We observed an instantaneous reflectance change triggered by pulse laser irradiation. The laser heating cannot account for the action spectra, which are indicative of the charge-gap collapse. It is found in Ph1-xCaxMnO3 for a wide range of Ca doping, x=0, 0.1, 0.2, 0.31, 0.4, and 0.5, which suggests that the photoinduced charge gap collapse is not characteristic of charge-ordered insulators. We propose that the photoinduced charge gap collapse can be a general behavior in strongly correlated insulators.
|Number of pages||4|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Dec 1 2000|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics