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Tunneling spectra are reported for Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta} (Bi-2212)over a wide doping range using superconductor-insulator-superconductor (SIS)break junctions. The energy gap inferred from the tunneling data displays aremarkable monotonic dependence on doping, increasing to very large values inthe underdoped region even as T_c decreases. This leads to unphysically largevalues of the strong coupling ratio ($\sim$20). The tunneling spectra arequalitatively similar over the entire doping range even though the gapparameter, $\Delta$, changes from 12 meV to 60 meV. Each spectrum exhibits dipand hump features at high bias with characteristic energies that scale with thesuperconducting gap. Tunneling spectra of near optimally-dopedTl_{2}Ba_{2}CuO_{6+\delta} (Tl-2201) also display a weak dip feature insuperconductor-insulator-normal metal (SIN) junctions. Generated SIS spectra ofTl-2201 are compared with measured spectra on Bi-2212 and it is concluded thatthe dip and hump features are generic to high temperature superconductors.Comment: 4 pages, 2 figures (presented at the Second International Conference  on New Theories, Discoveries, and Applications of Superconductors and Related  Materials, (May 31-June 4) in Las Vegas, NV

international journal of modern physics b/international journal of modern physics b

TUNNELING SPECTRA AND SUPERCONDUCTING GAP IN Bi2Sr2CaCu2O8+δ AND Tl2Ba2CuO6+δ