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Structural and electronic characterization of (Ca0.67Sr0.33)Fe2As2 has beenperformed as a func- tion of pressure up to 12 GPa using conventional anddesigner diamond anvil cells. The compound (Ca0.67Sr0.33)Fe2As2 behavesintermediate between its end members-CaFe2As2 and SrFe2As2- displaying asuppression of magnetism and the onset of superconductivity. Like other membersof the AEFe2As2 family, (Ca0.67Sr0.33)Fe2As2 undergoes a pressure-inducedisostructural volume collapse, which we associate with the development of As-Asbonding across the mirror plane of the structure. This collapsed tetragonalphase abruptly cuts off the magnetic state, giving rise to superconductivitywith a maximum Tc=22.2 K. The maximum Tc of the superconducting phase is notstrongly correlated with any structural parameter, but its proximity to theabrupt suppression of magnetism as well as the volume collapse transitionsuggests that magnetic interactions and structural inhomogeneity may play arole in its development. The pressure-dependent evolution of the ordered statesand crystal structures in (Ca,Sr)Fe2As2 provides an avenue to understand thegeneric behavior of the other members of the AEFe2As2 family.

The suppression of magnetism and the development of superconductivity within the collapsed tetragonal phase of Ca0.67Sr0.33Fe2As2 at high pressure