Fig. 4: Peak centers for both phonon modes as a function of temperature.
From: Magnetic properties of intercalated quasi-2D Fe3-xGeTe2 van der Waals magnet
The temperature evolution of these modes for pristine (closed symbols, a, b) and intercalated (open symbols, c, d) FGT is modeled using a Boltzmann sigmoidal model (dashed line). The deviation between this simulated unperturbed mode and the experimental data is readily apparent.
