Double exchange alone does not explain the resistivity of La1-xSrxMnO3.
TLDR
It is proposed that in addition to double-exchange physics a strong electron-phonon interaction arising from the Jahn-Teller splitting of the outer Mn $d$ level plays a crucial role.Abstract:
The ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ system with $02\ensuremath{\lesssim}x\ensuremath{\lesssim}04$ has traditionally been modeled with a ``double-exchange'' Hamiltonian in which it is assumed that the only relevant physics is the tendency of carrier hopping to line up neighboring spins We present a solution of the double-exchange model, show it is incompatible with many aspects of the data, and propose that in addition to double-exchange physics a strong electron-phonon interaction arising from the Jahn-Teller splitting of the outer Mn $d$ level plays a crucial roleread more
Citations
More filters
Journal ArticleDOI
Dynamical mean-field theory of strongly correlated fermion systems and the limit of infinite dimensions
TL;DR: The dynamical mean field theory of strongly correlated electron systems is based on a mapping of lattice models onto quantum impurity models subject to a self-consistency condition.
Journal ArticleDOI
Colossal Magnetoresistant Materials: The Key Role of Phase Separation
TL;DR: In this paper, a large variety of experiments reviewed in detail here contain results compatible with the theoretical predictions, including phase diagrams of manganite models, the stabilization of the charge/orbital/spin ordered half-doped correlated electronics (CE)-states, the importance of the naively small Heisenberg coupling among localized spins, the setup of accurate mean-field approximations, and the existence of a new temperature scale T∗ where clusters start forming above the Curie temperature, the presence of stripes in the system, and many others.
Journal ArticleDOI
Percolative phase separation underlies colossal magnetoresistance in mixed-valent manganites
Masatomo Uehara,Masatomo Uehara,Shigeo Mori,Shigeo Mori,Shigeo Mori,Cheng-Hsuan Chen,Cheng-Hsuan Chen,Sang-Wook Cheong,Sang-Wook Cheong,Sang-Wook Cheong +9 more
TL;DR: In this article, it was shown that the magnetoresistive response increases dramatically when the Curie temperature (T C) is reduced, and that the massive magnetoresistance in low-T C systems can be explained by percolative transport through the ferromagnetic domains; this depends sensitively on the relative spin orientation of adjacent magnetoric domains which can be controlled by applied magnetic fields.
Journal ArticleDOI
REVIEW ARTICLE: Colossal magnetoresistance
TL;DR: In this paper, the authors review recent experimental work falling under the broad classification of colossal magnetoresistance (CMR), which is magnetoreduction associated with a ferromagnetic-toparamagnetic phase transition.
Journal ArticleDOI
Critical features of colossal magnetoresistive manganites
TL;DR: In this paper, the phase separation phenomenon on various time-scales (from static to dynamic) and the enhanced phase fluctuation with anomalous reduction in the transition temperatures of the competing phases (and hence in the bicritical-point temperature).
References
More filters
Book
Quantum Theory of Solids
TL;DR: In this paper, the Hartree-Forck approximation is used to calculate energy bands and Fermi Surfaces for semiconductor crystals. But the results of the energy bands do not cover the entire crystal lattice.