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Crossover from Kondo semiconductor to metallic antiferromagnet with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>5</mml:mn><mml:mi>d</mml:mi></mml:mrow></mml:math>-electron doping in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>CeFe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Al</mml:mi><mml:mn>10</mml:mn></mml:msub></mml:mrow></mml:math>
We report a systematic study of the $5d$-electron-doped system $\mathrm{Ce}{({\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Ir}}_{x})}_{2}{\mathrm{Al}}_{10}$ $(0\ensuremath{\le}x\ensuremath{\le}0.15)$. With increasing $x$, the orthorhombic $b$ axis decreases slightly while accompanying changes in $a$ and $c$ leave the unit cell volume almost unchanged. Inelastic neutron scattering, along with thermal and transport measurements, reveal that for the Kondo semiconductor ${\mathrm{CeFe}}_{2}{\mathrm{Al}}_{10}$, …