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通过对在不同外磁场下Bi1.9Pb0.3Sr2.0Ca1.7Mg0.3Cu3.1Ox超导块材的交流磁化率的测量,获得了样品内晶粒间和晶粒内对外场的不问响应范围.通过与粉状样品实验结果的比较和X光分析,认为块状样品在温度为100K左右出现的抗磁台阶是样品内晶粒间超导弱连接的一种抗磁效应.对弱连接区有效钉扎力Fp和临界电流密度Jc与外场H的关系进行了讨论.
By measuring the AC susceptibility of Bi1.9Pb0.3Sr2.0Ca1.7Mg0.3Cu3.1Ox superconducting blocks under different external magnetic fields, the response range of the intergranular and intragranular to external fields in the sample was obtained. By comparison with the experimental results of powdered samples and X-ray analysis, it is considered that the anti-magnetic steps appearing at a temperature of about 100K in a bulk sample are a kind of diamagnetic effect of the weak inter-crystal grains in the sample. The relationship between the effective pinning force Fp and the critical current density Jc in the weak junction and the field H was discussed.