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Proceedings Paper

Quasi-particle tunneling spectroscopy of high-Tc cuprates
Author(s): John Zasadzinski; L. Ozyuzer; Z. Yusof; June Chen; Kenneth E. Gray; Radion Mogilevsky; David G. Hinks; John Cobb; John T. Markert
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Paper Abstract

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.

Paper Details

Date Published: 10 June 1996
PDF: 9 pages
Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); doi: 10.1117/12.241759
Show Author Affiliations
John Zasadzinski, Illinois Institute of Technology (United States)
L. Ozyuzer, Illinois Institute of Technology (United States)
Z. Yusof, Illinois Institute of Technology (United States)
June Chen, Argonne National Lab. (United States)
Kenneth E. Gray, Argonne National Lab. (United States)
Radion Mogilevsky, Argonne National Lab. (United States)
David G. Hinks, Argonne National Lab. (United States)
John Cobb, Univ. of Texas/Austin (United States)
John T. Markert, Univ. of Texas/Austin (United States)

Published in SPIE Proceedings Vol. 2696:
Spectroscopic Studies of Superconductors
Ivan Bozovic; Dirk van der Marel, Editor(s)

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