Positron 2D-ACAR experiments and electron-positron momentum density in YBa{sub 2}Cu{sub 3}O{sub 7-x}

Conference · Sun Dec 01 04:00:00 EST 1991

OSTI ID:10117280

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

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1. Argonne National Lab., IL (United States)
2. Northeastern Univ., Boston, MA (United States). Dept. of Physics

We discuss positron annihilation (2D-ACAR) measurements in the C- projection on an untwinned metallic single crystal of YBa{sub 2}Cu{sub 3}O{sub 7-x} as a function of temperature, for five temperatures ranging from 30K to 300K. The measured 2D-ACAR intensities are interpreted in terms of the electron-positron momentum density obtained within the KKR-band theory framework. The temperature dependence of the 2D-ACAR spectra is used to extract a ``background corrected`` experimental spectrum which is in remarkable accord with the corresponding band theory predictions, and displays in particular clear signatures of the electron ridge Fermi surface.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10117280
• Report Number(s): ANL/CP--75121; CONF-911202--45; ON: DE92006985; CNN: Contract STC-8809854
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204
665100
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
COPPER OXIDES
CRYSTALS
ELECTRON DENSITY
ELECTRONIC STRUCTURE
HIGH-TC SUPERCONDUCTORS
NUCLEAR TECHNIQUES IN CONDENSED MATTER PHYSICS
PHYSICAL PROPERTIES
POSITRONS
TEMPERATURE DEPENDENCE
YTTRIUM OXIDES