No Far-Infrared-Spectroscopic Gap in Clean and Dirty High-T$_C$ Superconductors

Details No Far-Infrared-Spectroscopic Gap in Clean and Dirty High-T$_C$ Superconductors No Far-Infrared-Spectroscopic Gap in Clean and Dirty High-T$_C$ Superconductors

1993-03-19

arxiv.org/abs/cond-mat/9303033v1

Phys. Rev. Lett. 70, 2629 (1993)

Physics

Condensed Matter

4 pages and 3 postscript figures attached. REVTEX v3.0. Accepted for publication in Phys. Rev. Lett. IRDIRTY

Scientific paper

10.1103/PhysRevLett.70.2629

We report far infrared transmission measurements on single crystal samples derived from Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8}$. The impurity scattering rate of the samples was varied by electron-beam irradiation, 50MeV $^{16}$O$^{+6}$ 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 Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8}$ is gapless.

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