Positron annihilation in the high-temperature superconductor
- 1 September 1987
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 36 (7), 3994-3996
- https://doi.org/10.1103/physrevb.36.3994
Abstract
Positron-annihilation lifetime and Doppler broadening energy spectra have been measured in high-temperature superconductors as a function of temperature between 10 and 293 K. The observed positron lifetime and Doppler boradening parameter show an onset increase near the superconducting critical temperature ( K). This variation does not exist in a similar nonsuperconducting sample that contains a saturated oxygen vacancy content. These results give evidence that the oxygen vacancy and electronic structure change play an important role for high- superconductivity.
Keywords
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