Comparison of the empty electronic states of Bi sub 2 Sr sub 2 CaCu sub 2 O sub 8 (001) and Bi sub 2 Sr sub 2 CuO sub 6 (001) at 60 and 300 K

Journal Article · Mon Oct 01 04:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.6317· OSTI ID:6014475

Wagener, T J; Hu, Y; Jost, M B; Weaver, J H ^[1]; Yan, Y F; Chu, X; Zhao, Z X ^[2]

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1. Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN (USA)
2. Institute of Physics, P.O. Box 603, Chinese Academy of Science, Beijing (China)

Inverse photoelectron spectroscopy has been used to study the unoccupied electronic states of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} (001) and Bi{sub 2}Sr{sub 2}CuO{sub 6} (001) at 60 and 300 K. Both compounds exhibit low emission between {ital E}{sub {ital F}} and {ital E}{sub {ital F}}+2 eV derived from Cu 3{ital d}--OR 2{ital p} and Bi 6p--O 2{ital p} hybrids and structure centered at {approximately}4 and 9.5 eV that can be attributed to empty Bi 6{ital p} and Sr 4{ital d} levels. Results for Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} show additional structure near {ital E}{sub {ital F}}+10 eV because of contributions from Ca 3{ital d} levels. Plasmons are found for both compounds at 15 and 21.2 eV. Off-normal studies of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} (001) at 60 K showed O 2{ital p} holes with {ital p}{sub {ital x},}{ital y} character. Results obtained at 300 K showed decreased O 2{ital p} hole emission and increased Cu 3{ital d}{sup 10} emission for both Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} and Bi{sub 2}Sr{sub 2}CuO{sub 6} compared with the 60 K results.

• OSTI ID: 6014475
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:10; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

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