Abstract
Positron-annihilation lifetime and Doppler broadening energy spectra have been measured in high-temperature superconductors YBa2Cu3O6+ as a function of temperature between 10 and 293 K. The observed positron lifetime and Doppler boradening S parameter show an onset increase near the superconducting critical temperature (Tc=90 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-Tc superconductivity.
Original language | English |
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Pages (from-to) | 3994-3996 |
Number of pages | 3 |
Journal | Physical Review B |
Volume | 36 |
Issue number | 7 |
DOIs | |
Publication status | Published - 1987 |
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics