Optical mode crossing is not a plausible explanation for the new broad Brillouin doublet nor for the strong acoustic anomalies observed at low temperatures in SrTiO3. Data presented to support that explanation are also inconclusive.
Isabella Di Lenardo, Lucas Arnaud André Rappo, Rémi Guillaume Petitpierre, Marion Kramer
Michael Lehning, Dylan Stewart Reynolds, Michael Haugeneder
Athanasios Nenes, Paraskevi Georgakaki