VOLTAGE-CURRENT CHARACTERISTICS AND MAGNETORESISTANCE OF BiPbSrCaCuO SILVER CLAMP THICK FILM

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Abstract
Bi(2223) silver clamp thick film with Jc=1.5×104A/cm2 at 77 K and 0 T was fabricated by a physical deposition method. Voltage-current characteristics and magnetoresistance were investigated in detail at low magnetic fields. It can be concluded that the transport Jc limitation of the present samples was still dominated by weak links although their connectivity has been greatly improved in comparison with bulk materials. The weak links may exert an effective pinning on flux lines. When the transport current exceeds the critical current of weak links their resistances change, just as does the flux flow resistance of traditional type-II superconductors. A history effect of the magnetoresistivity below a certain field (about 1.0 kG) was found at various constant measuring currents and can be ascribed to the Jc (H) characteristics and flux trapping both in the weak link network and the grains.

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