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首页> 外文期刊>Journal of Research of the National Institute of Standards and Technology >NEW SOURCE OF SUPERCONDUCTOR MEASUREMENT MISINTERPRETATION DISCOVERED
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NEW SOURCE OF SUPERCONDUCTOR MEASUREMENT MISINTERPRETATION DISCOVERED

机译：发现了超导体测量误解的新来源

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摘要

As part of NIST's program to develop standard measurement techniques for superconductors, two NIST scientists have identified and studied a new source of misinterpretation in critical current measurements of superconductors. The critical current is the maximum current a conductor can carry before a quench, when it reverts to the normal resistive state. Researchers can tell when the critical current is reached by measuring the resistive voltage on pairs of voltage taps soldered to the superconductor wires.However, the NIST scientists discovered that anomalous inductive voltages can be induced in the loop formed by the voltage taps. The inductive voltages vary systematically with current, current sweep direction (increasing or decreasing), applied magnetic field, and whether the specimen was driven into the normal state in an immediately preceding measurement. Furthermore, the decay time of the inductive voltage signal after ending the current ramp is longer near the onset of the resistive transition. These decay times are even longer during a superconductors first current sweep after a quench.
机译：作为NIST开发用于超导体的标准测量技术的计划的一部分，两名NIST科学家已经确定并研究了在超导体的关键电流测量中错误解释的新来源。临界电流是导体在恢复为正常电阻状态时在淬火之前可以承受的最大电流。研究人员可以通过测量焊接到超导线上的电压抽头对上的电阻电压来确定何时达到临界电流。但是，NIST的科学家发现，在电压抽头形成的环路中会感应出异常的感应电压。感应电压会随着电流，电流扫描方向（增大或减小），施加的磁场以及在紧接之前的测量中是否将样品驱动到正常状态而系统地变化。此外，在结束电流斜坡之后，感应电压信号的衰减时间在电阻转变的开始附近更长。在超导体失超后的第一次电流扫描期间，这些衰减时间甚至更长。

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