  Tunneling measurements have been carried out on heavily underdoped and
slightly overdoped Bi2212 single crystals by using a break-junction technique.
We find that in-plane tunneling spectra below Tc are the combination of
incoherent part from the pseudogap and coherent quasiparticle peaks. There is a
correlation between the magnitude of the pseudogap and the magnitude of the
superconducting gap in Bi2212. We find that the quasiparticle conductance peaks
are caused by condensed solitonlike excitations.
