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Density functional theory study of phase stability, vibrational, and electronic properties of M03AI2C

机译:M03AI2C的相稳定性,振动和电子性质的密度泛函理论研究

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摘要

Based on density functional theory the noncentrosymmetric superconductor Mo_3Al_2C in its well-established β-Mn-type (P4_132) crystal structure is investigated. In particular, its thermodynamical and dynamical stabilities are studied by calculating lattice vibrations within the harmonic approximation. It is found that the fully stoichiometric compound is dynamically unstable. However, compounds with carbon vacancies (i.e., Mo_3Al_2C_(1-x)) can be dynamically stabilized for vacancy concentrations x > 0.09. By means of a simple thermodynamical model we estimate x ~ 0.13-0.14 for Mo_3Al_2C_(1-x) at the experimental preparation temperatures. The influence of the carbon vacancy concentration on the electronic structure is investigated.
机译:基于密度泛函理论,研究了非中心对称的超导体Mo_3Al_2C在其良好建立的β-Mn型(P4_132)晶体结构中。特别是,通过计算谐波近似内的晶格振动来研究其热力学和动力学稳定性。发现完全化学计量的化合物是动态不稳定的。但是,对于空位浓度x> 0.09,可以动态稳定具有碳空位的化合物(即Mo_3Al_2C_(1-x))。通过简单的热力学模型,我们估计在实验制备温度下Mo_3Al_2C_(1-x)的x〜0.13-0.14。研究了碳空位浓度对电子结构的影响。

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