Tunneling Spectroscopy of c-Axis Y1−xCaxBa2Cu3O7−δ Thin-Film Superconductors
J. H. Ngai, W. A. Atkinson, J. Y. T. Wei
DOI 10.1103/PhysRevLett.98.177003 · Physical Review Letters
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Abstract
Scanning tunneling spectroscopy was performed on c-axis Y1−xCaxBa2Cu3O7−δ thin films for x=0, 0.05, 0.15, and 0.20 at 4.2 K. The measured spectra show main-gap, subgap, and satellite features which scale similarly in energy versus Ca doping, suggesting that they are associated with a single pairing energy. The data are analyzed with a multiband tunneling model which attributes the subgap features to the chain band and the satellite and main-gap features to the plane band for dx2−y2+s pairing symmetry. These results suggest that the superconductivity in Y1−xCaxBa2Cu3O7−δ involves multiple bands.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y1-xCaxBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89 | Pressure not reported | unknown |
| Y1-xCaxBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | unknown |
| Y1-xCaxBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 81 | Pressure not reported | unknown |
| Y1-xCaxBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 78 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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