VUV-Photoemission Study of (La1-xSrx)2CuO4-δSingle Crystals and Their Surface Degradation

Autor:	Koichi Katsumata, Masayuki Hagiwara, Hideaki Kitazawa, Kazuo Soda, Tamiko Mori, Takehiko Ishii, Makoto Okusawa
Rok vydání:	1993
Předmět:	symbols.namesake Materials science Photoemission spectroscopy Surface preparation Fermi level Analytical chemistry symbols General Physics and Astronomy Degradation (geology) Intensity (heat transfer) Spectral line Excitation Ultraviolet photoelectron spectroscopy
Zdroj:	Journal of the Physical Society of Japan. 62:3590-3597
ISSN:	1347-4073 0031-9015
DOI:	10.1143/jpsj.62.3590
Popis:	We have measured the valence-band photoelectron spectra of (La 1- x Sr x ) 2 CuO 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.
Databáze:	OpenAIRE
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