Abstract
The crystal and magnetic structures of the perovskite-related materials SrLaFeSnO 6 and SrLaNiSbO 6 have been refined using neutron diffraction data collected at room temperature and 1.7 K. SrLaFeSnO 6 adopts the orthorhombic space group Pbnm with disordered Sr La and Fe Sn cations and is magnetically ordered as a G-type antiferromagnet at 1.7 K. SrLaNiSbO 6 differs in that a partial order of the Ni and Sb cations results in the space group P2 1 n and a Type I antiferromagnetic structure. The magnetic susceptibility shows a maximum at 39 and 26 K, respectively, but there is a significant difference between the field-cooled and zero-field-cooled susceptibility above these temperatures. This effect persists to at least 250 K in SrLaFeSnO 6. An explanation is developed in terms of magnetic clusters which increase in size with decreasing temperature until a long-range ordered structure is finally achieved.
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