Crossover to Negative Dielectric Constant in Perovskite PrMnO3

• Published in: Physica status solidi. A, Applications and materials science Vol. 217; no. 17
• Main Authors: Balu, Santhosh Kumar, Shanker, Nagararaj Praveen, Manikandan, Marimuthu, Aparnadevi, Natarajan, Mukilraj, Thayanithi, Manimuthu, Periyaswamy, Venkateswaran, Chakravarthy
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01-09-2020
• Subjects: capacitive to inductive; Computer architecture; Crossovers; Dielectric loss; impedance spectroscopy; negative dielectric constants; negative index materials; Permittivity; Perovskites; Praseodymium compounds; Temperature dependence
• ISSN: 1862-6300; 1862-6319
• DOI: 10.1002/pssa.202000230

Negative dielectric constant (NDC) materials have the potential for unique optical and microwave applications and their use can greatly reduce the complexity of device architecture. The observation of temperature‐dependent NDC above 503 K in the perovskite PrMnO3 is reported which obeys the classical Drude theory. This is confirmed through impedance spectroscopy, and the principle behind the associated negative dielectric loss is explained using the Axelrod mechanism.
Negative dielectric constant (NDC) materials, once an incumbrance for physicists now become the stockpiles of unique optical and microwave devices and their use will have an impact in the design of less complex device architectures. Herein, the phenomenon NDC in PrMnO3 as a function of temperature is reported, associated with capacitive‐to‐inductive transition obeying the Drude model.