The Anomalous Behavior of the Coercive Field in Lossy KH₂PO₄

Abstract

The D-E hysteresis loops have been observed between 10⁻² Hz and 60 Hz for lossy KH₂PO₄ crystals with different dielectric losses at room temperature. The coercive fields of these crystals show maxima at the same temperature T_p characteristic of the frequency of the applied field. In a certain temperature region below T_p the coercive field increases with decreasing the frequency of the applied field. It turns out that these anomalous temperature and frequency dependences of the coercive field are closely related with the formation of the internal bias field due to the locally relaxing defect.