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利用交流互感法,在不同静磁场H_(dc)条件下,对块状烧结样品和粒度不同的粉末超导样品的交流磁化率X随温度T的变化进行了研究,某些样品的X～T特性曲线在起始转变温度下出现两个不同斜率的变化段;在不同静磁场H_(dc)条件下,对R-T特性曲线的低温拖尾段进行了研究,研究结果表明低场下,X～T和R～T的低温部分发生显著变化。对用块状烧结yBa_2Cu_3O_(7-δ)超导体制做的宏观“微桥”的临界电流I随静磁场H_(lc)的变化进行了研究,发现在H_(lc)=30O_e的低场下,I_e降低了约70～80%。并根据弱连接颗粒超导模型对上面结果作了定性解释。
The exchange magnetic susceptibility (X) of bulk sintered samples and powdery superconducting powders with different particle sizes under different static magnetic field H_ (dc) conditions were investigated by means of alternating current induction method. The results of X ~ T The characteristic curve shows two different slope changing sections at the initial transition temperature. The low temperature tailing section of the RT characteristic curve under different static magnetic field H_ (dc) conditions is studied. The results show that under the low field X ~ T and R ~ T part of the low temperature changes significantly. The critical current I of the macroscopic “micro-bridge” made of bulk sintered yBa_2Cu_3O_ (7-δ) superconductors is studied with the change of the static magnetic field H_ (lc). It is found that under the low field of H_ (lc) = 30O_e, I_e is reduced by about 70-80%. According to the weakly connected particle superconductivity model, the above results were qualitatively explained.