Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-09-12
J. Phys.: Condens. Matter 22 (2010) 075601
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 2 figures (published version)
Scientific paper
10.1088/0953-8984/22/7/075601
In the manganites $RE_{1-x}AE_{x}$MnO$_{3}$ ($RE$ and $AE$ being rare-earth and alkaline-earth elements, respectively) the random distribution of $RE^{3+}$ and $AE^{2+}$ induces random, but correlated, shifts of site energies of charge carriers in the Mn sites. We consider a realistic model of this diagonal disorder, in addition to the double-exchange hopping disorder, and investigate the metal-insulator transition as a function of temperature, across the paramagnetic-ferromagnetic line, and as a function of doping $x$. Contrary to previous results, we find that values of parameters, estimated from the electronic structure of the manganites, are not incompatible with the possibility of a disorder induced metal to insulator transition accompanying the ferromagnetic to paramagnetic transition at intermediate doping ($x\sim0.2-0.4$). These findings indicate clearly that substitutional disorder has to be considered as an important effect when addressing the colossal magnetoresistance properties of manganites.
Castro Eduardo V.
dos Santos Joao M. B. Lopes
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