A negative dielectric constant in nano-particle materials under an electric field at very low frequencies

Abstract

The significance of a negative dielectric constant has long been recognized. We report here the observation of a field-induced large negative dielectric constant of aggregates of oxide nano-particles at frequencies below ~ 1 Hz at room temperature. The accompanying induced charge detected opposes the electric field applied in the field-induced negative dielectric constant state. A possible collective effect in the nano-particle aggregates is proposed to account for the observations. Materials with a negative dielectric constant are expected to provide an attraction between similar charges and unusual scattering to electromagnetic waves with possible profound implications for high temperature superconductivity and communications.

References in corpus (2)

• Evidence for power-law frequency dependence of intrinsic dielectric response in the CaCu${}_3$Ti${}_4$O${}_{12}$
• The Droplet State and the Compressibility Anomaly in Dilute 2D Electron Systems

Cited by in corpus (2)

• High Temperature superconductivity in a hyperbolic geometry of complex matter from nanoscale to mesoscopic scale
• Crossover to negative dielectric constant in perovskite PrMnO3