Positron annihilation study on Y-Ba-Cu-O high-Tc superconductors
A. G. Balogh, W. Puff, L. Liszkay, B. Molnár
DOI 10.1103/PhysRevB.38.2883 · Physical Review B
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Abstract
Detailed positron annihilation measurements are reported on high-Tc superconductors YBa2Cu3O7−x. The lifetime and Doppler-broadening spectra show a significant change at about 240 K indicating a structural change in the sample far above 90 K where the resistance falls to zero. An analysis of the lifetime spectra shows positron trapping without any sign of saturation, indicating low specific trapping rates. On this basis, the charge states of Cu-O structures and a possible local charge decomposition are discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure not reported | unknown |
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | unknown |
| Nb3Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23.2 | Pressure not reported | unknown |
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