Resonant and non-resonant microwave absorption in the magnetoelectric YCrO 3 through ferro-paraelectric transition

Abstract

An electron paramagnetic resonance (EPR) study in the polycrystalline magnetoelectric YCrO 3 is carried out at X-band (8.8–9.8 GHz) in the 300–510 K temperature range. For all the temperatures, the EPR spectra show a single broad line attributable to Cr 3+ ( S = 3/2) ions. The onset of the ferro-paraelectric transition has been determined from the temperature dependence of three main parameters deduced from the EPR spectra: the peak-to-peak linewidth (Δ H pp), the integrated intensity ( I EPR) and the g-factor; these parameters indicate a behavior in agreement with a diffuse phase transition. Low-field microwave absorption (LFMA) is used to give a further knowledge on this material; where this technique also gives evidence of the ferro-paraelectric transition.