Probing (Bi0.92Pb0.17)2Sr1.91Ca2.03Cu3.06O10+δ superconductors from 30 to 300 K by positron-lifetime measurements
D. Sanyal, D. Banerjee, Udayan De
DOI 10.1103/PhysRevB.58.15226 · Physical Review B
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Abstract
The present measurement of positron annihilation lifetimes for the high-Tc superconductor (Bi0.92Pb0.17)2Sr1.91Ca2.03Cu3.06O10+δ or (Bi,Pb)-2223, as a function of temperature, has been inspired by our recent DBPARL (Doppler-broadened positron annihilation radiation line shape) finding of a step and minima in the region around Tc(R=0)=104 K, in the variation with temperature, of the fraction of low momentum electrons at the annihilation sites. The positron annihilation lifetime in the superconductor probes the number density of electrons at the annihilation sites. The present work observes a reduction of lifetime components in the Tc region. Significant changes in the lifetime components in other temperature regions have also been observed and discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Bi0.92Pb0.17)2Sr1.91Ca2.03Cu3.06O10+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 104 | Pressure not reported | zero_resistance |
| (Bi0.92Pb0.17)2Sr1.91Ca2.03Cu3.06O10+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 104 | Pressure not reported | unknown |
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