Strain: a strctural or electronical instability?
Elasto-resistivity→Nematic susceptibility
Elastic stiffness→Shear modulus
弹性电阻测量和弹性刚度测量
为确定向列序是一级结构相变还是电学特征主导的相变,可以使用这些测量方式。GL的自由能如下,对应electronic向列序参量,
对应sructural弹性应变。

用这个类似于居里温度律的公式,能够用反映T=T*的激起反映属于electronic的。


https://www.science.org/doi/full/10.1126/science.1221713
Divergent Nematic Susceptibility in an Iron Arsenide Superconductor
以上

以下
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.047001
Nematic Susceptibility of Hole-Doped and Electron-Doped BaFe2As2 Iron-Based Superconductors from Shear Modulus Measurements
