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Scanning tunneling microscopy and spectroscopy have been performed onsuperconducting La$_{2-x}$Sr$_{x}$CuO$_{4}$ ($x=0.06, 0.12, 0.16$, and 0.21) at4.2 K. Atomically resolved surface topography has been observed on the $ab$surface, which exhibits a one-dimensional structure corresponding to thebuckling pattern of the orthorhombic phase. The tunneling spectra of allsamples exhibit kinks at about $\pm 5$ meV in addition to the energy gap,indicating the existence of two energy scales. While the gap magnitude varieson the length scale of a few nm and steadily increases upon underdoping, thekink energy is spatially uniform on the surface and almost independent of thedoping level.

Doping Dependence of Two Energy Scales in the Tunneling Spectra of Superconducting La$_{2-x}$Sr$_{x}$CuO$_{4}$