金刚石对顶压砧中超导转变温度的磁测量系统设计  

Design of susceptibility measurement system of superconducting transition temperature in diamond anvil cell

作　　者：周俊生[1] 黄敏兴[1] 

机构地区：[1]华南理工大学物理系,广州510641

出　　处：《电子测量技术》2014年第6期93-96,共4页Electronic Measurement Technology

摘　　要：金刚石对顶压砧(DAC)中,用电阻法、比热法等来实现超导转变温度测量时,由于高压状态下,直接安装在样品上的电极极易受压断裂且制作困难,成功率极低,不易实现。测量系统设计的自感交流磁化率方案可解决上述问题,测量系统分为磁信号检测、温度检测以及基于LabVIEW的数据采集处理3部分组成。通过对样品发生超导前后的模拟测试,测量出超导样品发生超导的转变温度。这表明所设计的超导转变磁测量系统,可用于高压实验室的超导转变检测。In the test about diamond anvil cell （DAC）, it＇s difficult to measure the superconducting transition temperature by electrical resistance method and specific heat method, because the electrode set on the sample directly is easy to break in high pressure case. This problem can be solved by the measurement system designed on the basis of self inductance AC susceptibility scheme. This system is made up of three parts： magnetic detection, temperature detection and data processing based on LabVIEW. Measure the superconducting transition temperature of the sample by the corresponding experiment. The result proves this system can be used for measuring supercondueting transition in high pressure lab.

关 键 词：金刚石对顶压砧(DAC) 迈斯纳效应 交流磁化率 锁相放大技术 

分 类 号：TN06[电子电信—物理电子学] TP391.9[自动化与计算机技术—计算机应用技术]