Valence-band states in Bi sub 2 (Ca,Sr,La) sub 3 Cu sub 2 O sub 8

Journal Article · Fri Sep 01 00:00:00 EDT 1989 · Physical Review (Section) B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.40.5259· OSTI ID:5575079

Wells, B O; Lindberg, P A.P.; Shen, Z; Dessau, D S; Spicer, W E; Lindau, I ^[1]; Mitzi, D B; Kapitulnik, A ^[2]

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1. Stanford Electronics Laboratories, Stanford University, Stanford, California 94305 (US)
2. Department of Applied Physics, Stanford University, Stanford, California 94305

We have used photoemission spectroscopy to examine the symmetry of the occupied states of the valence band for the La-doped superconductor Bi{sub 2}(Ca,Sr,La){sub 3}Cu{sub 2}O{sub 8}. While the oxygen states near the bottom of the 7-eV wide valence band exhibit predominantly O 2{ital p}{sub {ital z}} symmetry, the states at the top of the valence band extending to the Fermi level are found to have primarily O 2{ital p}{sub {ital x}} and O 2{ital p}{sub {ital y}} character. We have also examined anomalous intensity enhancements in the valence-band features for photon energies near 18 eV. These enhancements, which occur at photon energies ranging from 15.8 to 18.0 eV for the different valence-band features, are not consistent with either simple final-state effects or direct O 2{ital s} transitions to unoccupied O 2{ital p} states.

• OSTI ID: 5575079
• Journal Information: Physical Review (Section) B: Condensed Matter; (USA), Journal Name: Physical Review (Section) B: Condensed Matter; (USA) Vol. 40:7; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

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STRONTIUM OXIDES
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