Transformation temperature measuring method for high temperature superconducting material based on two-point Delta method

Abstract

The invention discloses a transformation temperature measuring method for high temperature superconducting material based on a two-point Delta method, which comprises the following steps: the to-be-measured high temperature superconducting material is placed in a closed vacuum chamber, the high temperature superconducting material is refrigerated through refrigerating equipment, and current is exerted on the to-be-measured high temperature superconducting material through a constant-current source, wherein the exerted current is commutation current realized and controlled by an upper computer; meanwhile, voltage data of the to-be-measured high temperature superconducting material is emitted to the upper computer through a voltage measuring instrument; the temperature of the to-be-measured high temperature superconducting material measured by a temperature sensor is received, displayed and emitted to the upper computer through a temperature measuring and controlling instrument; the temperature data and the voltage data received by the upper computer are processed through the two-point Delta method and stored so as to form a change curve of the electric resistance of the to-be-measured high temperature superconducting material along with the temperature; as a result, the transformation temperature of the to-be-measured high temperature superconducting material can be determined. The method provided by the invention realizes accurate measurement of the transformation temperature of the high temperature superconducting material, and guarantees the high reliability and the automation of highly accurate measurement of the transformation temperature of the high temperature superconducting material.

Description

technical field [0001] The invention relates to the field of superconducting electronics, specifically, a method for measuring the transition temperature of a high-temperature superconducting material based on the two-point Delta method, which realizes high-precision measurement of the transition temperature of the high-temperature superconducting material. Background technique [0002] The preparation technology of high-temperature superconducting materials has been relatively mature at present, and the indicators for judging their performance include transition temperature Tc, critical current characteristic Jc, and superconducting surface microwave resistance Rc, etc. The superconducting transition temperature Tc is a measure of the high-temperature superconducting film sample. One of the main indicators of performance, having a high superconducting transition temperature is a prerequisite for the large-scale application of superconducting materials and superconducting tec...

AI Technical Summary

Problems solved by technology

The previous method for measuring superconducting samples is the four-wire method of passing a constant current through the sample to be tested, but applying a single-directional current to the sample for a long time will cause a thermoelectric potential to be generated at both ends of the superconducting material to be tested, and the magnitude of the thermoelectric potential is between It can be ignored when measuring large resistance (such as >1Ω), but for measuring the transition temperature of high-temperature superconducting samples, since the resistance in the superconducting state is "zero", the interference of such thermoelectric potential cannot be ignored

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