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The effects of pressure up to $\sim 20$ kbar, on the structural phasetransition of SrFe$_2$As$_2$ and lightly Sn-doped BaFe$_2$As$_2$, as well as onthe superconducting transition temperature and upper critical field of(Ba$_{0.55}$K$_{0.45}$)Fe$_2$As$_2$ single crystals have been studied. All thetransition temperatures decrease with pressure in an almost linear fashion.Under pressure, the upper critical field curve, $H_{c2}(T)$, for(Ba$_{0.55}$K$_{0.45}$)Fe$_2$As$_2$ shifts down in temperature to follow thezero field $T_c$ with very little change in slope. Composite $P - T$ phasediagrams for three parent compounds, AFe$_2$As$_2$ (A = Ba, Sr, Ca), areconstructed and appear to be remarkably similar: (i) having a structural(antiferromagnetic) phase transition line with a negative slope and (ii)showing signs of the emerging superconducting state at intermediate pressures.

Effect of pressure on the structural phase transition and superconductivity in (B$_{1-x}K_x)Fe_2As_2 (x = 0 and 0.45) and SrFe_2As_2 single crystals