Frequency-dependent sensitivity of AC elastocaloric effect measurements explored through analytical and numerical models

TL;DR

This paper investigates how the sensitivity of AC elastocaloric effect measurements varies with frequency using analytical and numerical models, providing insights and guidelines for experimental applications.

Contribution

It introduces a comprehensive analytical and numerical framework to understand the frequency-dependent sensitivity in AC elastocaloric measurements, with practical guidelines for experiments.

Findings

Models accurately reproduce thermal transfer functions observed in experiments.

Provides practical guidelines for experimentalists using AC elastocaloric techniques.

Establishes a baseline for comparing frequency responses in elastocaloric measurements.

Abstract

We present a comprehensive study of the frequency-dependent sensitivity for measurements of the AC elastocaloric effect by applying both exactly soluble models and numerical methods to the oscillating heat flow problem. These models reproduce the finer details of the thermal transfer functions observed in experiments, considering here representative data for single-crystal Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$. Based on our results, we propose a set of practical guidelines for experimentalists using this technique. This work establishes a baseline against which the frequency response of the AC elastocaloric technique can be compared and provides intuitive explanations of the detailed structure observed in experiments.