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- W2056770147 abstract "The introduction of magnetic moments such as Gd into amorphous Si produces dramatic effects in electrical transport below a characteristic temperature ${T}^{*}$. Below ${T}^{*}$, the conductivity of the magnetically doped systems is strongly suppressed compared to equivalent nonmagnetic Y doped samples, and displays enormous negative magnetoresistance. ${T}^{*}$ occurs at relatively high temperatures $(ensuremath{sim}10--100phantom{rule{0.3em}{0ex}}mathrm{K})$ and decreases sharply with increasing Gd concentration, passing smoothly through the metal-insulator transition. In ternary samples with both Gd and nonmagnetic Y, ${T}^{*}$ decreases strongly with increasing metallization, whether due to the addition of Gd alone or a mixture of Gd and Y. These results cannot be explained by simple magnetic interaction models, suggest the crucial role of electron screening and are reminiscent of mass enhancement behavior." @default.
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- W2056770147 date "2005-03-22" @default.
- W2056770147 modified "2023-10-18" @default.
- W2056770147 title "Characteristic temperature in magnetically doped amorphous semiconductors" @default.
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- W2056770147 doi "https://doi.org/10.1103/physrevb.71.113203" @default.
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