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Jump in specific heat at the superconducting transition temperature 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:…
We present detailed heat capacity measurements for $\text{Ba}{({\text{Fe}}_{1\ensuremath{-}x}{\text{Co}}_{x})}_{2}{\text{As}}_{2}$ and $\text{Ba}{({\text{Fe}}_{1\ensuremath{-}x}{\text{Ni}}_{x})}_{2}{\text{As}}_{2}$ single crystals in the vicinity of the superconducting transitions. The specific-heat jump at the superconducting transition temperature $({T}_{c})$, $\ensuremath{\Delta}{C}_{p}/{T}_{c}$, changes by a factor of $\ensuremath{\sim}10$ across these series. The $\ensuremath{\Delta}{C}_{p}/{T}_{c}$ vs ${T}_{c}$ data of this work [together with the literature …