Dielectric properties of Gd3Ba2Mn2Cu2O12 manganocuprate

TLDR: In this article, the magnetocapacitance and magnetoresistance of Gd3Ba2Mn2Cu2O12 (Gd-3222) have been measured in the temperature range of 2-300 K.

Abstract: The magnetocapacitance and magnetoresistance of Gd3Ba2Mn2Cu2O12 (Gd-3222) has been measured in the temperature range of 2–300 K. The capacitance increases with increasing temperature from 2–300 K, and exhibits a steplike feature at ∼95 K (for 1 kHz). On increasing the probe frequency this step gets broaden and shifts to higher temperature ∼150 K (for 75 kHz). The observation of frequency dependence in capacitance and dielectric loss (tan δ) exhibits Maxwell–Wagner type relaxor behavior in this compound. Magnetocapacitance was observed on the application of magnetic field. No observable magnetoresistance could be observed in this compound, indicating that the magnetoelectric coupling observed from the dielectric constant measurement with and without magnetic field, is of capacitive origin. The results of magnetocapacitance and magnetoresistance of the Gd-3222 compound are presented in the light of current interest in exploring manganite systems for multiferroic properties.