Elastocaloric signature of nematic fluctuations

Abstract

The elastocaloric effect (ECE) is a thermodynamic quantity relating changes in entropy to changes in strain experienced by a material. As such, ECE measurements can provide valuable information about the entropy landscape proximate to strain-tuned phase transitions. For ordered states that break only point symmetries, bilinear coupling of the order parameter with strain implies that the ECE can also provide a window on fluctuations above the critical temperature, and hence, in principle, can also provide a thermodynamic measure of the associated susceptibility. To demonstrate this, we use the ECE to sensitively reveal the presence of nematic fluctuations in the archetypal Fe-based superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$. By performing these measurements simultaneously with elastoresistivity in a multimodal fashion, we are able to make a direct and unambiguous comparison of these closely related thermodynamic and transport properties, both of which are sensitive to nematic fluctuations. As a result, we have uncovered an unanticipated doping-dependence of the nemato-elastic coupling and of the magnitude of the scattering of low energy quasi-particles by nematic fluctuations -- while the former weakens, the latter increases dramatically with increasing doping.

References in corpus (22)

• Divergent nematic susceptibility in an iron arsenide superconductor
• Elastocaloric effect associated with the martensitic transition in shape-memory alloys
• Determination of the phase diagram of the electron doped superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Effects of nematic fluctuations on the elastic properties of iron arsenide superconductors
• Ubiquitous signatures of nematic quantum criticality in optimally doped Fe-based superconductors
• Enhancement of superconductivity near a nematic quantum critical point
• Superconductivity and non-Fermi liquid behavior near a nematic quantum critical point
• Piezoelectric-based apparatus for strain tuning
• Observation of incipient charge nematicity in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Nematic susceptibility of hole- and electron-doped BaFe2As2 iron-based superconductors from shear modulus measurements
• Anisotropic in-plane resistivity in the nematic phase of the iron pnictides
• Charge Nematicity and Electronic Raman Scattering in Iron-based Superconductors
• Nematic fluctuations and the magneto-structural phase transition in $\mathrm{Ba}(\mathrm{F}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{C}{\mathrm{o}}_{\mathrm{x}}{)}_2\mathrm{A}{\mathrm{s}}_2$
• Thermal expansion and Grüneisen parameters of Ba(Fe1-xCox)2As2 - a thermodynamic quest for quantum criticality
• Symmetric and antisymmetric strain as continuous tuning parameters for electronic nematic order
• 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
• Pairing instability near a lattice-influenced nematic quantum critical point
• Elastocaloric signature of nematic fluctuations
• Critical divergence of the symmetric ($A_{1g}$) nonlinear elastoresistance near the nematic transition in an iron-based superconductor
• Measurement of Elastoresistivity at Finite Frequency by Amplitude Demodulation
• Frequency-dependent sensitivity of AC elastocaloric effect measurements explored through analytical and numerical models

Cited by in corpus (8)

• Elastocaloric determination of the phase diagram of Sr${}_2$RuO${}_4$
• Elastocaloric signature of nematic fluctuations
• The transport-structural correspondence across the nematic phase transition probed by elasto-x-ray diffraction
• Elastocaloric signatures of symmetric and antisymmetric strain-tuning of quadrupolar and magnetic phases in DyB2C2
• Role of Local Ru Hexamers in Superconductivity of Ruthenium Phosphide
• Comparison of temperature and doping dependence of nematic susceptibility near a putative nematic quantum critical point
• Elasto-Raman scattering: arsenic optical phonon as a probe of nematicity in BaFe${}_2$As${}_2$
• Nematic fluctuations mediated superconductivity revealed by anisotropic strain in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$