Abstract
The first systematic study of the nano-scale periodic local density of states (LDOS) and the inhomogeneous gap distributions for the Pb doped Bi2Sr2Ca2Cu3O10 + y (PbBi2223) microcrystals was carried out using the low-temperature scanning tunneling microscopy/spectroscopy. The spatially inhomogeneous gap distributions with patchy structures of several nm size reveal the average gap magnitude Δave ≃ 46 meV with the standard deviation σ = 8 meV. Those features are similar to properties of the widely investigated two-layer Bi-based cuprates. The energy dispersive types of the LDOS modulations are identified as being due to the quasiparticle interference. The relevant scattering vectors seem to testify that the PbBi2223 superconductors are ones, which was shown earlier to be most probable for Bi2212. Three types of energy non-dispersive modulations manifest themselves. Among them, the modulation in the diagonal direction with the period of ∼2.1a0 [ (2π/a0)] seems to be observed for the first time.
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