YBa sub 2 Cu sub 3 O sub 7 minus x (001) studied at 60 K with momentum-resolved inverse photoemission

Journal Article · Sun Jul 01 00:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.1041· OSTI ID:6564708

Wagener, T J; Hu, Y; Jost, M B; Weaver, J H ^[1]

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1. Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455 (USA)

Momentum-resolved inverse photoelectron spectroscopy has been used to study the unoccupied electronic states of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} (001) at 60 K. We find low emission between {ital E}{sub {ital F}} and {ital E}{sub {ital F}}+2 eV that is attributed to empty Cu 3{ital d}--O 2{ital p} hybrids and structure at {similar to}7, 9, and 14 eV above {ital E}{sub {ital F}} that results from the Ba 5{ital d}, Y 4{ital d}, and Ba 4{ital f} levels, respectively. An O 2{ital p} hole-derived feature centered at {ital E}{sub {ital F}}+1 eV is observed to resonate when the incident electron energy is {similar to}18 eV. Normal incidence studies show nondispersive empty-state features at {ital E}{sub {ital F}}+0.5, 1, 1.8, and 3 eV. Angle-dependent studies that probe along {Gamma}-{ital Y} show dispersion with two bands derived from the Cu-O chains reaching a maximum at {ital Y} ({ital E}{sub {ital F}}+0.4 and 1.5 eV). These off-normal results are consistent with angle-resolved photoemission studies of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} (001) and are discussed within the context of band-structure calculations.

• OSTI ID: 6564708
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 42:1; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
ELECTRONIC STRUCTURE
COPPER OXIDES
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BAND THEORY
HIGH-TC SUPERCONDUCTORS
PHOTON EMISSION
VERY LOW TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
EMISSION
OXIDES
OXYGEN COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
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