Fig. 3: Temperature dependence of the soft ferroelectric mode.
From: Doping dependence of the dipolar correlation length scale in metallic SrTiO3
a, b Temperature dependence of ωTO and vTO for the five doping studied compare with the parent compound values from ref. 14 (in black open square points). c Amplitude of the TA softening at Q = (0.05,0.05,2) versus temperature for three dopings compare with the parent compound behavior (in black open circle points from ref. 17). As the TO mode becomes harder the TA softening vanishes as a consequence of the decrease of the coupling between both modes. Error bars are deduced from the convolution with refinement program that finds the best least-squares fit of the dispersion parameters (see Supplementary Information Note B).
