Overdoped (Formula presented) exhibits persistent photoconductivity at low temperatures. This effect has been observed before only in underdoped (Formula presented)=rare earth or yttrium). Contrary to (Formula presented), (Formula presented) shows either a persistent increase or decrease of the carrier density with illumination, depending on doping and wavelength of the incident light. Thus it is possible to increase or decrease the superconducting transition temperature in (Formula presented) reversibly. These photoinduced changes can be explained by the existence of localized states in the charge reservoir layer.
|Original language||English (US)|
|Number of pages||4|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 1997|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics