Electrical transport in granular metals

In this paper, we studied the frequency-dependent AC conductance of randomly packed stainless steel spheres by means of impedance spectroscopy. Two types of power-law behaviour have been observed: (a) at low frequencies, the dependence of the measured impedance on the applied load; (b) at high frequ...

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Bibliographic Details
Main Authors: Zhai, Chongpu, Hanaor, Dorian, Proust, Gwénaëlle, Gan, Yixiang
Format: Conference Proceeding
Language:English
Subjects:
Critical frequencies
Dependence
Electron tunneling
Resistance
Spectrum analysis
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Summary:In this paper, we studied the frequency-dependent AC conductance of randomly packed stainless steel spheres by means of impedance spectroscopy. Two types of power-law behaviour have been observed: (a) at low frequencies, the dependence of the measured impedance on the applied load; (b) at high frequencies, the dependence of the impedance modulus on frequency. Under different loading conditions, the imaginary parts of the measured conductances exhibit respective peaks at critical frequencies, corresponding to the onset of conductance dispersion. Using these critical points as scaling parameters to normalize the measured conductance, results in the spectra from different loading levels collapsing onto a single master curve. Both the electron tunnelling and capacitive paths among particles contribute to the conduction in granular metallic media, resulting in well-characterized universal behaviour.
ISSN:2100-014X
2101-6275
2100-014X
DOI:10.1051/epjconf/201714005010