Abstract
We report the charge doping of KCr3As3 via H intercalation. We show that the previously reported ethanol bath deintercalation of K2Cr3As3 to KCr3As3 has a secondary effect whereby H from the bath enters the quasi-one-dimensional Cr6As6 chains. Furthermore, we find that—contrary to previous interpretations—the difference between nonsuperconducting as-grown KCr3As3 samples and superconducting hydrothermally annealed samples is not a change in crystallinity but due to charge doping, with the latter treatment increasing the H concentration in the CrAs tubes, effectively electron doping the 133 compound. These results suggest another stoichiometry KHxCr3As3, that superconductivity arises from a suppressed magnetic order via a tunable parameter and paves the way for a charge-doped phase diagram in these materials.
