Self-compensation in manganese-doped ferromagnetic semiconductors |
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Authors: | Erwin Steven C Petukhov A G |
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Affiliation: | Center for Computational Materials Science, Naval Research Laboratory, Washington, DC 20375, USA. |
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Abstract: | We present a theory of interstitial Mn in Mn-doped ferromagnetic semiconductors. Using density-functional theory, we show that under the nonequilibrium conditions of growth, interstitial Mn is easily formed near the surface by a simple low-energy adsorption pathway. In GaAs, isolated interstitial Mn is an electron donor, each compensating two substitutional Mn acceptors. Within an impurity-band model, partial compensation promotes ferromagnetic order below the metal-insulator transition, with the highest Curie temperature occurring for 0.5 holes per substitutional Mn. |
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