Correlations between micro- and nanostructures and magnetic transitions in the Ru-doped Sm0.2Ca0.8MnO3 manganites

被引：9
作者：
Hervieu, M
Martin, C
Maignan, A
Raveau, B
机构：
[1] ISMRA Univ Caen, Associe CNRS, UMR 6508, Lab CRISMAT, F-14050 Caen, France
[2] Univ Caen, F-14050 Caen, France
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2000年 / 155卷 / 01期
关键词：
D O I：
10.1006/jssc.2000.8882
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The electron microscopy study of the Ru-doped manganites Sm0.2Ca0.8Mn1-xRuxO3 (0 less than or equal to x less than or equal to 0.10) shows that the magnetic properties of these materials are strongly correlated to their microstructure, Charge ordering induced by Mn-site doping is shown for the first time, in contrast to what is generally observed. It is shown that Ru-doping paradoxically favors the simultaneous development of ferromagnetic orthorhombic domains and charge-ordered antiferromagnetic domains at low temperature, starting from a monophasic orthorhombic paramagnetic sample at room temperature. This structural phase separation phenomenon at low temperature is explained in terms of two antagonist effects introduced by Ru5+ Substitution: ferromagnetic superexchange interactions and Mn valency. (C) 2000 Academic Press.
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页码：15 / 21
页数：7
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