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10 June 1996 Quasi-particle tunneling spectroscopy of high-Tc cuprates
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Superconductor-insulator-normal metal (SIN) and superconductor-insulator-superconductor (SIS) tunnel junctions provide important information on pairing state symmetry and mechanism. Measurements of such junctions on high Tc superconductors (HTS) are reported using mechanical point contacts, which generally display the optimum characteristics that can be obtained from HTS native-surface tunnel barriers. New tunneling data on the infinite-layer cuprate, Sr1-xNdxCuO2 are reported which show a remarkable similarity to another electron-doped cuprate, Nd1.85Ce0.85CuO4. In particular, there is a strong, asymmetric linear background conductance that is indicative of inelastic tunneling from a continuum of states. A discussion is given of the anomalous 'dip' feature found in the tunneling and photoemission data on BSCCO 2212. It is shown that a similar feature is found in many cuprate junctions and that this dip scales with the gap energy over a wide range. New data on the single-layer, tetragonal cuprate, Tl2Ba2CuO6 (Tl2201) are presented and discussed in light of recent published results on the similar compound HgBa2CuO4 (Hg1201). The Hg1201 data display a low, flat sub-gap tunneling conductance which is consistent with a BCS density of states whereas the Tl2201 data display a cusp-like feature at zero bias which is more consistent with dx2-y2 symmetry.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John Zasadzinski, L. Ozyuzer, Z. Yusof, June Chen, Kenneth E. Gray, Radion Mogilevsky, David G. Hinks, John Cobb, and John T. Markert "Quasi-particle tunneling spectroscopy of high-Tc cuprates", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996);


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