Sensitivity of probing local electron density distributions in high temperature superconductors using positrons

Journal Article · · Applied Physics Communications; (USA)

OSTI ID:6181442

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

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1. Univ. of Missouri, Kansas City (USA)
2. Univ. of Houston, TX (USA)

When an energetic positron (E {approx equal} 150 keV) is injected into high T{sub c} superconductors, it slows down to a thermal state in picoseconds and then distributes in the lattices of the bulks but is more populated near the sites of open spaces and defects. By measuring the positron annihilation lifetime, Doppler broadening energy spectra and angular correlation of annihilation radiation, the authors are able to obtain unique information about the local electron density and momentum distributions in high T{sub c} superconductors. Recent results show that the positron is particularly sensitive to the electron density distribution near the CuO{sub 2} layers of perovskite materials. New insight on the electron (current) density changes and high T{sub c} superconductivity is presented.

• OSTI ID: 6181442
• Journal Information: Applied Physics Communications; (USA), Vol. 10:1-2; ISSN 0277-9374
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
HIGH-TC SUPERCONDUCTORS
ELECTRON DENSITY
ANGULAR CORRELATION
CUPRATES
DISTRIBUTION FUNCTIONS
ENERGY SPECTRA
KEV RANGE 100-1000
POSITRON CHANNELING
CHANNELING
COPPER COMPOUNDS
CORRELATIONS
ENERGY RANGE
FUNCTIONS
KEV RANGE
OXYGEN COMPOUNDS
SPECTRA
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
656003 - Condensed Matter Physics- Interactions between Beams & Condensed Matter- (1987-)
656100 - Condensed Matter Physics- Superconductivity