Article

Thermodynamic properties and neutron diffraction studies of silver ferrite AgFeO2

Journal of Physics Condensed Matter (impact factor: 2.55). 12/2009; 22(1):016007. DOI:10.1088/0953-8984/22/1/016007 pp.016007

ABSTRACT 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.

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Keywords

'classical' delafossite CuFeO2
 
magnetization curve
 
neutron scattering data
 
saturation magnetizations
 
silver ferrite AgFeO2
 
strong magnetic frustration Θ/TN~10
 
successive phase transitions
 

Ruediger Klingeler