistance effect, suggesting that correlated materials in general likely need deviations from ideality to display the crucial nonlinear effects important for devices.
Journal ArticleDOI
Terahertz Electrodynamics in Transition Metal Oxides
Kadakuntla Santhosh Kumar,G. L. Prajapati,Rahul Dagar,Megha Vagadia,D. S. Rana,Masayoshi Tonouchi +5 more
Journal ArticleDOI
Electric-pulse-induced reflectance change in the thin film of perovskite manganite
TL;DR: In this article, the authors demonstrate a nonvolatile, reversible change of infrared reflectance from the thin film of perovskite manganite (Pr1−xCaxMnO3) by applying electric pulse.
Journal ArticleDOI
Chemical potential shift and spectral-weight transfer inPr1−xCaxMnO3revealed by photoemission spectroscopy
K. Ebata,Hiroki Wadati,Masaru Takizawa,A. Fujimori,Akira Chikamatsu,Hiroshi Kumigashira,M. Oshima,Yasuhide Tomioka,Y. Tokura,Y. Tokura +9 more
TL;DR: In this paper, the chemical potential shift and changes in the electronic density of states near the Fermi level (E_F$) as a function of carrier concentration in PCMO (PCMO, $0.2 \le x \le 0.65$) through the measurements of photoemission spectra.
Journal ArticleDOI
Interference effects in the conductance of multilevel quantum dots
TL;DR: In this article, the transport properties of multilevel quantum dots are investigated in the Kondo regime, and it is shown that these channels can carry a different phase, and destructive interference processes are observed when the phase difference between them is $\ifmmode\pm\else\textpm\fi{}\ensuremath{\pi}$.
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.
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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.