Abstract
Piezo force microscopy has been used to visualize nanoscaled surface charge density waves in a modulated ferroelectric system for the first time. Those structures are found in incommensurate systems close to lock-in transition consisting of an ordered sequence of commensurate nanodomains separated by discommensurations. In ferroelectrics, these domains are antiparallel polarized. As a model system, K2ZnCl4 crystals doped with Rb2ZnCl4 is used where the nanodomain structure can be stabilized at room temperature. Lock-in amplifier techniques allow the mapping of domain morphology and also its coarsening in aged crystals. Our results directly confirm earlier molecular dynamics simulations found in the literature.
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