Hopping Conductance in Nanocomposites (Fe_{0.45}Co_{0.45}Zr_{0.10})_{x}(Al_2O_3)_{1 - x} Manufactured by Ion-Beam Sputtering of Complex Target in Ar+O_2 Ambient Gas

• Authors: T. Kołtunowicz , P. Zhukowski , V. Fedotova , A. Saad , A. Fedotov
• Languages of publication: EN

Abstracts

EN

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_2O_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.

Keywords

EN

79.20.Rf; 73.22.-f; 84.37.+q; 72.20.Ee

Discipline

• 84.37.+q: Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.)
• 73.22.-f: Electronic structure of nanoscale materials and related systems
• 79.20.Rf: Atomic, molecular, and ion beam impact and interactions with surfaces(for atomic and molecular beam techniques, see 37.20.+j; see also 34.35.+a Interactions of atoms and molecules with surfaces)
• 72.20.Ee: Mobility edges; hopping transport

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2011
• Volume: 120
• Issue: 1
• Pages: 39-42

Dates

published

2011-07

Contributors

author

T. Kołtunowicz

• Lublin University of Technology, Nadbystrzycka 38a, 20-618 Lublin, Poland

author

P. Zhukowski

• Lublin University of Technology, Nadbystrzycka 38a, 20-618 Lublin, Poland

author

V. Fedotova

• Scientific-Practical Material Research Centre NAS of Belarus, P. Brovki 19, 220072 Minsk, Belarus

author

A. Saad

• Al-Balqa Applied University, P.O. Box 2041, Amman 11953, Jordan

author

A. Fedotov

• Belarussian State University, Independence 4, 220030 Minsk, Belarus

References

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• 7. A. Saad, J. Kasiuk, J. Fedotova, E. Szilagyi, J. Przewoznik, Cz. Kapusta, M. Marszalek, Hyperfine Interact. 189, 111 (2009)
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Identifiers

DOI

10.12693/APhysPolA.120.39