Is there a pair density wave in superconducting $\mathrm{CsV_3Sb_5}$?
In plain words
Tunneling microscopy saw the superconducting gap of $\mathrm{CsV_3Sb_5}$ oscillate in space with a new period, which could be a pair density wave or a side effect of the charge order.
Precise statement
Determine whether the $4a/3$ spatial modulation of the superconducting gap reported by STM in $\mathrm{CsV_3Sb_5}$ (2021) is an independent pair-density-wave order parameter or a modulation of the uniform condensate induced by the charge-density wave. An answer is a test of whether the modulation survives when the charge order is suppressed or changed (by pressure or substitution) and whether it has its own phase coherence.
What would settle it
STM or scanned Josephson measurements tracking the modulation across samples with tuned charge order.
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