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Magnetic and structural transitions in layered iron arsenide systems:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>A</mml:mi><mml:msub><mml:mrow><mml:mtext>Fe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>As</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>versus<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>R</mml:mi><mml:mtext>FeAsO</mml:mtext…
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 …