Temperaure dependence of the energy gap in Bi2Sr2CaCu2O8 superconductors by high-resolution electron-energy-loss spectroscopy
Yonghong Li, Jin Lin Huang, Charles M. Lieber
DOI 10.1103/PhysRevLett.68.3240 · Physical Review Letters
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Abstract
High-resolution electron-energy-loss spectroscopy has been used to determine the magnitude and temperture dependence of the energy gap for oxygen annealed Bi2Sr2CaCu2O8 single crystals. Below the Tc, low-energy excitations are detected in the energy-loss spectra. These spectra are proportional to the frequency-dependent resistivity, ρ(ω), and thus the energy gap can be determined directly from the onset of ρ(ω). We find that at low temperature 2Δ=6kTc and that Δ develops sharply for T<Tc. The similarity of these results to the predictions of models that consider spin interactions suggests that higher Tc’s may be obtainable in this material.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88.5 | Pressure not reported | unknown |
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