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000062272 084__ $$2WoS$$aPhysics, Multidisciplinary
000062272 1001_ $$0P:(DE-HGF)0$$aPicozzi, S.$$b0
000062272 245__ $$aAb-initio study of exchange constants and electronic structure in diluted magnetic group-IV  semiconductors
000062272 260__ $$a[Bad Honnef]$$bDt. Physikalische Ges.$$c2008
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000062272 520__ $$aExchange-constants have been evaluated from first-principles in Mn-doped Ge, mainly focusing on the effects of the impurity concentration and of the arrangement of Mn-atoms in the semiconducting matrix. As expected, the Mn-concentration strongly affects the magnitude of the exchange constants (especially between Mn as first-nearest-neighbors (NNs) in the cation position). Interestingly, the arrangement of Mn atoms is found to be relevant for the behavior of the second-NN exchange-constant along the [110]-bonding direction, which shows either a strongly ferromagnetic or a marked antiferromagnetic behavior, depending on whether the interaction is mediated by a Ge or by an Mn atom, respectively. This suggests that, at least for rather high values of the doping concentration (similar to 10%), a detailed knowledge of the Mn positions in the host is required for a careful prediction of the exchange constants and, therefore, of the ordering Curie temperature in Mn-doped Ge. The analysis of the impurity-and host-induced effects on the exchange constants is carried out by comparing (i) Mn- and Cr-doped Ge and (ii) Mn-doped Ge and GaAs. Our findings regarding the global weak antiferromagnetism for CrGe confirm that ferromagnetism in diluted magnetic semiconductors requires the presence of holes, whereas Ge and GaAs appear rather similar as for the exchange constants, both showing strong environmental effects.
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000062272 7001_ $$0P:(DE-Juel1)VDB37180$$aLezaic, M.$$b1$$uFZJ
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000062272 8567_ $$uhttp://dx.doi.org/10.1088/1367-2630/10/5/055017
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000062272 9201_ $$0I:(DE-Juel1)VDB781$$d31.12.2010$$gIFF$$kIFF-1$$lQuanten-Theorie der Materialien$$x0
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