First-principles calculations of the electronic, vibrational, and elastic properties of the magnetic laminate Mn2GaC

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作者：
20151100639083
机构：
[1] Thore, A.
[2] Dahlqvist, M.
[3] Alling, B.
[4] Rosén, J.
来源：
Thore, A. (andth@ifm.liu.se) | 1600年 / American Institute of Physics Inc.卷 / 116期
关键词：
In this paper; we report the by first-principles predicted properties of the recently discovered magnetic MAX phase Mn2GaC. The electronic band structure and vibrational dispersion relation; as well as the electronic and vibrational density of states; have been calculated. The band structure close to the Fermi level indicates anisotropy with respect to electrical conductivity; while the distribution of the electronic and vibrational states for both Mn and Ga depend on the chosen relative orientation of the Mn spins across the Ga sheets in the Mn-Ga-Mn trilayers. In addition; the elastic properties have been calculated; and from the five elastic constants; the Voigt bulk modulus is determined to be 157 GPa; the Voigt shear modulus 93 GPa; and the Young's modulus 233 GPa. Furthermore; Mn2GaC is found relatively elastically isotropic; with a compression anisotropy factor of 0.97; and shear anisotropy factors of 0.9 and 1; respectively. The Poisson's ratio is 0.25. Evaluated elastic properties are compared to theoretical and experimental results for M2AC phases where M = Ti; V; Cr; Zr; Nb; Ta; and A = Al; S; Ge; In; Sn. © 2014 AIP Publishing LLC;
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