Dielectric Anomalies in a New Manganocuprate, Gd3Ba2Mn2Cu2O12
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 (tandelta) matches with glassy behavior observed in many dipolar molecules.
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