The spin-reorientation transition of layered perovskite oxide CaNdFeO 4 has been investigated through powder x-ray and neutron diffraction, magnetic susceptibility, specific heat and 57Fe Mössbauer spectrum measurements. This oxide presents orthorhombic symmetry (space group: Bmab) with lattice parameters at room temperature a = 5.4212(1) Å, b = 5.4799(2) Å, and c = 12.0617(2) Å. Through its magnetic susceptibility and specific-heat measurements, two magnetic anomalies were found at around 7 and 35 K. From 57Fe Mössbauer spectra and neutron diffraction profiles of CaNdFeO4, it has been elucidated that the anomalies observed at 7 and 35 K correspond to the antiferromagnetic ordering of the Nd3+ ion and a change in the direction of magnetic moment of the Fe3+ ion, respectively. The magnetic structures above and below the spin-reorientation transition temperature were determined. The spin-reorientation transition observed in CaNdFeO4 has been induced by the onset of local magnetic interactions between the neodymium and iron sublattices.
ASJC Scopus subject areas
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials