Tunneling measurement of the energy gaps in the superconductors Y-Ba-Cu-O and Tl-Ba-Ca-Cu-O
Wang Lanping, He Jian, Wang Guowen
DOI 10.1103/PhysRevB.40.10954 · Physical Review B
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Abstract
Reported here are the results of point-contact electron-tunneling measurements in the high-Tc superconductors YBa2Cu3O7−δ and Tl2Ba2Ca2Cu3O10+δ. The ratio 2Δ/kTc is 4.0–5.8 (probability maximum near 4.8) for Y-Ba-Cu-O and 4.6 for Tl-Ba-Ca-Cu-O. Both are consistent with strong-coupling superconductivity. The measurements at 600 different locations of the same sample of YBa2Cu3O7−δ were performed. The energy distribution of energy gaps with the regularity of the ratio 1:3:5 reported by Kirk et al. have not been seen in our experiment.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | unknown |
| Tl2Ba2Ca2Cu3O10+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 116 | Pressure not reported | unknown |
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