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- W2034534779 abstract "Considering the disorder caused in manganites by the substitution of Mn by Fe or Ga, we accomplish a systematic study of doped manganites begun in previous papers. To this end, a disordered model is formulated and solved using the Variational Mean Field technique. The subtle interplay between double exchange, super-exchange, and disorder causes similar effects on the dependence of T_C on the percentage of Mn substitution in the cases considered. Yet, in La$_{2/3}$Ca$_{1/3}$Mn$_{1-y}$Ga$_y$O$_3$ our results suggest a quantum critical point (QCP) for $yapprox 0.1-0.2$, associated to the localization of the electronic states of the conduction band. In the case of La$_x$Ca$_x$Mn$_{1-y}$Fe$_y$O$_3$ (with $x=1/3,3/8$) no such QCP is expected." @default.
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- W2034534779 date "2002-09-30" @default.
- W2034534779 modified "2023-10-18" @default.
- W2034534779 title "Interplay between double-exchange, superexchange, and Lifshitz localization in doped manganites" @default.
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- W2034534779 doi "https://doi.org/10.1103/physrevb.66.104430" @default.
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