Positron two-dimensional angular-correlation-of-annihilation-radiation study of untwinned YBa sub 2 Cu sub 3 O sub 6. 9 in the a -axis projection

Journal Article · Tue Sep 01 00:00:00 EDT 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.46.5868· OSTI ID:7177220

Smedskjaer, L C ^[1]; Bansil, A ^[2]; Welp, U; Fang, Y; Bailey, K G ^[1]

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1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
2. Physics Department, Northeastern University, Boston, Massachusetts 02115 (United States)

We present a two-dimensional (2D)-ACAR positron annihilation study of an {ital untwinned} YBa{sub 2}Cu{sub 3}O{sub 6.9} metallic sample in the {ital a}-axis projection; all existing data from untwinned samples have employed the {ital c} projection. The data show a clear presence of the Cu-O chain related ridge Fermi surface extending along the {Gamma}{ital Z} direction and two associated umklapp images at higher momenta. These results are consistent with the previously investigated {ital c} projection of the momentum density in YBa{sub 2}Cu{sub 3}O{sub 6.9} and do not appear to indicate a strong localization of these electron states along the {ital c} direction. We compare and contrast the structures in 2D-ACAR's in the {ital a} and {ital c} projections, delineating similarities and differences between the results for the two projections.

• DOE Contract Number: W-31-109-ENG-38
• OSTI ID: 7177220
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 46:9; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
CRYSTAL STRUCTURE
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
YTTRIUM OXIDES
UMKLAPP PROCESSES
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BASIC INTERACTIONS
CHALCOGENIDES
COPPER COMPOUNDS
ELECTROMAGNETIC INTERACTIONS
INTERACTIONS
OXIDES
OXYGEN COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
665100 - Nuclear Techniques in Condensed Matter Physics - (1992-)