Title
Relation between structure, charge ordering and magnetotransport properties in <tex>$Nd_{0.5}Ca_{0.5}Mn_{1-x}Cr_{x}O_{3}$</tex> manganitesRelation between structure, charge ordering and magnetotransport properties in <tex>$Nd_{0.5}Ca_{0.5}Mn_{1-x}Cr_{x}O_{3}$</tex> manganites
Author
Faculty/Department
Faculty of Sciences. Physics
Research group
Electron microscopy for materials research (EMAT)
Publication type
article
Publication
Amsterdam,
Subject
Physics
Source (journal)
Journal of magnetism and magnetic materials. - Amsterdam
Source (book)
Symposium G Material Physics Issues and Applications of Magnetic Oxides, at the E-MRS Spring Meeting, JUN 01-04, 1999, Strasbourg, France
Volume/pages
211(2000):1-3, p. 105-110
ISSN
0304-8853
ISI
000085772100017
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The relationships between incommensurability, charge ordering and magnetotransport properties in Nd0.5Ca0.5Mn1-xCrxO3 manganites have been studied by electron diffraction and lattice imaging versus temperature with 0.02 less than or equal to x less than or equal to 0.07. All compositions show an incommensurate superstructure over the whole temperature domain, despite the fact that they are ferromagnetic and conductive below 140 K, The q-vector (1/2 - delta)a* decreases with increasing temperature for all compositions x. For a given temperature q also decreases with x. Lattice images obtained at low temperature give a clear view of the characteristics of the incommensurate structure. They also provide a better understanding of the charge ordering process. The low-temperature form of the Cr-doped manganites is not a perfectly doubled cell [[2a(p)root 2 x 2a(p) x a(p)root 2]], but defects inducing a tripled cell occur pseudo-periodically. (C) 2000 Elsevier Science B.V. All rights reserved.
E-info
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