The influence of twinning in YBa/sub 2/Cu/sub 3/O/sub 7/ on positron annihilation parameters
Positron annihilation spectroscopy has been applied to the study of the high temperature superconductor YBa/sub 2/Cu/sub 3/O/sub 7/minus/delta/; delta = 0.1. Both positron lifetime and Doppler line shape measurements have been completed. Initial experiments revealed a correlation between a decrease in the line shape parameter S and the superconducting transition temperatures (T/sub c/) of YBa/sub 2/Cu/sub 3/O/sub 7/ (T/sub c/ = 90 K) and YBa/sub 2/Cu/sub 3/O/sub 6.6/ (T/sub c/ = 46 K). In YBa/sub 2/Cu/sub 3/O/sub 7/ the positron lifetime was also found to decrease at and below T/sub c/. More recent work revealed a different temperature dependence for the Doppler line shape parameter S. The physical origin of these samples dependent differences and their relevance to superconductivity is under investigation. Preliminary work suggest the differences be related to crystal twinning. 11 refs., 2 figs., 3 tabs.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6565663
- Report Number(s):
- BNL-41323; CONF-8808122-14; ON: DE89004518
- Country of Publication:
- United States
- Language:
- English
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Temperature and depth dependence of positron annihilation parameters in YBa/sub 2/Cu/sub 3/O/sub 7-. / and La/sub 1. 85/Sr/sub 0. 15/CuO/sub 4/
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANNIHILATION
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BASIC INTERACTIONS
CHALCOGENIDES
CRITICAL TEMPERATURE
DOPPLER EFFECT
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
FERMIONS
INTERACTIONS
LEPTONS
LIFETIME
LINE WIDTHS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POSITRONS
SPECTROSCOPY
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TWINNING
YTTRIUM COMPOUNDS
YTTRIUM OXIDES