We report an ultrahigh-resolution angle-resolved photoemission spectroscopy on superstructure-free Bi1.80Pb0.38Sr2.01CuO6−δ with various hole concentrations. The Fermi surface retains a holelike character centered at (Π, Π) from under-to overdoping. The superconducting gap exhibits a dx2−y2-like anisotropy with a typical gap value of 10-15 meV near (Π, 0). Comparison with Bi2Sr2CaCu2O8 shows that the size of the superconducting gap and the energy of the hump structure near EF are well scaled with the maximum Tc(Tmaxc). This suggests that the superconducting properties are essentially characterized by Tmaxc irrespective of the number of CuO2 layers or the BiO superstructure.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2001|