Large pseudogap and nodal superconducting gap in Bi2Sr_[2-x]LaxCuO_[6+δ] and Bi2Sr2CaCu2O_[8+δ] : Scanning tunneling microscopy and spectroscopy

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In the present work, scanning tunneling microscopy/spectroscopy (STM/STS) measurements were carried out on underdoped Bi2Sr_[2-x]LaxCuO_[6+δ] and Bi2Sr2CaCu2O_[8+δ] to clarify the origin of the pseudogap, in particular, the inhomogeneous large pseudogap. The nodal part of a d-wave pairing gap, which is under no influence of the inhomogeneous large pseudogap, was also examined by relating the homogeneous bottom part of the STS gap to a nodal d-wave gap in momentum space. We report that the inhomogeneous large pseudogap in the antinodal region links to a two-dimensional electronic charge order, and that the gap size of the nodal d-wave part Δsc scales with the superconducting critical temperature Tc in the pseudogap regime.
2010-03-01