A sharp peak in the self-field critical current upon the suppression of charge order in CsV₃Sb₅

The kagome metal CsV₃Sb₅ exhibits a charge density wave (CDW) and superconductivity that are amendable by hydrostatic pressure. As the CDW phase is rapidly suppressed under pressure, a double-dome pressure dependence of the superconducting transition temperature (T_c) is observed, with T_c peaking near the suppression pressure p^∗ ≈ 20 kbar. Here, the self-field critical current (I_c,sf ) is adopted to examine CsV₃Sb₅ very close to the absolute zero temperature. We find that I_c,sf in the zero temperature limit, I_c,sf(0), shows a substantial enhancement near p^∗. Such a peak in I_c,sf(0) resembles the findings in other systems in which a superconducting dome is located at the border of magnetism, hinting at the presence of enhanced CDW fluctuations associated with the suppression of the CDW phase in CsV₃Sb₅.