Design of low temperature measurement experimental device based on superconductor magnetic penetration depth

doi:10.7523/j.ucas.2023.020

Abstract

Abstract: The magnetic penetration depth of the external magnetic field into the superconductor varies with the temperature of the superconductor, especially near the superconducting transition temperature, the penetration depth changes dramatically. Detecting the change of the penetration depth can achieve high-resolution measurement of temperature changes, which is an important principle of deep and low temperature measurement. Based on this basic principle, this work studies a temperature measurement scheme using the change of superconductor penetration depth, the quantization of closed superconducting loop magnetic flux and the superconducting quantum interference device (SQUID), carries out theoretical analysis and simulation, which is expected to achieve a temperature resolution of nK/Hz in the liquid helium temperature region, and gives the specific experimental device design. This method has high resolution, does not introduce additional heat flow, and does not require continuous current excitation. It can greatly reduce the adverse effects of the traditional temperature measurement caused by thermometer self-heating effect and contact thermal resistance, etc. by plating superconducting film on the surface of the object, which is beneficial to the temperature measurement experiments and applications below 10K.

Key words: Magnetic penetration depth, Superconducting quantum interference device, Low temperature measurement

CLC Number:

TK124

ZHU Changyang, BIAN Xing, WANG Jinzhen, LIU Jie. Design of low temperature measurement experimental device based on superconductor magnetic penetration depth[J]. Journal of University of Chinese Academy of Sciences, DOI: 10.7523/j.ucas.2023.020.

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