弾性抵抗測定から探る鉄系超伝導体におけるネマティック感受率

抄録

In the iron-based superconductors, elastoresistance has successfully explored the anisotropic electronic instability 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－xS_x, hole-doped BaFe₂As₂ system, and the iron-ladder materials BaFe₂S₃. In addition, we report non-linear strain dependence of resistivity anisotropy inside the nematic phase revealed by applying the large strain using the platform techniques.