Thermoelectric and topological properties of half-Heusler compounds ZrIrX(As,Sb, Bi) |
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Authors: | Minping Zhang Junhong Wei Guangtao Wang |
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Institution: | 1. College of Physics and Information Engineering, Henan Normal University, Xinxiang, Henan 453007, China;2. School of Mechanical and Electrical Engineering, Henan Institute of Science and Technology, Xinxiang, Henan 453003, China |
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Abstract: | The strain dependent electronic structures, thermoelectric and topological properties of the half-Heusler compounds ZrIrX(X=As, Sb, Bi) are investigated by the first-principle calculations. At the equilibrium lattice constants, all the three compounds are trivial insulators and good thermoelectric materials with the Seebeck coefficient S and the power factor over relaxation time as large as 1180 (μV/K) and 4.1 (), respectively. The compressive strain enhances the band gap, while the tensile strain decreases the band gap. At some specific tensile strains, the compounds become Dirac-semimetals, with the s-type band below p-type band , in the cubic phase. When we compress the a(b)-axis and elongate the c-axis of the compounds, they become the type-I Weyl semimetals. For ZrIrAs, the eight Weyl-Points (WPS) locate at (± Kx, 0, ± Kz), (0, ± Ky, ± Kz), , . |
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Keywords: | Thermoelectric Topological Half-Heusler Weyl semimetals |
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