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Article overview
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The interplay between double exchange, super-exchange, and Lifshitz localization in doped manganites | J. L. Alonso
; L. A. Fernandez
; F. Guinea
; V. Laliena
; V. Martin-Mayor
; | Date: |
13 Nov 2001 | Subject: | Strongly Correlated Electrons; Statistical Mechanics; Materials Science | cond-mat.str-el cond-mat.mtrl-sci cond-mat.stat-mech | 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. | Source: | arXiv, cond-mat/0111244 | Services: | Forum | Review | PDF | Favorites |
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