The density waves that develop in kagome metals ${\mathrm{ScV}}_6{\mathrm{Sn}}_6$ and ${\mathrm{LuNb}}_6{\mathrm{Sn}}_6$ at low temperature appear to arise from underfilled atomic columns within a V-Sn or Nb-Sn scaffolding. Compressing this network with applied pressure in ${\mathrm{ScV}}_6{\mathrm{Sn}}_6$ suppressed the structural transition temperature by constraining atomic rattling and inhibiting the shifts that define the structural modulation. We predicted that the density wave transition in ${\mathrm{LuNb}}_6{\mathrm{Sn}}_6$ at 68 K would be suppressed by pressure as well. In this Letter, we examine the pressure dependence of the density wave transition by measuring resistance vs temperature up to 2.26 GPa. We found the transition temperature is smoothly depressed and disappears around 1.9 GPa. This result not only addresses our prediction, but strengthens the rattling chains origin of structural instabilities in the ${\mathrm{HfFe}}_6{\mathrm{Ge}}_6$-type kagome metals.

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• Charge density waves
• High-pressure studies
• Phase transitions
• Kagome metal
• Single crystal materials