Photoinduced-reflection spectroscopy of insulating La2CuO4 single crystals
Bazhenov A. V., Gorbunov A. V., Timofeev V. B.
Photoinduced optical transitions in La2Cu04 single crystals can be detected by a method based on a differential reflection of light. Light-induced electronic transitions have been observed in the spectral interval 0.1-0.6 eV. At a high excitation level, the intensity ratio of the low-energy transitions and the 0.55-eV transition is a stronger than linear function of the intensity of the exciting light. Photoinduced transitions are discussed on the basis of a model of spin-polaron complexes.