Ca-site substitution induced a metal-insulator transition in manganite CaMnO3
authors Sousa, D; Nunes, MR; Silveira, C; Matos, I; Lopes, AB; Jorge, MEM
nationality International
journal MATERIALS CHEMISTRY AND PHYSICS
author keywords ceramics; electron microscopy; X-ray diffraction; electrical conductivity
keywords COLOSSAL MAGNETORESISTANCE; TRANSPORT PROPERTIES; MAGNETIC-PROPERTIES; ROOM-TEMPERATURE; CHARGE; PEROVSKITES; HO; ND0.5CA0.5MNO3; MANGANATES; OXIDES
abstract A systematic study of the A-site doping in Mn(IV)-rich perovskite manganites Ca1-xHoxMnO3, over a large homogeneity range (0.1 <= x <= 0.4), has been performed. A significant increase in the lattice parameters indicated the presence of mixed valence state of Mn: Mn3+ and Mn4+. The substitution of calcium by holmium also induces strong changes in the electrical properties. We found that small Ho concentration produces an important decrease in the electrical resistivity and induces an electrical transition, the temperature corresponding to the metal-insulator transition (T-M1) shifts with the holmium content. This electrical behavior is attributed to the Mn3+ ions content and a charge order effect. (C) 2007 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 0254-0584
year published 2008
volume 109
issue 2-3
beginning page 311
ending page 319
digital object identifier (doi) 10.1016/j.matchemphys.2007.11.032
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000255692100024
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journal impact factor 3.408
5 year journal impact factor 2.884
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