Dependence of the energy gap on Tc: Absence of scaling in the copper oxide superconductors
Yonghong Li, Jie Liu, Charles M. Lieber
DOI 10.1103/PhysRevLett.70.3494 · Physical Review Letters
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Abstract
High-resolution electron energy loss spectroscopy has been used to investigate the energy gap (2Δ) in a series of oxygen-doped Bi2Sr2CaCu2O8+δ single crystals with critical temperatures ranging from 71 to 94 K. Temperature dependent energy loss spectra demonstrate that 2Δ develops sharply for T<Tc in all of the samples, and that the magnitude of 2Δ exceeds significantly 3.5kTc. Furthermore, 2Δ decreases only slightly as Tc is reduced from 94 to 71 K, and thus, 2Δ/kTc increases systematically as Tc decreases. These results indicate that Tc may be reduced significantly by strong inelastic scattering in the current copper oxides.
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. | 94 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 94 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 77 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 77 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 71 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 71 | Pressure not reported | unknown |
| YBa2Cu3O7-δ 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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