引言目前,对低温物性和超导的研究都是以液氦为冷源。最近,我们用相当于常规办法的1/10—1/20的经费,建立了液氦温度下的小样品测试条件。在仪器调整后近20天时间内,利用微致冷机,根据美国贝尔实验室Schawlow和Devlin的“超导体在穿透深度方面的能隙效应”用频率法复现了锡的超导转变温度T_c=3.74K。 Introduction At present, the research on the properties of cryogenic materials and superconductivity all take the liquid helium as the cold source. Recently, we have used the equivalent of 1 / 10-1 / 20 of the conventional method to establish the test conditions for small samples at liquid helium temperature. Nearly 20 days after the instrument was adjusted, the microchamber was used to reproduce the superconducting transition temperature Tc of tin by the frequency method according to the “energy gap effect of the superconductors in terms of penetration depth” by Schawlow and Devlin of Bell Labs of the United States = 3.74K.