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We report far infrared transmission measurements on single crystal samplesderived from Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8}$. The impurity scattering rate ofthe samples was varied by electron-beam irradiation, 50MeV $^{16}$O$^{+6}$ ionirradiation, heat treatment in vacuum, and Y doping. Although substantialchanges in the infrared spectra were produced, in no case was a featureobserved that could be associated with the superconducting energy gap. Theseresults all but rule out ``clean limit'' explanations for the absence of thespectroscopic gap in this material, and provide evidence that thesuperconductivity in Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8}$ is gapless.Comment: 4 pages and 3 postscript figures attached. REVTEX v3.0. Accepted for  publication in Phys. Rev. Lett. IRDIRT

physical review letters

No far-infrared-spectroscopic gap in clean and dirty high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">T</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superconductors

No far-infrared-spectroscopic gap in clean and dirty high-Tcsuperconductors