Frequency dependence of dielectric anomaly around Neel temperature in bilayer manganite Pr(Sr0.1Ca0.9)2Mn2O7

摘要

A novel frequency dependence of anomaly in dielectric constant versustemperature plot, around the Neel temperature T_N (~150 K), has been observedin a single crystal of bilayer manganite Pr(Sr0.1Ca0.9)2Mn2O7. The anomaly inthe permittivity (epsilon'||c) occurs at a temperature T_f which moves within atemperature window (delT_f) of ~40 K around T_N for a frequency range 50 kHz-5MHz. The capacitive component Cp of the dielectric response exhibits a clearyet broad feature around T_N which establishes the intrinsic capacitive natureof the anomaly.