Kavli Affiliate: Katja C. Nowack
| First 5 Authors: Austin Kaczmarek, Andrea Capa Salinas, Stephen D. Wilson, Katja C. Nowack,
| Summary:
We report measurements of the local temperature-dependent penetration depth,
$lambda(T)$, in the Kagome superconductors AV$_3$Sb$_5$ (A = Cs, K, Rb) using
scanning superconducting quantum interference device (SQUID) microscopy. Our
results suggest that the superconducting order in all three compounds is fully
gapped, in contrast to reports of nodal superconductivity in KV$_3$Sb$_5$ and
RbV$_3$Sb$_5$. Analysis of the temperature-dependent superfluid density,
$rho_s(T)$, shows deviations from the behavior expected for a single isotropic
gap, but the data are well described by models incorporating either a single
anisotropic gap or two isotropic gaps. Notably, the temperature dependences of
$lambda(T)$ and $rho_s(T)$ in KV$_3$Sb$_5$ and RbV$_3$Sb$_5$ are
qualitatively more similar to each other than to CsV$_3$Sb$_5$, consistent with
the superconducting phase reflecting features of the normal-state band
structure. Our findings provide a direct comparison of the superconducting
properties across the AV$_3$Sb$_5$ family.
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