The behaviour of the elastic constants at the transformation between the modulated phases in Ni<sub>2</sub>MnGa

Chernenko, V.A.; Кокорин, В. В.; Васильев, А. Н.; Savchenko, Yu. I.

doi:10.1080/01411599308207818

Cited by 6 publications

(2 citation statements)

References 2 publications

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“…Refs. [20][21][22][23] ), the formation of modulated phases is associated with an anomalous transverse acoustic TA 2 mode in the [110] direction at the wave vector q = 2π a [ξξ0] with ξ ≈ 0.33 and, consequently, a softening of shear modulus C . Thus, the parent cubic phase becomes unstable because the atomic planes can shuffle along the [110] direction and the premartensitic phase transition occurs at T P ≈ 260 K 24,25 .…”

Section: Introductionmentioning

confidence: 99%

Electronic structure beyond the generalized gradient approximation for Ni2MnGa

et al. 2020

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The stability of the nonmodulated martensitic phase, the austenitic Fermi surface and the phonon dispersion relations for ferromagnetic Ni2MnGa 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.

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Section: Introductionmentioning

confidence: 99%

Electronic structure beyond the generalized gradient approximation for Ni2MnGa

et al. 2020

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“…In the past few years, Heusler alloys have been investigated intensively both experimentally and theoretically, mainly due to their interesting properties such as half-metallicity and magnetic field-induced shape memory effect [1][2][3][4][5][6][7][8][9][10][11][12][13]. The half-metallic Heusler alloys are promising for applications in spintronic devices.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties and temperature-dependent half-metallicity of Co₂Mn(Ga_1−xZ_x) (Z=Si, Ge, Sn) from first-principles calculation

Luo

et al. 2013

J. Phys.: Condens. Matter

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Using the first-principles exact muffin-tin orbitals method in combination with the coherent potential approximation, we investigated the magnetic properties, exchange interactions, and temperature-dependent half-metallicity of the Co2Mn(Ga1-xZx) (Z=Si, Ge, Sn) alloys. The total magnetic moment follows perfectly a previously proposed Slater-Pauling relation, i.e., μ0 = Nt - 24, with Nt being the number of valence electrons. The Co-Mn and Co1-Co2 (inter-sublattice) interactions are dominated by direct exchange, whereas the Co1-Co1 (intra-sublattice) interaction is characterized by superexchange. The Mn-Mn exchange interaction in Co2MnGa is of long-ranged RKKY-type. However, the Mn-Mn exchange interactions in Co2MnZ are relatively localized and can be attributed to superexchange. The Co-Mn, Co1-Co2 and Co1-Co1 total exchange interactions increase with x, whereas the Mn-Mn total exchange interactions show convex behavior. The calculated Curie temperature (TC) increases with x. The ability of Z to enhance TC follows the sequence of Si > Ge > Sn, in agreement with the experimental findings. The temperature dependence of the spin polarization at the Fermi level [P(T)] is investigated based on the disordered local moment model. P(T) drops abruptly at temperatures much lower than TC. At temperatures higher than 200 K, the composition with higher TC generally corresponds to larger P(T).

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Temperature dependence of transformation strain and magnetic-field-induced strain in Ni51Mn24Ga25 single crystal

Liang

Jiang

2005

Materials Science and Engineering: A

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The behaviour of the elastic constants at the transformation between the modulated phases in Ni₂MnGa

Cited by 6 publications

References 2 publications

Electronic structure beyond the generalized gradient approximation for Ni2MnGa

Electronic structure beyond the generalized gradient approximation for Ni2MnGa

Magnetic properties and temperature-dependent half-metallicity of Co₂Mn(Ga_1−xZ_x) (Z=Si, Ge, Sn) from first-principles calculation

Temperature dependence of transformation strain and magnetic-field-induced strain in Ni51Mn24Ga25 single crystal

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The behaviour of the elastic constants at the transformation between the modulated phases in Ni2MnGa

Cited by 6 publications

References 2 publications

Electronic structure beyond the generalized gradient approximation for Ni2MnGa

Electronic structure beyond the generalized gradient approximation for Ni2MnGa

Magnetic properties and temperature-dependent half-metallicity of Co2Mn(Ga1−xZx) (Z=Si, Ge, Sn) from first-principles calculation

Temperature dependence of transformation strain and magnetic-field-induced strain in Ni51Mn24Ga25 single crystal

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The behaviour of the elastic constants at the transformation between the modulated phases in Ni₂MnGa

Magnetic properties and temperature-dependent half-metallicity of Co₂Mn(Ga_1−xZ_x) (Z=Si, Ge, Sn) from first-principles calculation