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Strong coupling between magnetic and structural order parameters in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>SrFe</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>
X-ray and muon spin-relaxation experiments performed on ${\text{SrFe}}_{2}{\text{As}}_{2}$ polycrystals confirm a sharp first-order transition at ${T}_{0}=205\text{ }\text{K}$ corresponding to an orthorhombic phase distortion and to a commensurate antiferromagnetic Fe ordering with a larger distortion and larger size of the ordered moment than reported for ${\text{BaFe}}_{2}{\text{As}}_{2}$. The structural and the magnetic …