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Superfluid density and field-induced magnetism in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mtext>Ba</mml:mtext><mml:msub><mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mtext>Fe</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Co</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub></mml:mrow><mml:mo>)</mml:mo></mml:mrow></mml:mrow><mml:…
We report muon spin rotation $(\ensuremath{\mu}\text{SR})$ measurements of single-crystal $\text{Ba}{({\text{Fe}}_{1\ensuremath{-}x}{\text{Co}}_{x})}_{2}{\text{As}}_{2}$ and $\text{Sr}{({\text{Fe}}_{1\ensuremath{-}x}{\text{Co}}_{x})}_{2}{\text{As}}_{2}$. From measurements of the magnetic field penetration depth $\ensuremath{\lambda}$ we find that for optimally and overdoped samples, $1/\ensuremath{\lambda}{(T\ensuremath{\rightarrow}0)}^{2}$ varies monotonically with the superconducting transition temperature ${T}_{C}$. Within the superconducting state we observe a positive shift in the muon …