Detection of the magnetic and electric transitions by electron paramagnetic resonance and low-field microwave absorption in the magnetoelectric Pb(Fe_(0.5)Ta_(0.5))O_3

摘要

An electron paramagnetic resonance (EPR) study of Pb(Fe_(0.5)Ta_(0.5))O_3 powder samples in perovskitetype structure at X-band (8.8–9.8 GHz), in the 120–300K temperature range, is presented. For all the temperatures, the EPR spectra show a single broad line attributable to Fe~(3+) ions. The onset of the ferro-paraelectric and antiferro-paramagnetic transitions has been determined from the temperature dependence of parameters deduced from the EPR spectra: the peak-to-peak linewidth (ΔH_(pp)), the resonance field (Hres) and the integrated intensity (I_(EPR)). Low-field microwave absorption (L_(FMA)) is used to give further knowledge on this material; where this technique also gives evidence of the magnetic and electric orders.