J. Phys. Colloques
Volume 48, Numéro C9, Décembre 1987X-Ray and Inner-Shell Processes
|Page(s)||C9-1185 - C9-1188|
J. Phys. Colloques 48 (1987) C9-1185-C9-1188
Cu-L X-RAY EMISSION SPECTRA FROM HIGH-Tc SUPERCONDUCTORS Y-Ba-CU-O BELOW AND ABOVE THE CRITICAL TEMPERATURER.C.C. PERERA, B.L. HENKE, P.J. BATSON, J.A. KERNER and D. BERKELAND
Center for X-Ray Optics, Lawrence Berkeley Laboratory, Berkeley, CA 94720, U.S.A. and Carl Nordling, Institute of Physics, University of Uppsala, PO Box 530, S-751 21 Uppsala, Sweden
The copper Lα and Lβ x-ray emission spectra from high-Tc Y-Ba-Cu-O superconductors, above and below the critical temperature, have been measured in a laboratory x-ray spectrograph. The Zn-Lα (1011 eV) photon energy was used to produce the Cu-2p1/2,3/2 primary vacancies (binding energies ~950 and 930 eVs, respectively). Changes in Cu-L x-ray emission spectra were observed indicating small changes in population of 3d and 4s electrons in the valence band when superconducting. For comparison Cu-L emission spectra £rom metallic Cu and £rom polycrystalline Cu2O (valence I) and Cu0 (valence II) were recorded at room temperature.