Critical divergence of the symmetric ($A_{1g}$) nonlinear elastoresistance near the nematic transition in an iron-based superconductor

We report the observation of a nonlinear elastoresistivity response for the prototypical underdoped iron pnictide Ba(Fe $_{0.975}$ Co $_{0.025}$ ) $_{2}$ As $_{2}$ . Our measurements reveal a large quadratic term in the isotropic ( $A_{1 g}$ ) electronic response that was produced by a purely shear ( $B_{2 g}$ ) strain. The divergence of this quantity upon cooling towards the structural phase transition reflects the temperature dependence of the nematic susceptibility. This observation shows that nematic fluctuations play a significant role in determining even the isotropic properties of this family of compounds.

Critical divergence of the symmetric ( $A_{1 g}$ ) nonlinear elastoresistance near the nematic transition in an iron-based superconductor

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Critical divergence of the symmetric ( $A_{1 g}$ ) nonlinear elastoresistance near the nematic transition in an iron-based superconductor

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Critical divergence of the symmetric (A1gA1g​) nonlinear elastoresistance near the nematic transition in an iron-based superconductor

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Critical divergence of the symmetric (A1gA1g​) nonlinear elastoresistance near the nematic transition in an iron-based superconductor

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Critical divergence of the symmetric ( $A_{1 g}$ ) nonlinear elastoresistance near the nematic transition in an iron-based superconductor

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AI智能校验

Critical divergence of the symmetric ( $A_{1 g}$ ) nonlinear elastoresistance near the nematic transition in an iron-based superconductor

讲解博客

AI智能校验