The temperature dependence of the energy loss of 624-keV electrons in ferroelectric barium titanate (${\mathrm{BaTiO}}_3$) and triglycine sulfate [(${\mathrm{CH}}_2$${\mathrm{NH}}_2$COOH${)}_3$ ${\mathrm{H}}_2$${\mathrm{SO}}_4$] has been studied with the use of a single-gap magnetic spectrometer. The present measurements confirm the anomalous increase in energy loss of electrons near the Curie temperature $T_C$ and indicate its dependence on (a) the magnitude of the dielectric anomaly at $T_C$, (b) the effect of a dc electric field larger than the coercive field, and (c) the application of an alternating electric field. Probable mechanisms for the origin of the observed phenomenon are discussed.

• Received 23 October 1984

DOI:https://doi.org/10.1103/PhysRevB.32.2835