Magnetic and transport properties of double distorted perovskites CaCuMn6O12 and CaCu2Mn5O12статья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Magnetic and transport properties of double distorted perovskites CaCuMn6O12 and CaCu2Mn5O12 are studied in a range 2-300 K. The leading role in magnetism of these compounds belongs to antiferromagnetic exchange interaction of Cu2+ in square coordination with Mn3+/Mn4+ in octahedral coordination. The values of saturation magnetization indicate that Mn3+ ions in square coordination are coupled ferromagnetically with Mn3+/Mn4+ in octahedral coordination. The colossal magnetoresistance in the pellet samples is due assumingly to intergranular spin-polarized tunneling of current carriers. (C) 2005 Elsevier B.V. All rights reserved.