Quasi-particle tunneling spectroscopy of high-Tc cuprates

John Zasadzinski; L. Ozyuzer; Z. Yusof; June Chen; Kenneth E. Gray; Radion Mogilevsky; David G. Hinks; John Cobb; John T. Markert

doi:10.1117/12.241759

10 June 1996 Quasi-particle tunneling spectroscopy of high-T_c cuprates

John Zasadzinski, L. Ozyuzer, Z. Yusof, June Chen, Kenneth E. Gray, Radion Mogilevsky, David G. Hinks, John Cobb, John T. Markert

Author Affiliations +

Proceedings Volume 2696, Spectroscopic Studies of Superconductors; (1996) https://doi.org/10.1117/12.241759
Event: Photonics West '96, 1996, San Jose, CA, United States

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 T_c 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, Sr_1-xNd_xCuO₂ are reported which show a remarkable similarity to another electron-doped cuprate, Nd_1.85Ce_0.85CuO₄. 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 d_x2_-y2 symmetry.

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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-T_c cuprates", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); https://doi.org/10.1117/12.241759

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