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We use scanning tunneling microscopy to study the lithium purple bronze(Li$_{0.9}$Mo$_{6}$O$_{17}$) at room temperature. Our measurements allow us toidentify the single-crystal cleave plane and show that it is possible to obtainclean cleaved surfaces reflecting the crystal structure without thecomplications of nanoscale surface disorder. In addition to the crystallattice, we observe a coexisting discommensurate superlattice with wavevectorsq = 0.5a* $\pm$ 0.25b*. We propose that the origin of the superstructure is asurface reconstruction which is driven by cleaving along a crystal plane whichcontains in-plane MoO$_{4}$ tetrahedra connected to out-of-plane MoO$_{6}$octahedra through corner-sharing oxygens. When combined with spectroscopicmeasurements, our studies show a promising avenue through which to study thecomplex physics within Li$_{0.9}$Mo$_{6}$O$_{17}$.

Origin of a Superlattice Observed in Li$_{0.9}$Mo$_{6}$O$_{17}$ by Scanning Tunneling Microscopy