Abstract
Resistivity, specific-heat, and magnetic-susceptibility measurements performed on ${\text{SrFe}}_{2}{\text{As}}_{2}$ samples evidence a behavior very similar to that observed in LaFeAsO and ${\text{BaFe}}_{2}{\text{As}}_{2}$, with the difference being that the formation of the spin-density wave and the lattice deformation occur in a pronounced first-order transition at ${T}_{0}=205\text{ }\text{K}$. Comparing further data evidences that the Fe magnetism is stronger in ${\text{SrFe}}_{2}{\text{As}}_{2}$ and in ${\text{EuFe}}_{2}{\text{As}}_{2}$ than in the other layered FeAs systems investigated up to now. Full potential local-density approximation band-structure calculations confirm the large similarity between the compounds, especially for the relevant low energy $\text{Fe}\text{ }3d$ states. The relation between structural details and magnetic order is analyzed.
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