Negative Magnetisation in Ca2PrCr2NbO9
Ca2PrCr2NbO9 is a rare example of a material that shows magnetisation reversal, which is a cross-over from positive to negative magnetisation as a function of temperature. When Ca2PrCr2NbO9 is cooled in an applied field of 0.1 kOe the magnetisation is negative below 50 K but when cooled in fields of 1 kOe or more the magnetisation is positive. To explain this effect we propose that a small net moment in the Cr/Nb sublattice couples either antiferromagnetically or ferromagnetically with the Pr3+ cations depending on the magnitude of the applied field. To test this we need to collect powder neutron diffraction data on D2b at 2 K, 85 K and 300 K to accurately refine the crystal structure and further data on D1b collected in fields ranging between 0 and 10 kOe. This will allow us to study the field dependence of the magnetic structure of Ca2PrCr2NbO9. We therefore request one day of beamtime on instrument D2b followed by two days of beamtime on instrument D1b.
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BATTLE Peter; GILES Emily and SUARD Emmanuelle. (2018). Negative Magnetisation in Ca2PrCr2NbO9. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2550
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