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arXiv 2008.02553cond-mat.mtrl-sci
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Ni $_2$ MnGa的电子结构

Electronic structure beyond the generalized gradient approximation for Ni$_2$MnGa

D. R. Baigutlin, V. V. Sokolovskiy, O. N. Miroshkina, M. A. Zagrebin, J. Nokelainen, A. Pulkkinen, B. Barbiellini, K. Pussi, E. Lähderanta, V. D. Buchelnikov, A. T. Zayak

摘要:

用密度泛函理论研究了铁磁Ni $_2$ MnGa非调制马氏体相的稳定性、奥氏体费米面和声子色散关系.交换相关效应被认为具有不同程度的精度,从最简单的本地自旋密度近似(LSDA),然后添加校正内的广义梯度近似(GGA),最后,包括元GGA校正内的强约束和适当规范(SCAN)。我们讨论了一个简单的程序,以减少可能高估的磁化和低估的嵌套矢量在扫描参数减少自相互作用的修正。

英文摘要:

The stability of the nonmodulated martensitic phase, the austenitic Fermi surface and the phonon dispersion relations for ferromagnetic Ni$_2$MnGa are studied using density functional theory. Exchange-correlation effects are considered with various degrees of precision, starting from the simplest local spin density approximation (LSDA), then adding corrections within the generalized gradient approximation (GGA) and finally, including the meta-GGA corrections within the strongly constrained and appropriately normed (SCAN). We discuss a simple procedure to reduce a possible overestimation of magnetization and underestimation of nesting vector in SCAN by parametrically decreasing self-interaction corrections.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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