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Thermal expansion and anisotropic pressure derivatives of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>T</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:mrow></mml:math>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>…
Heat capacity and anisotropic thermal expansion were measured for $\text{Ba}{({\text{Fe}}_{1\ensuremath{-}x}{\text{Co}}_{x})}_{2}{\text{As}}_{2}$ $(x=0,0.038,0.074)$ single crystals. Thermal expansion is anisotropic and, in tetragonal phase, is significantly higher along the $c$ axis. Previously reported phase transitions, including possibly split structural and magnetic for $x=0.038$, are clearly seen in both measurements. Uniaxial pressure derivatives of …