Resonant inverse photoemission of Bi/sub 2/Ca/sub 1+//sub x/Sr/sub 2-//sub x/Cu/sub 2/O/sub 8+//sub y/ and YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/, unoccupied oxygen states, and plasmons

Journal Article · Wed Feb 01 04:00:00 EST 1989 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.39.2928· OSTI ID:6441660

Wagener, T J; Hu, Y; Gao, Y; Jost, M B; Weaver, J H; Spencer, N D; Goretta, K C

Inverse photoemission studies of the unoccupied states of Bi/sub 2/Ca/sub 1+//sub x/Sr/sub 2-//sub x/Cu/sub 2/O/sub 8+//sub y/ and YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/, with and without 10% Pb substitution for Bi, show a low density of states within 2 eV of the Fermi level and broad structures at 4, 9.6, and 12.6 eV that are associated with Bi 6p, Ca 3d, and Sr 4d empty state bands. Plasmon losses are observed via their radiative decay at photon energies of 15 and 21.2 eV. Resonant inverse photoemission, using incident electron energies that excite O 2s shallow core levels, enhances emission from the unoccupied O 2p levels. Resonance results for YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ and Bi/sub 2/Ca/sub 1+//sub x/Sr/sub 2-//sub x/Cu/sub 2/RO/sub 8+//sub y/ show similar oxygen distributions near E/sub F/.

• Research Organization: Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
• OSTI ID: 6441660
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:4; ISSN PRBMD
• Country of Publication: United States
• Language: English

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