Positron annihilation in the high-temperature superconductor YBa2Cu3O6+δ
Y. C. Jean, S. J. Wang, H. Nakanishi, W. N. Hardy, M. E. Hayden, R. F. Kiefl, R. L. Meng, H. P. Hor, J. Z. Huang, C. W. Chu
DOI 10.1103/PhysRevB.36.3994 · Physical Review B
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Abstract
Positron-annihilation lifetime and Doppler broadening energy spectra have been measured in high-temperature superconductors YBa2Cu3O6+δ 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | onset |
| YBa2Cu3O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88 | Pressure not reported | unknown |
| YBa2Cu3O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| ABa2Cu3O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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