Non magnetic ions enhance magnetic order in the ludwigiteCo5Sn(O2BO3)2
The ludwigites Co5Sn(O2BO3)2 and Co3O2BO3 belong to a family of oxyborates which presents low dimensional sub-units in the form of three leg ladders in its structure. The sub-units confer to these materials a strong anisotropy in their exchange interactions that provide to the ludwigites several interesting magnetic properties. The pure compound has a ferrimagnetic ordering near 43 K, while the Co5Sn(O2BO3)2 system has long range magnetic order below TN = 82 K. Surprisingly, the magnetic interactions are strengthened by the introduction of non-magnetic ions and the transition temperature of the whole system is the highest critical temperature found so far in the ludwigites. The determination of the magnetic structure in these systems will contribute to a complete understanding of the mechanism of the magnetic interactions in these materials, which in turn can help to understand many properties found in other ludwigites. For that reason we propose to carry out a temperature dependent neutron powder diffraction study on D1B in both compounds the pure one Co3O2BO3 and the doped one Co5Sn(O2BO3)2.
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NUNEZ-REGUEIRO Manuel; RODRIGUEZ VELAMAZAN Jose Alberto and SILVA DE FREITAS Daniele Cristina. (2015). Non magnetic ions enhance magnetic order in the ludwigiteCo5Sn(O2BO3)2. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2404
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