Abstract
The surface structure of the first inorganic spin-Peierls material ${\mathrm{CuGeO}}_{3}$ has been investigated by atomic force microscopy. The $\mathrm{bc}$ surface of ${\mathrm{CuGeO}}_{3}$ single crystals grown by the floating-zone method was easily prepared by cleavage, where we found extraordinarily flat terraces compared to other oxide materials. One of the large-area images demonstrates that two atomically flat surfaces spread over micrometers, which are separated by a monolayer step of 4 \AA{} height. A narrow-area image also reveals a unique structure of ${\mathrm{CuGeO}}_{3},$ where we found that the one-dimensional atomic row image of Cu-O is observed everywhere on the terraces. The model structure consistent with the observed image is proposed and the surface stability is discussed in detail.
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