CaCuMn6O12 vs. CaCu2Mn5O12: A comparative studyстатья
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Аннотация:The ferrimagnetic compounds Ca(CuxMn3 - x)Mn4O12 of the double distorted perovskites AC(3)B(4)O(12) family exhibit a rapid increase of the ferromagnetic component in magnetization at partial substitution of square coordinated (Mn3+)(C) for (Cu2+)(C). In the transport properties, this is seen as a change of the semiconducting type of resistivity for the metallic one. The evolution of magnetic properties of Ca(CuxMn3 - x)Mn4O12 is driven by strong antiferromagnetic exchange interaction of (Cu2+)(C) with (Mn3+/Mn (4+))(B) coordinated octahedra. The competing interactions of (Mn3+)(C) with (Mn3+/ Mn4+)(B) lead to the formation of noncollinear magnetic structures that can be aligned by magnetic fields. (c) 2005 Pleiades Publishing, Inc.