【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.更多还原

【Abstract】 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-T c superconductor Nd 1.84 Ce 0.16 CuO 4 single crystal samples with various temperature-changing 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 Nd 2 CuO₄ .更多还原