Influence of chemical prehistory on the colossal magnetoresistance of La0.7Ca0.3MnO3 ceramicsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Evolution of magnetoresistance at H = 1.5 T during sintering of ceramics is studied for La0.7Ca0.3MnO3 samples obtained using solid state (SS) synthesis and freeze-drying (FD) methods. Significant enhancement of magnetoresistance peak values and lowering of peak temperature for dense SS samples can be related to larger oxygen non-stoichiometry due to complicated oxygen diffusion or influence of La-doped MnOx inclusions, generating new pinning centers. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.