Crossover to negative dielectric constant in perovskite PrMnO3

TL;DR

This paper reports the observation of temperature-dependent negative dielectric constant in PrMnO3 above 503 K, highlighting its potential for optical and microwave device applications.

Contribution

It presents the first experimental evidence of negative dielectric constant in PrMnO3 at high temperatures, confirmed by impedance spectroscopy and explained via classical Drude theory.

Findings

Negative dielectric constant observed above 503 K

Confirmed through impedance spectroscopy

Explained using classical Drude theory

Abstract

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.