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Doping evolution of the absolute value of the London penetration depth and superfluid density in single crystals of<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…
The zero-temperature value of the in-plane London penetration depth, ${\ensuremath{\lambda}}_{ab}(0)$, has been measured in single crystals of $\text{Ba}{({\text{Fe}}_{1\ensuremath{-}x}{\text{Co}}_{x})}_{2}{\text{As}}_{2}$ as a function of the Co concentration, $x$, across both the underdoped and overdoped superconducting regions of the phase diagram. For $x\ensuremath{\gtrsim}0.047$, ${\ensuremath{\lambda}}_{ab}(0)$ has been found to have values between $120\ifmmode\pm\else\textpm\fi{}50$ and …