Thermally modulated infrared-reflectivity spectra in BaBiO3 are measured. The observation of an infrared-active vibrational mode at 500 cm-1 and an associated electronic excitation at 1.4 eV is consistent with the conjecture of self-localized polarons. However, the estimated polaron mass is anomalously small, suggesting that oscillator strength has transferred from the optical phonons to the infrared-active vibrational mode.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics