快速测量单晶样品低温热电势的新方法  

A FAST METHOD FOR THERMOPOWER MEASUREMENTS ON SINGLE CRYSTAL SAMPLES

作　　者：刘剑[1] 瞿昊[1] 柴一晟[1] 杨宏顺[1] 曹烈兆[1] 

机构地区：[1]中国科学技术大学物理系,结构分析开放实验室合肥230026

出　　处：《低温物理学报》2006年第1期78-81,共4页Low Temperature Physical Letters

基　　金：国家自然科学基金(批准号:10374082)~~

摘　　要：对传统的热电势倒相测量方法进行了改进,发展了一种快速的、针对毫米级样品的准连续的热电势测量方法,在不降低测量精度的情况下大幅度提高了热电势的测量速度.我们用高温超导材料Nd1.84Ce0.16CuO4单晶样品对该法进行了不同变温速率的测试,并与传统的倒相法进行比较,一定变温速率(<30K/hr)下和传统方法数据吻合很好,有很高的测量精度.由于此法为准连续测量法,变温速率可精确设定,所以对有明显热滞效应的材料如电子型超导体母体材料Nd2CuO4等的热电势测量有十分重要的意义.A fast, quasi-continuous method for thermopower measurements on mm-size single crystal samples is developed. The measurement time is greatly reduced without much loss of precision. The new method is demonstrated on high-Tc superconductor Nd1.84Ce0.16CuO4 single crystal samples with various temperaturechanging rates. Below a critical temperature-changing rate （ 〈 30K/hr）, the results coincide with those derived from traditional method very well. The new method is quasi - continuous and the measurement time can be determined accurately, so it is especially suitable for materials with thermal hysteresis, such as Nd2 CuO4.

关 键 词：热电势 测量方法 

分 类 号：O511.2[理学—低温物理]