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(a) Atomically resolved STM topography taken on a cleaved single crystal (the area shown is ). (b) The line profile reflects the height along the blue line in the topography image. (c) The FFT of the topographic image (a) indicates a square arrangement of the surface atoms with average distance of 3.7 Å.
(a) STM topography over an area of on a single crystal indicating stripe formation. (b) Atomic resolution observed on a different area (size of ) suggests a surface reconstruction. (c) The line profile taken along the blue line in (b) clearly reveals two different distances between the surface atoms (indicated by arrows) of approximately 3.6 Å and 5.1 Å, respectively. The tunneling parameters are the same as for Fig. 1.
(a) Topography (, , ) and (b) its FFT exhibiting a nearly hexagonal arrangement of the manganite surface atoms. The prominent line in the FFT is an artifact caused by the horizontal fast scanning direction.
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