Magnetische Wechselwirkungen in Inselstrukturen ternärer Cobaltchalkogenide. Die Spinstrukturen von Na6CoS4 und Na6CoSe4 |
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Authors: | W. Bronger,W. Koelman,P. Mü ller |
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Abstract: | Magnetic Interactions in Ternary Cobalt Chalcogenides containing Isolated Tetrahedral Cobalt Anionic Groups. The Spin Structures of Na6CoS4 and Na6CoSe4 The sodium cobalt chalcogenides Na6CoS4 and Na6CoSe4 are characterized by isolated [CoX4]-units. Despite the large distances of more than 6 Å between the cobalt ions magnetic inter-actions at low temperatures lead to threedimensionally ordered spin structures, that were determined from neutron diffraction experiments. The magnetic structure can be described in the Shubnicov group P2abc21 with a unit cell that is four times as large as the crystallographic cell. The magnetic moments of both compounds correspond to the value expected for three unpaired electrons per Co2+ ion. |
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Keywords: | Alkali transition metal chalcogenides magnetic structures neutron diffraction |
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