Dynamic Jahn-Teller Effect and Colossal Magnetoresistance in La 1-x Sr x MnO 3
TLDR
A model which incorporates the physics of dynamic Jahn-Teller and double-exchange effects is presented and solved via a dynamical mean field approximation to reproduce the behavior of the resistivity and magnetic transition temperature observed in Sr_x MnO_3.Abstract:
A model for the doped rare-earth manganites such as ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ incorporating the physics of dynamic Jahn-Teller and double-exchange effects is presented and solved via a dynamical mean field approximation. The interplay of these two effects as the electron phonon coupling is varied reproduces the observed behavior of the resistivity and magnetic transition temperature.read more
Citations
More filters
Journal ArticleDOI
Mixed-valence manganites: fundamentals and main properties
TL;DR: In this article, the authors trace how the ground state evolves with doping and give a self-consistent analysis of various thermodynamic, optical and transport properties of metallic manganites, isotope effect, etc.
Journal ArticleDOI
A new class of magnetic materials: Sr2FeMoO6 and related compounds
TL;DR: The origin of the magnetism in this class of compounds is based on a novel kinetically-driven mechanism, which is also likely to be responsible for the unusually high temperature ferromagnetism in several other systems, such as dilute magnetic semiconductors, as well as in various half-metallic ferromagnetic systems such as Heussler alloys as discussed by the authors.
Journal ArticleDOI
Ultrafast Phase Transition via Catastrophic Phonon Collapse Driven by Plasmonic Hot-Electron Injection
Kannatassen Appavoo,Kannatassen Appavoo,Bin Wang,Nathaniel Brady,Minah Seo,Joyeeta Nag,Rohit P. Prasankumar,David J. Hilton,Sokrates T. Pantelides,Sokrates T. Pantelides,Richard F. Haglund +10 more
TL;DR: The demonstration of subpicosecond phase transformations that are triggered by optically induced electron injection opens the possibility of designing hybrid nanostructures with unique nonequilibrium properties as a critical step for all-optical nanophotonic devices with optimizable switching thresholds.
Journal ArticleDOI
Preparation, surface state and band structure studies of SrTi(1 − x)Fe(x)O(3 − δ) (x = 0–1) perovskite-type nano structure by X-ray and ultraviolet photoelectron spectroscopy
Mohammad Ali Ghaffari,Mohammad Ali Ghaffari,Mohammad Ali Ghaffari,Mark A. Shannon,H. Hui,Ooi Kiang Tan,Ahmad Irannejad +6 more
TL;DR: In this paper, a single cubic perovskite phase of STFx oxide was successfully obtained at 1200°C for 24h by the solid state reaction method, and the effects of iron doping level x (x = 0 − 1) on the crystal structure and chemical state of the STF x oxide have been investigated by X-ray photoelectron spectroscopy and the valence band edges for electronic band gaps were obtained for STF X oxide by ultraviolet photo electromagnetic resonance (UPS).
Journal ArticleDOI
Dependence of magnetoresistivity on charge-carrier density in metallic ferromagnets and doped magnetic semiconductors
TL;DR: In this paper, the authors show that the bulk low-field magnetoresistance (near and above T c) is determined by a single parameter: the charge-carrier density.