Measurement of the energy gap in oxygen-annealed Bi2Sr2CaCu2O8+δ high-Tc superconductors by tunneling spectroscopy
Zhe Zhang, Charles M. Lieber
DOI 10.1103/PhysRevB.47.3423 · Physical Review B
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Abstract
The superconducting energy gap has been determined in homogeneous, oxygen-annealed Bi2Sr2CaCu2O8+δ (BSCCO) single crystals by tunneling spectroscopy. Normal-metal–insulator– superconductor (NIS) point-contact tunneling measurements made on cleaved surfaces of these BSCCO crystals exhibit a well-defined gap with a low conductance, G(V), within the gap region. The conductance and change of G(V) within the gap region differs from the behavior expected for either a gapless or BCS-like superconductor. Analysis of data from both NIS and superconductor-insulator-superconductor junctions provides a consistent scale for superconductivity with 2Δ≊6.8kTc. In addition, since this gap structure is reproducible at different surface positions of these oxygen-annealed crystals we conclude that spatial variations in 2Δ and a high density of states within the gap are not intrinsic to the BSCCO system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7 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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