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Theoretical study of alloy phase stability in zincblende Ga_(1-x)Mn_xAs

机译:闪锌矿Ga_(1-x)Mn_xAs中合金相稳定性的理论研究

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摘要

Alloy phase stability of zincblende Ga_(1-x)Mn_xAs was investigated by using the first-principles full-potential linearized augmented plane-wave method and the cluster expansion method, within the local spin density approximation (LDA), generalized gradient approximation (GGA), and LDA + U. All approximations demonstrate that the system has a tendency to segregation and inherently favors clustering. Importantly, calculated lattice constant in the LDA + U is found to increase when the substitutional Mn composition increases, which appears to support recent experiments.
机译:在局部自旋密度逼近(LDA),广义梯度逼近(GGA)范围内,采用第一性原理全势线性化增强平面波方法和簇扩展方法研究了闪锌矿Ga_(1-x)Mn_xAs的合金相稳定性。 ),以及LDA +U。所有近似值都表明该系统具有分离的趋势,并固有地有利于聚集。重要的是,发现当取代锰组成增加时,LDA + U中计算出的晶格常数会增加,这似乎支持最近的实验。

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