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Electrical impedance of superconductor/polymer composites

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Electrical impedance measurements were carried out on high-T c superconducting ceramic/polymer composite materials, in which superconducting particles are embedded in a polymer matrix. The results for the impedance magnitude and phase angle versus frequency (1 kHz-1 MHz), temperature (50–290 K) and volume percentage of superconductor (0–70%) are presented. The results reveal that the a.c. electrical properties of the new composite materials go through a large change at volume percentage of powder filler around 40%, which indicates that particle-particle contacts are partially formed. Far below this composition the composite is an insulator, and above this composition the composite behaves as a semiconductor. No marked transition in impedance and phase angle was observed when the material went through the superconducting transition temperature.

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Du, J., Unsworth, J. & Crosby, B.J. Electrical impedance of superconductor/polymer composites. J Mater Sci: Mater Electron 3, 227–231 (1992).

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  • Polymer
  • Transition Temperature
  • Composite Material
  • Electrical Property
  • Electronic Material