用于高Tc超导体光电特性研究简易测量系统

根据减压降温原理，自行设计制作了带光学窗口的ＬＮ２低温恒温器，其工作温区为６３．５—３００Ｋ．在自然升温状态中，低温区的温升速率约０．０２Ｋ／ｍｉｎ．根据几何光学原理，用较简易的光路实现了激光束的二维平面移动，其移动精度为０．０１ｍｍ．采用ＩＥＥＥ－４８８通用接口总线，实现了计算机控制下的数据采样．整个系统的采样速率可达６００次／ｍｉｎ，数据经处理后即可得到测量曲线．我们用该系统测量了高Ｔｃ超导样品的Ｒ～Ｔ关系曲线以及不同温度下ＹＢＣＯ薄膜的光响应随电流的变化曲线．结果表明，该系统能够运用于实际测量工作．

A Simple Measuring System for Photoresponse of HTS

A simple cryostat is designed and made to measure photoresponse of hightemperature superconductors. Its cool finger can work in a range of temperaturefrom 63. 5 K to 300 K and the rate of temperature rising, from 63. 5 K to 79 K, isabout 0. 02 K/min without temperature control. A two dimension optical systemis carried out, which is able to focus the laser beam on samples without any difficulty. By using GPIB interface, a computer-controlled data logging is realized.We present the temperature dependence of resistance of YBCO and the time dependence of the temperature of the cryostat, which are performed by the datamanagement system.