Fermi surface and superconducting gap in superstructure-free Bi1.80Pb0.38Sr2.01CuO6-delta - art. no. 132502

We report an ultrahigh-resolution angle-resolved photoemission spectroscopy on superstructure-free Bi1.80Pb0.38Sr2.01CuO6-delta. With various hole con centrations. The Fermi surface retains a holelike character centered at (pi , pi) from under- to overdoping. The superconducting gap exhibits a d(x2-y2 )-like anisotropy with a typical gap value of 10-15 meV near (pi, 0). Compa rison with Bi2Sr2CaCu2O8 shows that the size of the superconducting gap and the energy of the hump structure near E-F are well scaled with the maximum T-c( T-c(max)). This suggests that the superconducting properties are esse ntially characterized by T-c(max) irrespective of the number of CuO2 layers or the BiO superstructure.