Multiple Dielectric Relaxations in CaMn2O4 Polycrystalline Compound

摘要

The dielectric response of the CaMn2O4 polycrystalline compound has been reported in this paper. The orthorhombic room-temperature structure (space group Pbcm) is confirmed by powder X-ray diffraction (XRD). The temperature dependent magnetization M(T) data reveal that antiferromagnetic ordering below T (N) = 220 K. Further decreasing the temperature magnetization shows increasing trend of canted spin structure. Dielectric anomalies are clearly observed at the onset of the magnetic ordering (similar to 220 K) and also at the onset of the canted structure (50 K) in CaMn2O4. Such type of dielectric anomaly around long range order and canted spin transition will correlate the influence of underlying magnetic structure with electric ordering.