Evidence for a quasi-1D topological-excitation liquid in from tunneling spectroscopy
Université Libre de Bruxelles - CP 232,
Blvd. du Triomphe, B-1050 Brussels, Belgium
Accepted: 30 May 2001
Tunneling measurements have been carried out on heavily underdoped and slightly overdoped () single crystals by using a break-junction technique. We find that in-plane tunneling spectra below 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 . We find that the quasiparticle conductance peaks are caused by condensed soliton-like excitations.
PACS: 74.25.Jb – Electronic structure / 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 74.72.Hs – -based cuprates
© EDP Sciences, 2001