Electrical transport and percolation in magnetoresistive manganite / insulating oxide composites: case of La0.7Ca0.3MnO3 / Mn3O4

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dc.creatorVertruyen, B.
dc.creatorCloots, R.
dc.creatorAusloos, M.
dc.creatorFagnard, J. -F.
dc.creatorVanderbemden, Ph.
dc.date2007-03-14
dc.date.accessioned2026-07-07T07:51:49Z
dc.date.available2026-07-07T07:51:49Z
dc.descriptionWe report the results of electrical resistivity measurements carried out on well-sintered La0.7Ca0.3MnO3 / Mn3O4 composite samples with almost constant composition of the magnetoresistive manganite phase (La0.7Ca0.3MnO3). A percolation threshold (fc) occurs when the La0.7Ca0.3MnO3 volume fraction is ~ 0.19. The dependence of the electrical resistivity as a function of La0.7Ca0.3MnO3 volume fraction (fLCMO) can be described by percolation-like phenomenological equations. Fitting the conducting regime (fLCMO > fc) by the percolation power law returns a critical exponent t value of 2.0 +/- 0.2 at room temperature and 2.6 +/-0.2 at 5 K. The increase of t is ascribed to the influence of the grain boundaries on the electrical conduction process at low temperature.
dc.description7 pages, 3 figures, accepted for publication in Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/0703367
dc.identifierhttp://arxiv.org/abs/cond-mat/0703367
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/125654
dc.subjectMaterials Science
dc.titleElectrical transport and percolation in magnetoresistive manganite / insulating oxide composites: case of La0.7Ca0.3MnO3 / Mn3O4
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