%0 Journal Article
%A Hong, Ka 
%A Solana Madruga, Elena
%A Coduri, Mauro
%A Attfield,  Paul
%T Complex cation and spin orders in the high-pressure ferrite CoFe3O5
%D 2018
%@ 0020-1669
%U https://hdl.handle.net/20.500.14352/92951
%X A ferrite in the Sr2Tl2O5-type MFe3O5 family with M = Co has been synthesized at 12 GPa pressure. Neutron diffraction shows the sample to be Co deficient with composition Co0.6Fe3.4O5. The Co/Fe cation distribution is found to be profoundly different from those of MFe3O5 analogs and lies between normal and inverse limits, as Co2+ substitutes across trigonal prismatic and one of the two octahedral sites. CoFe3O5 shows complex magnetic behavior with weak ferromagnetism below TC1 ≈ 300 K and a second transition to ferrimagnetic order at TC2 ≈100 K. Spin scattering of carriers leads a substantial increase in the hopping activation energy below TC1, and a small negative magnetoresistance is observed at low temperatures.
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