J. Hofer, J. Karpinski, et al.
Physica C: Superconductivity and its Applications
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 subgap conductance on HgBa2Ca2Cu3O8+δ (Hg-1223) single crystals (Tc, onset = 110 K) are in fact due to a combination of charging effects (Coulomb staircase) and superconductivity.
J. Hofer, J. Karpinski, et al.
Physica C: Superconductivity and its Applications
S. Karg, G.I. Meijer, et al.
Applied Physics Letters
M. Guilloux-Viry, C. Thivet, et al.
Journal of Crystal Growth
U. Staub, G.I. Meijer, et al.
Physical Review Letters