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We report high pressure powder synchrotron x-ray diffraction studies onMFe2As2 (M=Ba, Ca) over a range of temperatures and pressures up to about 56GPa using a membrane diamond anvil cell. A phase transition to a collapsedtetragonal phase is observed in both compounds upon compression. However, at300 (33) K in the Ba-compound the transition occurs at 26 (29) GPa, which is amuch higher pressure than 1.7 (0.3) GPa at 300 (40) K in the Ca-compound, dueto its larger volume. It is important to note that the transition in bothcompounds occurs when they are compressed to almost the same value of the unitcell volume and attain similar ct/at ratios. We also show that the FeAs4tetrahedra are much less compressible and more distorted in the collapsedtetragonal phase than their nearly regular shape in the ambient pressure phase.We present a detailed analysis of the pressure dependence of the structures aswell as equation of states in these important BaFe2As2 and CaFe2As2 compounds.

Synchrotron X-ray Diffraction Study of BaFe2As2 and CaFe2As2 at High Pressures up to 56 GPa: Ambient and Low-Temperatures Down to 33 K