Figure 3
Sections of unpolarized IR absorption spectra measured at T ≤ 10 K under a uniaxial stress of 227 MPa, \({p}\parallel \mathrm{[100]}\). The spectra labeled 10 K were measured immediately after applying the stress at T ≤ 10 K. Those labeled 197 and 182 K were obtained after annealing under the stress at the corresponding temperatures.
