ホール効果によるBi-2212/Ag超伝導テープ線材の異常電流分布

抄録

I-V characteristics and the distribution of electric potential were measured for Bi-2212/Ag composite tape in magnetic fields of various directions. An anomalous distribution of electric potential was observed especially in the magnetic fields perpendicular to the tape surface. Along the current direction in the vicinity of both edges of the superconducting oxide layer, a large voltage was measured. However, zero voltage was monitored in the middle area of samples. Large voltage was also measured across the current direction around both edges. These voltages are proportional to both the value of the applied current below I_c and the magnetic field component perpendicular to the tape surface. To explain this anomalous distribution of electric potential, we propose a model based on the Hall effect in silver substrate and current transfer from silver to superconductor.