YBCO単結晶および薄膜での輸送臨界電流と抵抗状態

抄録

Direct measurements of transport critical current and resistive state in YBCO single crystal microbridges and thin films have been performed, using pulse technique with microsecond current pulses. We have obtained critical currents values up to 10⁵A/cm² at 80K in zero field for single crystals and more than 10⁶A/cm² for thin films. Data on field dependence of ρ_f are presented and preliminary assumptions on the difference in flux flow mechanism in YBCO single crystals and thin films are made.