VUV-Photoemission Study of (La_<1-x>Sr_x)_2CuO_<4-δ> Single Crystals and Their Surface Degradation

概要

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We have measured the valence-band photoelectron spectra of (La<1-x>Sr_x)_2CuO_<4-δ> single crystals. Spectra obtained at low temperatures (30-80 K) are similar to each other as well as the results reported so far : The intensity at the Fermi level is quite low and the valence-band maximum is shifted to higher binding-energy than what the energy-band calculation predicts. At room temperature the intensity of the 3 eV band is reduced rapidly while the specimen is kept in dark, while it shows a quick recovery when the specimen is exposed to the excitation light for photoelectron measurements. This suggests that a photo-assisted process may take part in this phenomenon. Some possible mechanisms for the photo-induced changes are discussed.
社団法人日本物理学会の論文
1993-10-15