Device and method for measuring superconducting transition temperature of high temperature superconducting material

Abstract

The invention discloses a device and a method for measuring the superconducting transition temperature of a high temperature superconducting material, and belongs to the field of superconducting electronics. The method comprises the following steps that: the high temperature superconducting material to be measured is put into a closed vacuum chamber and is refrigerated by a compression refrigerating machine; a constant current source applies current to the high temperature superconducting material to be measured; a voltage measuring instrument sends the voltage data of the high temperature superconducting material to be measured to an acquisition and processing system; a temperature measuring instrument receives and displays the temperature of the high temperature superconducting materialto be measured, which is measured by a temperature sensor, and sends the temperature to the acquisition and processing system; and the acquisition and processing system stores the temperature data and the voltage data of the high temperature superconducting material to be measured, which are sent by the temperature measuring instrument and the voltage measuring instrument, and generates the change curve of the resistance of the high temperature superconducting material to be measured along with the temperature, so that the superconducting transition temperature of the high temperature superconducting material to be measured is determined. By the device and the method, the superconducting transition temperature of the high temperature superconducting material to be measured can be accurately measured, and certain practical value for the performance inspection of the prepared high temperature superconducting material is achieved.

Description

technical field [0001] The invention relates to the field of superconducting electronics, in particular to a measuring device and a measuring method for measuring the superconducting transition temperature of high-temperature superconducting materials. 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 technology. [0003] At present, there are two main methods for measuring the superconducting transition temp...

AI Technical Summary

Problems solved by technology

The previous method of measuring superconducting samples was to use liquid nitrogen or liquid helium to provide a low-temperature environment, and then use the method of moving the sample holder to change the position of the sample holder and the sample of the high-temperature superconducting material to be measured on it to obtain different temperature zones. The whole process The sample holder needs to be moved continuously. Due to the uncertainty of human movement, the range of the sample rod measurement rack is too large during a certain movement process, which causes the temperature of the high-temperature superconducting sample on it to change too fast or too slow. This puts higher strict requirements on the acquisition and processing system, and more points need to be collected in a certain process.

Especially when liquid helium is used for measurement, the cost is relatively expensive, so a low-temperature measurement system based on a refrigerator that provides a relatively uniform temperature change and can continuously change from room temperature can well meet this requirement

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