Measurement of the elastoresistivity coefficients of the underdoped iron-arsenide Ba(Fe${}_{0.975}$Co${}_{0.025}$)${}_2$As${}_2$

Abstract

A new method is presented for measuring terms in the elastoresistivity tensor $m_{ij}$ of single crystal samples with tetragonal symmetry. The technique is applied to a representative underdoped Fe-arsenide, Ba(Fe${}_{0.975}$Co${}_{0.025}$)${}_2$As${}_2$, revealing an anomalously large and anisotropic elastoresistance in comparison to simple metals. The $m_{66}$ coefficient follows a Curie-Weiss temperature dependence, providing direct evidence that the tetragonal-to-orthorhombic structural phase transition that occurs at $T_s$ = 97.5 K in this material is not the result of a true-proper ferro-elastic transition. Rather, the material suffers a pseudo-proper transition for which the lattice strain is not the primary order parameter.

References in corpus (13)

• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Evidence for an electron nematic phase transition in underdoped iron pnictide superconductors
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• Low-temperature, in situ tunable, uniaxial stress measurements in semiconductors using a piezoelectric actuator
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