No far-infrared-spectroscopic gap in clean and dirty high-Tc superconductors
D. Mandrus, Michael C. Martin, C. Kendziora, D. Koller, L. Forro, L. Mihaly
DOI 10.1103/PhysRevLett.70.2629 · Physical Review Letters
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Abstract
We report far-infrared transmission measurements on single crystal samples derived from Bi2Sr2CaCu2O8. The impurity scattering rate of the samples was varied by electron-beam irradiation, 50 MeV O+616 ion irradiation, heat treatment in vacuum, and Y doping. Although substantial changes in the infrared spectra were produced, in no case was a feature observed that could be associated with the superconducting energy gap. These results all but rule out ‘‘clean limit’’ explanations for the absence of the spectroscopic gap in this material, and provide evidence that the superconductivity in Bi2Sr2CaCu2O8 is gapless.
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. | 84 | Pressure not reported | unknown |
| Bi2Sr2Ca1-xYxCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | unknown |
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