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Quasi-Periodic Growth of One-Dimensional Copper Boride on Cu(110)
An unexplored material
of copper boride has been realized
recently
in two-dimensional form at a (111) surface of the fcc copper crystal. Here, one-dimensional (1-D) boron growth was observed
on the Cu(110) surface, as probed by atomically resolved scanning
probe microscopy. The 1-D copper boride was composed of quasi-periodic
atomic chains periodically aligned parallel to each other, as confirmed
by Fourier transform analysis. The 1-D growth unexpectedly proceeded
across surface steps in a self-assembled manner and extended over
several 100 nm. The long-range formation of a 1-D quasi-periodic structure
on a surface has been theoretically modeled as a 1-D quasi-crystal
and the predicted conditions matched the structural parameters obtained
by the experimental work here. The quasi-periodic 1-D copper boride
system enabled a way to examine 1-D quasi-crystallinity on an actual
material