Comment on "Evidence for Coexistence of the Gap and the Pseudogap in Bi-2212 from Intrinsic Tunneling Spectroscopy"

Abstract

It is argued that the superconducting and pseudogaps represent different coexisting phenomena, and this observation speaks against the precursor-superconductivity scenario of the pseudogap; see, V.M. Krasnov et al., Phys. Rev. Lett. 84, 5860 (2000). We present brief comments showing that the experimental facts of this paper do not contradict to the observations that the pseudogap in underdoped Bi-2212 smoothly evolves into a pseudogap above critical temperature $T_c$, and the large energy gap below $T_c$ is mainly of superconducting origin. We show that appearance of this pseudogap is closely related to a new energy scale observed recently.