Fluctuating superconductivity and absence of charge order in heavily overdoped cuprate Bi-2212*

We identify significant superconducting fluctiations on a single coherent, hole-like Fermi surface in heavily overdoped cuprate superconductor Bi-2212. No evidence of pseudogap or valence electron charge order are found in the meantime. Both ampitude and phase fluctuations are quantitatively estimated via measurements of resisitivity anisotropy, specific heat jump, and superconducting coherent length. The important role of the quasi-two-dimensional flat band and the van Hove singularity are discussed in the end.