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Understanding of the puzzling phenomenon of high temperaturesuperconductivity requires reliable spectroscopic information about temperaturedependence of the bulk electronic density of states. Here I present acomprehensive analysis of $T-$evolution of bulk electronic spectra in Bi-2212obtained by Intrinsic Tunneling Spectroscopy on small mesa structures.Unambiguous spectroscopic information is obtained by obviation of self-heatingproblem and by improving the spectroscopic resolution. The obtained dataindicate that the superconducting transition maintains the mean-field characterdown to moderate underdoping, and is associated with an abrupt opening of thesuperconducting gap, which is well described by the conventional BCS$T-$dependence. The mean-field critical temperature reaches maximum at theoptimal doping and decreases with underdoping. Such behavior is inconsistentwith theories assuming intimate connection between superconducting andantiferromagnetic spin gaps, and support proposals associating high temperaturesuperconductivity with the presence of competing ground states and a quantumcritical point near optimal doping.

Temperature dependence of the bulk energy gap in underdoped Bi-2212: Evidence for the mean-field superconducting transition