Crossover to negative dielectric constant in perovskite PrMnO3

Negative dielectric constant materials, once an incumbrance for physicists, are now the stockpiles of unique optical and microwave devices that will also avoid complex geometries. We report the observation of temperature dependent negative dielectric constant (NDC) above 503 K in the perovskite PrMnO3, confirmed through impedance spectroscopy, obeying classical Drude theory. The principle behind the associated negative dielectric loss is explained using the Axelrod mechanism.