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Thermodynamic properties and neutron diffraction studies of silver ferrite AgFeO2

We present thermodynamic and neutron scattering data on silver ferrite AgFeO2. The data imply that strong magnetic frustration Θ/TN∼10 and magnetic ordering arise via two successive phase transitions at T2 = 7 K and T1 = 16 K. At T<T2, two metamagnetic phase transitions at B1∼14 T and B2∼30 T can be identified through the change of slope in the magnetization curve measured up to 53 T. These transitions roughly correspond to an eighth and a quarter of the saturation magnetizations. Unlike for the ‘classical’ delafossite CuFeO2, the wavevector of the magnetic structure is independent of temperature both at T<T2 and at T2<T<T1.