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Quasiparticle heat transport in single-crystalline<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Ba</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:mtext>K</mml:mtext><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mtext>Fe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>As</mml:mtext></mml:mrow><mml:mn>2</mml:mn…
The thermal conductivity $\ensuremath{\kappa}$ of the iron-arsenide superconductor ${\text{Ba}}_{1\ensuremath{-}x}{\text{K}}_{x}{\text{Fe}}_{2}{\text{As}}_{2}({T}_{c}\ensuremath{\simeq}30\text{ }\text{K})$ was measured in single crystals at temperatures down to $T\ensuremath{\simeq}50\text{ }\text{mK}(\ensuremath{\simeq}{T}_{c}/600)$ and in magnetic fields up to $H=15\text{ }\text{T}(\ensuremath{\simeq}{H}_{c2}/4)$. A negligible residual linear term in $\ensuremath{\kappa}/T$ as $T\ensuremath{\rightarrow}0$ shows that there are no zero-energy quasiparticles in the superconducting state. This …