Dielectric Anomalies in a New Manganocuprate, Gd3Ba2Mn2Cu2O12

TL;DR

This study investigates the dielectric properties of a newly synthesized manganocuprate compound, revealing glassy behavior and temperature-dependent dielectric anomalies between 100 and 300 K.

Contribution

It reports the dielectric response of Gd3Ba2Mn2Cu2O12, a new manganocuprate, highlighting two temperature peaks and frequency-dependent shifts indicating glassy dipolar behavior.

Findings

Two dielectric peaks at 150 K and 210 K

Peaks shift to higher temperatures with increasing frequency

Dielectric behavior resembles glassy dipolar systems

Abstract

Dielectric response has been studied for a new manganocuprate, Gd3Ba2Mn2Cu2O12 (Gd3222) as a function of temperature (100 - 300 K) and frequency (75 kHz to 1 MHz). The dielectric constant (e) exhibits a two step increase (two peaks) in e(T) with increasing temperature from 100 to 300 K. The first peak is seen around 150 K and the second one around 210 K (both for 75 kHz). Increasing frequency shifts both the peaks to higher temperature side. The behavior of dielectric constant (e) and dielectric loss (tan_delta) matches with glassy behavior observed in many dipolar molecules.