Evidence for reduced periodic lattice distortion within the Sb-terminated surface layer of the kagome metal CsV$_3$Sb$_5
The discovery of the kagome metal CsV$_3$Sb$_5$ sparked broad interest, due to the coexistence of a charge density wave (CDW) phase and possible unconventional superconductivity in the material. In this study, we use low-energy electron diffraction (LEED) with a $\mu$m-sized electron beam to explore...
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Zusammenfassung: | The discovery of the kagome metal CsV$_3$Sb$_5$ sparked broad interest, due
to the coexistence of a charge density wave (CDW) phase and possible
unconventional superconductivity in the material. In this study, we use
low-energy electron diffraction (LEED) with a $\mu$m-sized electron beam to
explore the periodic lattice distortion at the antimony-terminated surface in
the CDW phase. We recorded high-quality backscattering diffraction patterns in
ultrahigh vacuum from multiple cleaved samples. Unexpectedly, we did not find
superstructure reflexes at intensity levels predicted from dynamical LEED
calculations for the reported $2 \times 2 \times 2$ bulk structure. Our results
suggest that in CsV$_3$Sb$_5$ the periodic lattice distortion accompanying the
CDW is less pronounced at Sb-terminated surfaces than in the bulk. |
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DOI: | 10.48550/arxiv.2412.02599 |