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Electron-energy-loss spectra of the high-T/sub c/ superconductors Y-Ba-Cu-O and La-Sr-Cu-O

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
Electronic excitations of Y-Ba-Cu-O in superconducting and nonsuperconducting form and of La-Sr-Cu-O have been investigated by electron-energy-loss spectroscopy (EELS) in the valence and shallow core region, both in dN/dE and N(E) form. The importance of quasiatomic resonances in the loss region 15 eVless than or equal to..delta..Eless than or equal to50 eV are emphasized, while the differences observed between superconducting and nonsuperconducting Y-Ba-Cu-O are ascribed to differences in the Cu-O stoichiometry. The temperature-induced decomposition of Y-Ba-Cu-O leads to a BaO-type surface layer; EELS from this layer corroborates the present loss assignments. The influence of electron-beam irradiation on La-Sr-Cu-O is discussed.
Research Organization:
Institut fuer Physikalische Chemie, Universitaet Innsbruck, A-6020 Innsbruck, Austria
OSTI ID:
6552062
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Journal Issue: 1 Vol. 39:1; ISSN PRBMD
Country of Publication:
United States
Language:
English