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• W2783143090 abstract "We report measurements of electron transport phenomena in the intrinsic ferromagnetic semiconductor GdN doped with $1.3ifmmodetimeselsetexttimesfi{}{10}^{21}phantom{rule{4pt}{0ex}}{mathrm{cm}}^{ensuremath{-}3}$ electrons. The conductivity, carrier concentration, and thermoelectric power are compared with expectations based on an LSDA+$U$ band structure. In the ferromagnetic state the carriers fill the majority-spin conduction band pockets to the bottom of the minority-spin band. The resistance implies an electron mobility of 18 ${mathrm{cm}}^{2}phantom{rule{0.16em}{0ex}}{mathrm{V}}^{ensuremath{-}1}phantom{rule{0.16em}{0ex}}{mathrm{s}}^{ensuremath{-}1}$ at zero temperature, and in turn a mean-free path of 10--30 nm. Spin disorder scattering rapidly reduces the mobility near the 70 K Curie temperature (${T}_{text{C}}$). The thermoelectric power is negative in the paramagnetic phase, as expected for a $n$-type conductor, with a magnitude that is in agreement with the Fermi energy implied by the band structure. The thermopower reverses sign to be positive in the ferromagnetic phase, which correlates with a strongly temperature-dependent electron diffusion from spin-disorder scattering that increases rapidly as the temperature rises toward ${T}_{text{C}}$." @default.
• W2783143090 created "2018-01-26" @default.
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• W2783143090 date "2018-01-11" @default.
• W2783143090 modified "2023-10-18" @default.
• W2783143090 title "Electron transport in heavily doped GdN" @default.
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• W2783143090 doi "https://doi.org/10.1103/physrevmaterials.2.014405" @default.
• W2783143090 hasPublicationYear "2018" @default.
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