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• W1981844745 abstract "A possible mechanism for high-temperature ferromagnetic order in Si:Mn alloys is proposed. These materials, which are semiconducting or metallic, depending on the Mn content, are suggested to undergo phase separation. In the phase-separated state, again depending on the Mn content, Mn atoms can be gathered within nanometer-sized particles or micrometer-sized islands composed of the MnSi${}_{2ensuremath{-}z}$ precipitate with $zensuremath{approx}(0.25--0.30)$, which are embedded in the Mn-poor silicon matrix. We consider the MnSi${}_{2ensuremath{-}z}$ precipitate to be the MnSi${}_{1.7}$ silicide host containing a certain amount of magnetic defects associated with unbound Mn 3d orbitals. The MnSi${}_{1.7}$ silicide is considered to be a weak itinerant ferromagnet, where sizable spin fluctuations (paramagnons) exist far above its intrinsic Curie temperature, leading to a strong enhancement of the exchange coupling between the local moments of the defects. As a result, a significant enhancement of the temperature of onset of long-range order among the local moments may be achieved. We associate this temperature with the global Curie temperature of the precipitate. A phenomenological model is developed to determine the spatial structures and characteristics of ferromagnetic order for the cases of a bulk precipitate and of precipitate particles of various shapes. Moreover, allowing for the presence of strong quenched disorder in the precipitate, we describe short-range ferromagnetic order in the system. Experimental data on Si:Mn alloys are interpreted on the basis of our theoretical results." @default.
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• W1981844745 date "2011-01-05" @default.
• W1981844745 modified "2023-10-17" @default.
• W1981844745 title "High-temperature ferromagnetism in Si:Mn alloys" @default.
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• W1981844745 doi "https://doi.org/10.1103/physrevb.83.035201" @default.
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