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

Abstract

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.

References in corpus (5)

• Combined experimental and theoretical investigation of the premartensitic transition in Ni${}_2$MnGa
• Analysis of over-magnetization of elemental transition metal solids from the SCAN Density Functional
• Ab initio prediction of stable nanotwin double layers and 4O structure in Ni${}_2$MnGa
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