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Quasi-one-dimensional topological-excitation liquid in Bi2Sr2CaCu2O8+x from tunnelling spectroscopy

par Mourachkine, Andrei
Référence Superconductor science and technology, 14, 6, page (329-345)
Publication Publié, 2001-06

Article révisé par les pairs

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Résumé :

Tunnelling measurements have been carried out on heavily underdoped, slightly overdoped and partially Ni-substituted Bi2Sr2CaCu2O8+x (Bi2212) single crystals by using a break-junction technique. We find that in-plane tunnelling spectra below Tc are a combination of the incoherent part from the pseudogap and coherent quasiparticle peaks. There is a clear correlation between the magnitude of the pseudogap and the magnitude of the superconducting gap in Bi2212. Analysis of the data suggests that the tunnelling pseudogap in Bi2212 is predominantly a charge-density-wave gap on dynamical charge stripes. The tunnelling characteristics corresponding to the quasiparticle peaks are in excellent agreement with theoretical predictions made for a quasi-one-dimensional topological-excitation liquid. In addition, analysis of the data measured by different techniques shows that the phase coherence along the c-axis is established at Tc due to spin fluctuations in local antiferromagnetic domains of CuO2 planes.