Positron-annihilation studies on the YBa sub 2 Cu sub 4 O sub 8 superconductor

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

DOI:https://doi.org/10.1103/PhysRevB.41.11685· OSTI ID:7093686

Sundar, C S; Bharathi, A; Jean, Y C ^[1]; Hor, P H; Meng, R L; Xue, Y Y; Huang, Z J; Chu, C W ^[2]

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1. University of Missouri-Kansas City, Kansas City, Missouri 64110 (USA)
2. Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-5506 (USA)

Positron-lifetime and Doppler-broadened annihilation-radiation line-shape parameter {ital S} in YBa{sub 2}Cu{sub 4}O{sub 8} are observed to decrease with temperature below {ital T}{sub {ital c}}. The calculation of the positron-density distribution shows that the maximum of the positron density is in the region between the Cu-O double chains. The correlation between the temperature dependence of annihilation parameters and the positron-density distribution is discussed. The decrease in annihilation parameters below {ital T}{sub {ital c}} is understood in terms of a local electron transfer from the CuO{sub 2} layers to the Cu-O chains in the superconducting state.

• OSTI ID: 7093686
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:16; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANNIHILATION
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BARIUM COMPOUNDS
BARIUM OXIDES
BASIC INTERACTIONS
CHALCOGENIDES
CHARGE EXCHANGE
COPPER COMPOUNDS
COPPER OXIDES
ELECTROMAGNETIC INTERACTIONS
ELECTRON TRANSFER
ELEMENTARY PARTICLES
FERMIONS
HIGH-TC SUPERCONDUCTORS
INTERACTIONS
LEPTONS
OXIDES
OXYGEN COMPOUNDS
POSITRONS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES