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Magnetic and transport properties of double distorted perovskites CaCuMn6O12 and CaCu2Mn5O12 |
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| Authors: | O Volkova K Klimov O Savelieva N Tristan E Goodilin B Buechner A Vasiliev |
| Institution: | 1. Materials Science Faculty, Moscow State University, Moscow 119992, Russia;2. Leibniz Institue for Solid State and Materials Research, Dresden D-01171, Germany;3. Low Temperature Physics Department, Moscow State University, Moscow 119992, Russia |
| Abstract: | 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. |
| Keywords: | 75 25 +z 75 47 Gk |
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