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Change of magnetic ground state by light electron doping in CeOs<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>Al<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>10</mml:mn></mml:msub></mml:math>
The effect of Ir substitution for Os in CeOs${}_{2}$Al${}_{10}$, with an unusually high N\'eel temperature of ${T}^{*}\ensuremath{\sim}28.5$ K, has been studied by high-resolution neutron diffraction and magnetization measurements. A small amount of Ir ($\ensuremath{\sim}$$8%$) results in a pronounced change of the magnetic structure of the Ce sublattice. The induced magnetic …