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本文描述了用锁相放大器及交流双回路四端法来测量Y·Ba·Cu·O型高T_c超导材料的电阻—温度(R—T)曲线的细节,获得了满意的结果。
In this paper, the details of measuring the resistance-temperature (R-T) curve of a Y. Ba.Cu.O high T_c superconducting material by using a lock-in amplifier and a four-terminal AC double loop method are described. Satisfactory results are obtained.