Nematic Susceptibility of the Iron-Based Superconductors Probed by Elastoresistance Measurements

Abstract

 Suguru HOSOI 1,  芝内 孝禎  Takasada SHIBAUCHI 2 In the iron-based superconductors, elastoresistance has successfully explored the anisotropic electronic instabili-ty associated with nematic order, recognized as nematic susceptibility. This article reviews the techniques of elastoresistance measurements using the piezoelectric actuators and the behaviors of nematic susceptibility in various iron-based superconductors, including FeSe 1 － x S x , hole-doped BaFe 2 As 2 system, and the iron-ladder materials BaFe 2 S 3 . In addition, we report non-linear strain dependence of resistivity anisotropy inside the nematic revealed by applying the large strain using the platform techniques. ［ elastoresistance, nematic