Negative capacitance in (FeCoZr)-(PZT) nanocomposite films

In this work, attention was focused on the inductive contribution to the real part of admittance G(T, f) in (Fe0.45Co0.45Zr0.10)x(PZT)(1−x) nanocomposite films deposited in a mixed argon-oxygen atmosphere. The observed G(x, f, T) dependences for the films on the dielectric side of the insulator-meta...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2013-03, Vol.46 (12), p.125304-1-9
Main Authors: Ko tunowicz, T N, Fedotova, J A, Zhukowski, P, Saad, A, Fedotov, A, Kasiuk, J V, Larkin, A V
Format: Article
Language:English
Subjects:
Argon-oxygen atmospheres
Capacitance
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductivity phenomena in semiconductors and insulators
Cross-disciplinary physics: materials science
rheology
Deposition
Electron states
Electronic transport in condensed matter
Exact sciences and technology
Materials science
Metal-insulator transitions and other electronic transitions
Mobility edges
hopping transport
Nanocomposites
Nanocrystalline materials
Nanomaterials
Nanoparticles
Nanopowders
Nanoscale materials and structures: fabrication and characterization
Nanostructure
Numerical control
Physics
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Summary:In this work, attention was focused on the inductive contribution to the real part of admittance G(T, f) in (Fe0.45Co0.45Zr0.10)x(PZT)(1−x) nanocomposite films deposited in a mixed argon-oxygen atmosphere. The observed G(x, f, T) dependences for the films on the dielectric side of the insulator-metal transition demonstrated the negative capacitance (NC) effect that was maximal for the nanocomposites with 0.40 < x < 0.60, where the metallic FeCoZr nanoparticles were totally oxidized. The NC effect was explained by a specially developed model for the ac hopping conductance of the electrons between the fully oxidized nanoparticles embedded in the PZT matrix. In accordance with the model, under the determined conditions the observed structure of nanocomposites led to an increase in the hopping electron mean lifetime on nanoparticles and hence to the possibility of positive angles of the phase shifts and a proper NC (inductive-like contribution) effect.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/46/12/125304