Tunnel-like characteristics of YBa2Cu3O7−y/CeO2/YBa2Cu3O7−y junctions and possible evidence of excitations responsible for high-Tc superconductivity
I. Iguchi, T. Kusumori
DOI 10.1103/PhysRevB.46.11175 · Physical Review B
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Abstract
The tunnel-like characteristics observed in YBa2Cu3O7−y/CeO2/YBa2Cu3O7−y heteroepitaxial junctions fabricated by a vacuum evaporation technique are reported. Pronounced gaplike structures around 9 and 20 mV, which depend on temperature and the additional structures at high-bias voltages (40–180 mV), are observable. The latter structures emerge rapidly near Tc and may reflect the density of states of the possible excitations responsible for high-Tc superconductivity. The data suggest that the excitations other than phonons are possible.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | onset |
| YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | zero_resistance |
| Ba1-xKxBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nd2-xCexCuO4 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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