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- W2938453497 abstract "Mn doping in $mathrm{GaN}$ results in the generation of deep acceptor levels in the band gap of $mathrm{GaN}$. In the absence of any extrinsic doping, these levels are partially occupied and result in a ferromagnetic state being stabilized. In this work we show that strongly $p$-type conditions generated by the presence of Ga vacancies can destroy the ferromagnetic state. This is because the shallow acceptor levels generated by the $p$-type conditions depopulate the Mn associated deep band gap impurity levels resulting in a reduction of the exchange splitting and, hence, destroy ferromagnetism. In addition we find a Hund's rule type of mechanism which makes the Ga vacancies favor spin polarized configurations. The exchange splittings are as large as $0.5--1phantom{rule{0.3em}{0ex}}mathrm{eV}$. As the host material is changed from $mathrm{GaN}$ to $mathrm{GaP}$ and $mathrm{GaAs}$, we find that the spin polarization of the vacancy level decreases." @default.
- W2938453497 created "2019-04-25" @default.
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- W2938453497 date "2006-04-10" @default.
- W2938453497 modified "2023-09-23" @default.
- W2938453497 title "Suitability of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>p</mml:mi></mml:mrow></mml:math>-type conditions for ferromagnetism in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>GaN</mml:mi><mml:mo>:</mml:mo><mml:mi>Mn</mml:mi></mml:mrow></mml:math>" @default.
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- W2938453497 doi "https://doi.org/10.1103/physrevb.73.153201" @default.
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