Symmetric and antisymmetric strain as continuous tuning parameters for electronic nematic order

Abstract

We report the separate response of the critical temperature of the nematic phase transition $T_{\mathrm{S}}$ to symmetric and antisymmetric strains for the prototypical underdoped iron pnictide Ba(Fe${}_{0.975}$Co${}_{0.025}$)${}_2$As${}_2$. This decomposition is achieved by comparing the response of $T_{\mathrm{S}}$ to uniaxial stress and hydrostatic pressure. In addition to quantifying the two distinct linear responses to symmetric strains, we find a quadratic variation of $T_{\mathrm{S}}$ as a response to antisymmetric strains ${\epsilon }_{{\mathrm{B}}_{1g}}$=$\frac{1}{2}$(${\epsilon }_{\mathrm{xx}}$-${\epsilon }_{\mathrm{yy}}$), exceeding the non linear response to symmetric strains by at least two orders of magnitude. These observations establish orthogonal antisymmetric strain as a powerful tuning parameter for nematic order.

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• AC Elastocaloric effect as a probe for thermodynamic signatures of continuous phase transitions
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• The relationship between transport anisotropy and nematicity in FeSe
• Elastocaloric signature of nematic fluctuations
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• The transport-structural correspondence across the nematic phase transition probed by elasto-x-ray diffraction
• Evidence for realignment of the charge density wave state in ErTe${}_3$ and TmTe${}_3$ under uniaxial stress via elastocaloric and elastoresistivity measurements
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• Measurement of Elastoresistivity at Finite Frequency by Amplitude Demodulation
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• Elastoresistive and Elastocaloric Anomalies at Magnetic and Electronic-Nematic Critical Points
• Symmetry-breaking pathway towards the unpinned broken helix
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• Frequency-dependent sensitivity of AC elastocaloric effect measurements explored through analytical and numerical models
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• Strain tuning and anisotropic spin correlations in iron-based systems
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• Probing multipolar order in the candidate altermagnet MnF${}_2$ through the elastocaloric effect under strain
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