Physics – Condensed Matter – Superconductivity
Scientific paper
1999-06-14
Int. J. Mod. Phys. B Vol. 29-31 (1999) p.3721
Physics
Condensed Matter
Superconductivity
4 pages, 2 figures (presented at the Second International Conference on New Theories, Discoveries, and Applications of Superco
Scientific paper
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 a remarkable monotonic dependence on doping, increasing to very large values in the underdoped region even as T_c decreases. This leads to unphysically large values of the strong coupling ratio ($\sim$20). The tunneling spectra are qualitatively similar over the entire doping range even though the gap parameter, $\Delta$, changes from 12 meV to 60 meV. Each spectrum exhibits dip and hump features at high bias with characteristic energies that scale with the superconducting gap. Tunneling spectra of near optimally-doped Tl_{2}Ba_{2}CuO_{6+\delta} (Tl-2201) also display a weak dip feature in superconductor-insulator-normal metal (SIN) junctions. Generated SIS spectra of Tl-2201 are compared with measured spectra on Bi-2212 and it is concluded that the dip and hump features are generic to high temperature superconductors.
Miyakawa Noriaki
Ozyuzer Lutfi
Zasadzinski John F.
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