Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Photoemission study of a high-T/sub c/ superconducting Bi-Sr-Ca-Cu oxide

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
We have used ultraviolet, x-ray, and inverse-photoemission spectroscopies to characterize the electronic structure of a novel bismuth cuprate compound with an average composition Bi/sub 2.5/Sr/sub 1.5/Ca/sub 1/Cu/sub 2/O/sub y/ which becomes superconductor at 84 K. The data indicate that the valence band is shifted approx.2 eV to higher binding energy with respect to band-structure calculations. This together with the presence of shake-up satellites in the Cu 2p spectrum suggests that U/sub d//sub d/ is approx.6 eV for Cu 3d electrons in this Bi compound. The electron-electron correlation seems to be much smaller in the Bi-O planes than in the Cu-O planes. The chemical state of the cations is basically Cu/sup 2+/, Bi/sup 3+/, Ca/sup 2+/, and Sr/sup 2+/.
Research Organization:
Departamento de Fisica de la Materia Condensada, Universidad Autonoma de Madrid, E-28049 Madrid, Spain
OSTI ID:
6933511
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:7; ISSN PRBMD
Country of Publication:
United States
Language:
English