Magnetic and Crystal Structure of Ca2Fe2.75O3S0.5Se1.5
A new phase of stoichiometry Ca2Fe2.75O3S0.5Se1.5 has been synthesised as a high purity, 3g batch. The Ca2Fe2.6O3S2 sulfide end member, along with two other solid solution phases Ca2Fe2.65O3S1.5Se0.5 and Ca2Fe2.7O3SSe, all show long range antiferromagnetic order (as confirmed by neutron scattering data previously collected on D2B, experiment 5-31-2732). Ca2Fe2.6O3S2 exhibits one magnetic ordering transition at around 80K and a second between 300K and 373K. Magnetometry data for Ca2Fe2.75O3S0.5Se1.5 between 2K and 300K show evidence for two magnetic transitions- one around 80K and another around 160K. This is in contrast to the other three phases, which only have the 80K transition present in this temperature range. We propose measuring this sample at 5K, 120K and 300K so as to explore the magnetic order below both transitions, between the first and second transition and above both transitions. This is a follow up of the previous D2B experiment 5-31-2732 and will complete the study of the solid solution phases for publication in a high impact journal.
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CLARKE Simon James and SAVVIN Stanislav. (2021). Magnetic and Crystal Structure of Ca2Fe2.75O3S0.5Se1.5. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.EASY-867
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