Thermodynamic properties and neutron diffraction studies of silver ferrite AgFeO₂

A. Vasiliev (1) , O. S. Volkova (1) , Igor Presniakov (1) , Alexey Baranov (1, 2) , Gérard Demazeau (2) , Jean-Marc Broto (3) , Marius Millot (3) , N. Leps (4) , R. Klingeler (4) , B. Büchner (4) , M. B. Stone (5) , A. Zheludev (6)

1 Chair of Radiochemistry, Department of Chemistry
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
3 LNCMI-T - Laboratoire national des champs magnétiques intenses - Toulouse
4 IFW Dresden - Leibniz Institute for Solid State and Materials Research
5 ORNL - Oak Ridge National Laboratory [Oak Ridge]
6 LNS - Laboratory for Neutron Scattering and Imaging [Paul Scherrer Institute]

We present thermodynamic and neutron scattering data on silver ferrite AgFeO₂. The data imply that strong magnetic frustration Θ/T_N~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.

Mots clés: Crystalline solids; Magnetism; Neutron diffraction; Inorganic compounds

Domaines: Matériaux

A. Vasiliev, O. S. Volkova, Igor Presniakov, Alexey Baranov, Gérard Demazeau, et al.. Thermodynamic properties and neutron diffraction studies of silver ferrite AgFeO₂. Journal of Physics: Condensed Matter, 2010, 22 (1), 016007 (6 p.). ⟨10.1088/0953-8984/22/1/016007⟩. ⟨hal-00462348⟩