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We report a sudden reversal in the pressure dependence of Tc in theiron-based superconductor CsFe2As2, similar to that discovered recently inKFe2As2 [Tafti et al., Nat. Phys. 9, 349 (2013)]. As in KFe2As2, we observe nochange in the Hall coefficient at the zero temperature limit, again ruling outa Lifshitz transition across the critical pressure Pc. We interpret the Tcreversal in the two materials as a phase transition from one pairing state toanother, tuned by pressure, and investigate what parameters control thistransition. Comparing samples of different residual resistivity, we find that a6-fold increase in impurity scattering does not shift Pc. From a study of X-raydiffraction on KFe2As2 under pressure, we report the pressure dependence oflattice constants and As-Fe-As bond angle. The pressure dependence of theselattice parameters suggests that Pc should be significantly higher in CsFe2As2than in KFe2As2, but we find on the contrary that Pc is lower in CsFe2As2.Resistivity measurements under pressure reveal a change of regime across Pc,suggesting a possible link between inelastic scattering and pairing symmetry.

physical review. b, condensed matter and materials physics

Sudden reversal in the pressure dependence of Tc in the iron-based  superconductor CsFe2As2: A possible link between inelastic scattering and  pairing symmetry