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Superconducting and Ferromagnetic Phases Induced by Lattice Distortions in Stoichiometric<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>SrFe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>Single Crystals
Single crystals of ${\mathrm{SrFe}}_{2}{\mathrm{As}}_{2}$ grown using a self-flux solution method were characterized via x-ray, transport, and magnetization studies, revealing a superconducting phase below ${T}_{c}=21\text{ }\text{ }\mathrm{K}$ characterized by a full electrical resistivity transition and partial diamagnetic screening. The reversible destruction and reinstatement of this phase by heat treatment and mechanical …