Short range correlations in novel ferrimagnetic spinel Mn(Sc0.5M0.5)2O4
ScMn2O4 (space group I41/amd) is structurally analogous to Mn3O4 with half of the 8d Mn sites replaced by the small Sc ion, suppressing the Jahn-teller distortion of the BO6 octahedra. The compound orders ferrimagnetically at T=58K (shubnikov group I41/am'd') but the observed Mn moments are about 3/4 of those found in Mn3O4, and the incommensurate magnetic phase of the undoped compound is not observed. The curie-weiss temperature of nearly 600K indicates that this material is highly frustrated, possibly due to Sc/Mn site disorder disrupting exchange pathways. We have performed an experiment on IN8 to measure the excitations and discovered a strong, detailed diffuse component to the scattered intensity due to short-range correlations. Given the large number of parameters in the spin-hamiltonian and the possibility for short-range ordering of Sc atomic positions, it is extremely important to understand the diffuse scattering and determine whether it is structural, magnetic, or both.
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PRINCEP Andrew; BOOTHROYD Andrew Timothy; DAVIES Nathaniel and WILDES Andrew. (2016). Short range correlations in novel ferrimagnetic spinel Mn(Sc0.5M0.5)2O4. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-42-426
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