Physics – Condensed Matter – Superconductivity
Scientific paper
2005-11-07
Strongly Correlated Electron Materials: Physics and Nanoengineering, ed. by I. Bozovic and D. Pavuna, Proceedings of SPIE Vol
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1117/12.626267
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.
Chen Fangpei
Chu Cheng-Wei
Sheng Ping
Shulman J.
Tsui S.
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