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- W2069897588 abstract "Temperature-dependent Hall-effect measurements on two Cr-doped GaAs samples show a dominant center at ${E}_{1}=0.324ensuremath{-}1.4ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}4}T$ eV, with respect to the valence-band edge. By comparison with secondary-ion mass spectroscopy measurements of the Cr concentration, and recent EPR measurements of the ${mathrm{Cr}}^{2+}$, ${mathrm{Cr}}^{3+}$, and ${mathrm{Cr}}^{4+}$ concentration in several samples, it is shown unambiguously that this energy describes the ${mathrm{Cr}}^{4+}$ ensuremath{rightarrow} ${mathrm{Cr}}^{3+}$ transition. This is the first conclusive evidence for a charge-state transition involving ${mathrm{Cr}}^{4+}$ in GaAs." @default.
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- W2069897588 date "1982-12-06" @default.
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- W2069897588 title "Positive Identification of the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=normal>Cr</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>→<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=normal>Cr</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup…" @default.
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- W2069897588 doi "https://doi.org/10.1103/physrevlett.49.1728" @default.
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