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Article Dans Une Revue Materials Letters Année : 2009

Magnetic and electrical behaviour of La0.67Ba0.33Mn1−xFexO3 perovskites

Résumé

(La0.67Ba0.33)Mn1-xFexO3 manganites compounds have been prepared by doping up to 20% of Fe at the Mn site. As previously reported in the literature paramagnetic (PM) to ferromagnetic (FM) phase transition has been observed in materials with low Fe doping (<= 10%). In our x = 0 and x = 0.05 compounds the Curie temperature (T-C) is close to room temperature. Above 10% Fe amount, specimens exhibit a glass magnetic behaviour with a spin- or cluster-like freezing process that can be related to a loss of ferromagnetic double exchange interaction. Below 10% of Fe3+ doping electrical-resistivity measurement shows metal - semiconductor transition with a maximum peak of resistivity (rho(max)) at a temperature T-P close to T-C. Above 10% of Fe3+ doping amount the materials exhibit only semiconductor behaviour. Both T-C and T-P decrease with doping rates with an increasing difference in temperature (T-P, being lower than T-C). Results are consistent with a reduction of the number of available hopping sites for the Mn e(g)(up arrow) electron due to substitution of Mn3+ by Fe3+ that suppress the double exchange (DE) interactions. (C) 2009 Elsevier B.V. All rights reserved.

Domaines

Matériaux

Dates et versions

hal-01067576 , version 1 (23-09-2014)

Identifiants

Citer

M. Baazaoui, S. Zemni, Michel Boudard, H. Rahmouni, A. Gasmi, et al.. Magnetic and electrical behaviour of La0.67Ba0.33Mn1−xFexO3 perovskites. Materials Letters, 2009, 63 (24-25), pp.2167-2170. ⟨10.1016/j.matlet.2009.07.019⟩. ⟨hal-01067576⟩
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