Abstract
A series of superconductor/polymer composites is made using high Tc YBa2Cu3O7−x (Y-123) phase and Linear Low Density Polyethylene (LLDPE). The resistivity of the composites is measured as a function of temperature between 293 K and 400 K. A large positive temperature coefficient (PTC) of resistance is observed near 395 K. An attempt has been made to relate the percolation behavior of the YBCO–LLDPE composites and the thermal expansion of the LLDPE matrix. The intensity of the PTC effect for these composites was found to be as large as eight orders of magnitude.
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