Abstract
Scanning tunneling spectroscopy on high-T c superconductors with nonideal surfaces can generate misleading results. We demonstrate that reproducible BCS-like gap structures with sharp peaks and very flat subgap conductance on HgBa2Ca2Cu3O8+δ (Hg-1223) single crystals (T c ,onset=110 K) are in fact due to a combination of charging effects (Coulomb staircase) and superconductivity.
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