Scanning tunneling microscopy and spectroscopy study of 4a×4a electronic charge order and the inhomogeneous pairing gap in superconducting Bi2Sr2CaCu2O8+δ

Abstract

We performed scanning tunneling microscopy and scanning tunneling spectroscopy (STS) measurements on underdoped Bi2212 crystals with doping levels p∼0.11, ∼0.13, and ∼0.14 to examine the nature of the nondispersive 4a×4a charge order in the superconducting state at T⪡Tc. The charge order appears conspicuously within the pairing gap, and low doping tends to favor the charge order. We point out the possibility that the 4a×4a charge order will be dynamical in itself, and pinned down over regions with effective pinning centers. The pinned 4a×4a charge order is closely related to the spatially inhomogeneous pairing gap structure, which has often been reported in STS measurements on high-Tc cuprates.

Source-reported materials — not catalogue approval

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