Abstract
The magnetism of the ${M}_{n+1}A{X}_{n}$ phase, ${\text{Cr}}_{2}$GeC, and its Mn-doped system, (${\text{Cr}}_{1\ensuremath{-}x}$${\text{Mn}}_{x}$)${}_{2}$GeC ($x\ensuremath{\le}0.25$), synthesized via a solid state reaction, was investigated systematically. ${\text{Cr}}_{2}$GeC is in a spin-unpolarized state, but the ferromagnetic band polarization is induced immediately by the Mn doping. The Curie temperature, ${T}_{\mathrm{C}}$, and the spontaneous moment, ${p}_{\mathrm{s}}$, increase almost proportionally to the Mn concentration, strongly suggesting that ${\text{Cr}}_{2}$GeC is located in the vicinity of a ferromagnetic quantum critical point. The strong concentration dependence of ${p}_{\mathrm{eff}}/{p}_{\mathrm{s}}$, where ${p}_{\mathrm{eff}}$ is the effective moment in the paramagnetic state, indicates that the ferromagnetism appearing in the Mn-doped ${\text{Cr}}_{2}$GeC can be classified as a typical itinerant-electron ferromagnetism in a wide range of the degree of electron localization.
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