振幅解调法测量有限频率下的弹性电阻率
Measurement of Elastoresistivity at Finite Frequency by Amplitude Demodulation
摘要：
弹性电阻率，电阻率和应变之间的关系，可以阐明材料的电子结构的微妙性质，是研究强相关材料的一个越来越重要的工具。迄今为止，弹性电阻率测量主要是用准静态（DC）应变进行的。在这项工作中，我们演示了一种方法，使用AC应变的弹性电阻率测量。经历AC应变的样品具有随时间变化的电阻率，其调制由AC电流产生的电压;这种效应产生与弹性电阻率成正比的电阻率随时间变化，并且可以更快地测量，样品上的应变更小，并且对温度稳定性的要求比以前的DC技术更低。在10 Hz和3 kHz之间的示例测量在具有大的、良好表征的和温度依赖的弹性电阻率的材料上进行：代表性的铁基超导体BaFe $_{1.975}$ Co $_{0.025}$ As $_2$。这些测量产生一个频率无关的弹性电阻率和重现从以前的直流弹性电阻率方法的结果，在实验精度。我们强调，动态（AC）弹性电阻率是一个独特的材料特定的属性，以前没有被考虑。
英文摘要：
Elastoresistivity, the relation between resistivity and strain, can elucidate subtle properties of the electronic structure of a material and is an increasingly important tool for the study of strongly correlated materials. To date, elastoresistivity measurements have been predominantly performed with quasi-static (DC) strain. In this work, we demonstrate a method for using AC strain in elastoresistivity measurements. A sample experiencing AC strain has a time-dependent resistivity, which modulates the voltage produced by an AC current; this effect produces time-dependent variations in resisitivity that are directly proportional to the elastoresistivity, and which can be measured more quickly, with less strain on the sample, and with less stringent requirements for temperature stability than the previous DC technique. Example measurements between 10 Hz and 3 kHz are performed on a material with a large, well-characterized and temperature dependent elastoresistivity: the representative iron-based superconductor BaFe$_{1.975}$Co$_{0.025}$As$_2$. These measurements yield a frequency independent elastoresistivity and reproduce results from previous DC elastoresistivity methods to within experimental accuracy. We emphasize that the dynamic (AC) elastoresistivity is a distinct material-specific property that has not previously been considered.
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