In this work, attention was focused on the inductive contribution to the real part of admittance G(T , f ) in (Fe 0.45 Co 0.45 Zr 0.10 ) 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 θ and a proper NC (inductive-like contribution) effect.
We report the investigation of a real part of the admittance σ of granular nanocomposites (Fe 0.45 Co 0.45 Zr 0.10) x (Al 2 O 3) 1−x with 0.30 < x < 0.70 in the dielectric (hopping) regime. An analysis of the σ(T, f, x) dependences in the as-deposited and annealed films over the temperature 77 K < T < 300 K and frequency 50 < f < 10 6 Hz ranges displayed the predominance of an activation (hopping) conductance mechanism with dσ/ dT > 0 for the samples below the percolation threshold x C ≈ 0.76 ± 0.05. Based on the earlier models for hopping AC conductance, computer simulation of the frequency coefficient α f of hopping conductance depending on the probability of jump p, frequency f , and also on the shape of σ(f) curve was performed. The experimental and simulation results revealed a good agreement.
A study of magnetotransport in the n-Si/SiO 2 /Ni nanostructures with granular Ni nanorods in SiO 2 pores was performed over the temperature range 2-300 K and at the magnetic fields induction up to 8 T. The n-Si/ SiO 2 /Ni Schottky nanostructures display the enhanced magnetoresistive effect at 25 K due to the impurity avalanche mechanism.
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