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Spin and lattice structures of single-crystalline<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>
We use neutron scattering to study the spin and lattice structure of single-crystal ${\text{SrFe}}_{2}{\text{As}}_{2}$, the parent compound of the FeAs-based superconductor $(\text{Sr},\text{K}){\text{Fe}}_{2}{\text{As}}_{2}$. We find that ${\text{SrFe}}_{2}{\text{As}}_{2}$ exhibits an abrupt structural phase transition at 220 K, where the structure changes from tetragonal with lattice parameters $c>a=b$ to orthorhombic with $c>a>b$. At …