Abstract
We have performed a systematic high energy (7–11 meV) and momentum (0.01 Å −1) resolution angle-resolved photoemission spectroscopy (ARPES) on superstructure-free Bi 1.80Pb 0.38Sr 2.01CuO 6−δ with various dopings. All the samples from overdoped T c = 0K to underdoped T c = 18K possess a large hole-like Fermi surface centered at X point, whose volume shows a systematic evolution with doping. The superconducting gap exhibits a d x 2− y 2 -like anisotropy with a typical gap value of 10–15 meV. By comparing with Bi 2Sr 2CaCu 2O 8, we found that the size of superconducting gap and the ARPES spectral feature near E F are well scaled with the maximum T c ( T c max ). This suggests that the superconducting properties are characterized by T c max irrespective of the number of CuO 2 layers or the structural modulation in BiO layer.
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