The interplay between double exchange, super-exchange, and Lifshitz localization in doped manganites

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dc.creatorAlonso, J. L.
dc.creatorFernandez, L. A.
dc.creatorGuinea, F.
dc.creatorLaliena, V.
dc.creatorMartin-Mayor, V.
dc.date2001-11-13
dc.date2002-03-19
dc.date.accessioned2026-07-07T13:06:23Z
dc.date.available2026-07-07T13:06:23Z
dc.descriptionConsidering 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 $y\approx 0.1-0.2$, 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.
dc.description6 pages + 3 postscript figures. Largely extended discussion
dc.identifierhttps://arxiv.org/abs/cond-mat/0111244
dc.identifierhttp://arxiv.org/abs/cond-mat/0111244
dc.identifierPhys. Rev. B 66, 104430 (2002)
dc.identifierdoi:10.1103/PhysRevB.66.104430
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/227767
dc.subjectStrongly Correlated Electrons
dc.subjectMaterials Science
dc.subjectStatistical Mechanics
dc.titleThe interplay between double exchange, super-exchange, and Lifshitz localization in doped manganites
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