Journal ArticleDOI
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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Spin liquids in frustrated magnets
TL;DR: This exotic behaviour of frustrated magnets is now being uncovered in the laboratory, providing insight into the properties of spin liquids and challenges to the theoretical description of these materials.
Journal ArticleDOI
Angle-resolved photoemission studies of the cuprate superconductors
TL;DR: A review of the most recent ARPES results on the cuprate superconductors and their insulating parent and sister compounds is presented in this article, with the purpose of providing an updated summary of the extensive literature.
Journal ArticleDOI
Real-space observation of a two-dimensional skyrmion crystal
X. Z. Yu,Yoshinori Onose,Naoya Kanazawa,Jin-Hong Park,Jung Hoon Han,Yoshio Matsui,Naoto Nagaosa,Yoshinori Tokura +7 more
TL;DR: Real-space imaging of a two-dimensional skyrmion lattice in a thin film of Fe0.5Co 0.5Si using Lorentz transmission electron microscopy reveals a controlled nanometre-scale spin topology, which may be useful in observing unconventional magneto-transport effects.
Journal ArticleDOI
Complexity in Strongly Correlated Electronic Systems
TL;DR: The spontaneous emergence of electronic nanometer-scale structures in transition metal oxides, and the existence of many competing states, are properties often associated with complex matter where nonlinearities dominate, such as soft materials and biological systems.
Journal ArticleDOI
Inorganic caesium lead iodide perovskite solar cells
Giles E. Eperon,Giuseppe M. Paternò,Giuseppe M. Paternò,Rebecca J. Sutton,Andrea Zampetti,Andrea Zampetti,Amir A. Haghighirad,Franco Cacialli,Franco Cacialli,Henry J. Snaith +9 more
TL;DR: In this paper, the authors showed that the organic cation is not essential, but simply a convenience for forming lead triiodide perovskites with good photovoltaic properties.
References
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Journal ArticleDOI
Electronic structure and orbital ordering in perovskite-type 3d transition-metal oxides studied by Hartree-Fock band-structure calculations.
TL;DR: Single-particle excitation spectra calculated using Koopmans' theorem give an approximate but relevant picture on the electronic structure of the perovskite-type 3d transition-metal oxides.
Journal ArticleDOI
Visualization of the Local Insulator-Metal Transition in Pr0.7Ca0.3MnO3
TL;DR: In this paper, the light-induced insulator-metal transition in the "colossal magnetoresistance" compound Pr0.7Ca0.3MnO3 is shown to generate a well-localized conducting path while the bulk of the sample remains insulating.
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Crucial role of the lattice distortion in the magnetism of LaMnO3.
TL;DR: A detailed analysis of lattice effects on the magnetic behavior of the parent compound LaMnO3 by using the local-spin-density approximation (LSDA) and the Jahn-Teller distortion (JTD) is presented.
Journal Article
Visualization of the local insulator-metal transition in Pr0.7Ca0.3MnO3 (vol 280, pg 1925, 1998)
TL;DR: The light-induced insulator-metal transition in the "colossal magnetoresistance" compound Pr0.7Ca0.3MnO3 is shown to generate a well-localized conducting path while the bulk of the sample remains insulating, providing insight into electronic transport in materials with strong magnetic correlations.
Journal ArticleDOI
Competing instabilities and metastable states in (Nd,Sm)1/2Sr1/2MnO3.
TL;DR: A systematic study on the metal-insulator phase diagram in the $T\ensuremath{-}H$ plane with varying y as well as a high-pressure study has revealed the metastable nature of the undercooled ferromagnetic metallic state.