Journal ArticleDOI
Orbital Physics in Transition-Metal Oxides
Yoshinori Tokura,Naoto Nagaosa +1 more
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TLDR
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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Strong orbital polarization in orthorhombic DyMnO3: A combined x-ray linear dichroism and ab initio electronic structure study
Jin-Ming Chen,Zhiwei Hu,Horng-Tay Jeng,Yi Ying Chin,J. M. Lee,S. W. Huang,K. T. Lu,C. K. Chen,Shu-Chih Haw,T. L. Chou,H.-J. Lin,C. C. Shen,Ru-Shi Liu,Arata Tanaka,Liu Hao Tjeng,C. T. Chen +15 more
TL;DR: In this paper, a combined experimental and theoretical study on the orbital occupation in orthorhombic (DyMnO)) single crystals is presented, indicating a strong polarization dependence in the x-ray absorption spectra, indicative for a distinct anisotropic orbital occupation.
Journal ArticleDOI
Geometric phase and quantum phase transition in the one-dimensional compass model
L. C. Wang,X. X. Yi +1 more
TL;DR: In this article, the geometric phase of the ground state of the one-dimensional compass model in a transverse field is studied and the critical properties of the system in terms of the geometric phases are calculated and discussed.
Tensor network techniques for strongly correlated systems
TL;DR: It is demonstrated that the MPS framework represents a viable tool to determine finite-temperature properties of highly-frustrated spin systems down to low temperatures and a symmetry-enhanced version of the minimally entangled typical states (METTS) algorithm designed for the study of spectral quantities at finite temperature.
Journal ArticleDOI
Pressure-induced long-range magnetic ordering in cobalt oxide.
Yang Ding,Yang Ding,Yang Ren,Paul Chow,Paul Chow,Jianzhong Zhang,Sven C. Vogel,Bjoern Winkler,Jian Xu,Yusheng Zhao,Ho-kwang Mao,Ho-kwang Mao +11 more
TL;DR: In this paper, a long-range magnetic ordering transition in cobalt oxide was observed around $2.2 million at room temperature using neutron diffraction and the magnetic structure was type-II antiferromagnetic.
Journal ArticleDOI
Hydrogen incorporation induced the octahedral symmetry variation in VO 2 films
Dooyong Lee,Hyegyeong Kim,Jiwoong Kim,Ik-Jae Lee,Yooseok Kim,Hyung-Joong Yun,Jouhahn Lee,Sungkyun Park +7 more
TL;DR: In this paper, the microscopic aspects of macroscopic physical property variations of hydrogen annealed VO2 films, deposited on Al2O3(0001) substrates by RF magnetron sputtering, were examined.
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.
Journal ArticleDOI
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.