Abstract
Low-temperature scanning tunneling microscopy has been performed on underdoped Bi2Sr1.4La0.6CuO6+δ (Tc ∼ 29 K) at 4.2 K to observe the non-dispersive spatial modulation of local density of states (LDOS). The LDOS modulation is along the Cu-O-Cu directions and its period is about 4a0, though the period is slightly distributed over the surface. The correlation between the modulation period and the nanoscale electronic inhomogeneity, which is represented by the spatial variation of the low-energy integrated LDOS (ILDOS), was analyzed. The result exhibits clear tendency of that the period in the low-ILDOS region is slightly shorter than that in the high-ILDOS region.
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