Measurement of Elastoresistivity at Finite Frequency by Amplitude Demodulation

Abstract

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.

arXiv comment15 pages, 13 figures

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Cited by in corpus (11)

• AC Elastocaloric effect as a probe for thermodynamic signatures of continuous phase transitions
• Nematic quantum criticality in an Fe-based superconductor revealed by strain-tuning
• Elastocaloric signature of nematic fluctuations
• Hydrostatic and uniaxial pressure tuning of iron-based superconductors: Insights into superconductivity, magnetism, nematicity and collapsed tetragonal transitions
• Evidence for realignment of the charge density wave state in ErTe${}_3$ and TmTe${}_3$ under uniaxial stress via elastocaloric and elastoresistivity measurements
• Emergent Tetragonality in a Fundamentally Orthorhombic Material
• Elastoresistive and Elastocaloric Anomalies at Magnetic and Electronic-Nematic Critical Points
• Comparison of temperature and doping dependence of nematic susceptibility near a putative nematic quantum critical point
• Growth of nematic susceptibility in the field-induced normal state of an iron-based superconductor revealed by elastoresistivity measurements in a 65 T pulsed magnet
• Frequency-dependent sensitivity of AC elastocaloric effect measurements explored through analytical and numerical models
• Measurements of nematic susceptibility with phase sensitive nuclear magnetic resonance in pulsed strain fields