Anomalous Gap Structures in HgBa2Ca2Cu3O8+delta Single Crystals Measured by Scanning Tunneling Spectroscopy

Scanning tunneling spectroscopy on high-Tc superconductors with nonideal surfaces can generate misleading results. We demonstrate that reproducible BCS-like gap structures with sharp peaks and very flat sub-gap conductance on HgBa(2)Ca(2)Cu(3)O(8+delta) (Hg-1223) single crystals Tc, onset=110~K) are in fact due to a combination of charging effects (Coulomb staircase) and superconductivity.

By: G. I. Meijer, C. Rossel, J. Karpinski (ETH, Switz.), H. Schwer (ETH, Switz.), R. Molinski (ETH, Switz.) and K. Conder (ETH, Switz.)

Published in: Czechoslovak Journal of Physics, volume 46, (no S3), pages 1347-8 in 1996

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