AC Elastocaloric effect as a probe for thermodynamic signatures of continuous phase transitions

Abstract

Studying the response of materials to strain can elucidate subtle properties of electronic structure in strongly correlated materials. So far, mostly the relation between strain and resistivity, the so called elastoresistivity, has been investigated. The elastocaloric effect is a second rank tensor quantity describing the relation between entropy and strain. In contrast to the elastoresistivity, the elastocaloric effect is a thermodynamic quantity. Experimentally, elastocaloric effect measurements are demanding since the thermodynamic conditions during the measurement have to be well controlled. Here we present a technique to measure the elastocaloric effect under quasi adiabatic conditions. The technique is based on oscillating strain, which allows for increasing the frequency of the elastocaloric effect above the thermal relaxation rate of the sample. We apply the technique to Co-doped iron pnictide superconductors and show that the thermodynamic signatures of second order phase transitions in the elastocaloric effect closely follow those observed in calorimetry experiments. In contrast to the heat capacity, the electronic signatures in the elastocaloric effect are measured against a small phononic background even at high temperatures, establishing this technique as a powerful complimentary tool for extracting the entropy landscape proximate to a continuous phase transition.

arXiv comment13 pages, 11 figures

References in corpus (8)

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Cited by in corpus (25)

• Elastocaloric determination of the phase diagram of Sr${}_2$RuO${}_4$
• 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
• Absence of $E_{2g}$ nematic instability and dominant $A_{1g}$ response in the kagome metal CsV${}_3$Sb${}_5$
• Constraints on the superconducting state of Sr${}_2$RuO${}_4$ from elastocaloric measurements
• Elastocaloric signatures of symmetric and antisymmetric strain-tuning of quadrupolar and magnetic phases in DyB2C2
• $T_c$ and the elastocaloric effect of Sr${}_2$RuO${}_4$ under $⟨110⟩$ uniaxial stress: no indications of transition splitting
• Continuously tunable uniaxial strain control of van der Waals heterostructure devices
• Direct measurement of electrocaloric effect based on multi-harmonic lock-in thermography
• Elastocaloric effect in amorphous polymer networks undergoing mechanotropic phase transitions
• Divergent Thermal Expansion and Grüneisen Ratio in a Quadrupolar Kondo Metal
• A temperature-modulated dilatometer by using a piezobender-based device
• Uniaxial stress effect on the electronic structure of quantum materials
• Giant elastocaloric effect at low temperatures in TmVO${}_4$ and implications for cryogenic cooling
• Frequency-dependent sensitivity of AC elastocaloric effect measurements explored through analytical and numerical models
• Magnetic-field-tuned randomness in inhomogeneous altermagnets
• Elastic Quantum Criticality in Nematics and Altermagnets via the Elasto-Caloric Effect
• Realization of giant elastocaloric cooling at cryogenic temperatures in TmVO${}_4$ via a strain load/unload technique
• Quantitative relationship between structural orthorhombicity, shear modulus and heat capacity anomaly of the nematic transition in iron-based superconductors
• Measurements of nematic susceptibility with phase sensitive nuclear magnetic resonance in pulsed strain fields
• Development of microwave surface elastoresistivity measurement technique under tunable strain
• Strain-tunable anomalous Hall effect in hexagonal MnTe
• Probing multipolar order in the candidate altermagnet MnF${}_2$ through the elastocaloric effect under strain