The effect of Ni-doping on the magnetic and electronic properties of cubic half heusler Cu1-xNixMnSb (x = 0.04, 0.07, 0.1, 0.125) compounds have been investigated both experimentally and theoretically in light of the development of half-metallic ferromagnetism (HMFM) in x = 1, NiMnSb. Our findings reveal that Ni-substitution introduces ferromagnetic (FM) correlations within the parent AFM matrix of CuMnSb. This is followed by the reduction in spin-down density of states (DOS) at the Fermi energy (EF), verified from the gradual suppression of T2-dependency in the low T resistivity variation upon increasing doping content. The ab-initio electronic structure calculations further suggest that the Sb p-holes, produced upon Ni doping, mediate the RKKY-type indirect FM exchange between the distant Mn atoms, and consequently, the spin-down DOS starts to get depleted at the Fermi energy. Further the importance of the Sb p-holes in mediating ferromagnetic (FM) exchange interaction, is illustrated theoretically on Fe-doped Cu1-x FexMnSb systems having identical crystal structure, where appreciable Sb holes stabilizes FM correlations at much lower concentration of Fe.
Bandyopadhyay, A., Neogi, S.K., Paul, A., Meneghini, C., Dasgupta, I., Ray, S. (2018). Effect of Ni doping on the magnetic and electronic properties of half heusler Cu1-xNixMnSb alloys. JOURNAL OF ALLOYS AND COMPOUNDS, 764, 656-664 [10.1016/j.jallcom.2018.06.065].
Effect of Ni doping on the magnetic and electronic properties of half heusler Cu1-xNixMnSb alloys
Meneghini, C.;
2018-01-01
Abstract
The effect of Ni-doping on the magnetic and electronic properties of cubic half heusler Cu1-xNixMnSb (x = 0.04, 0.07, 0.1, 0.125) compounds have been investigated both experimentally and theoretically in light of the development of half-metallic ferromagnetism (HMFM) in x = 1, NiMnSb. Our findings reveal that Ni-substitution introduces ferromagnetic (FM) correlations within the parent AFM matrix of CuMnSb. This is followed by the reduction in spin-down density of states (DOS) at the Fermi energy (EF), verified from the gradual suppression of T2-dependency in the low T resistivity variation upon increasing doping content. The ab-initio electronic structure calculations further suggest that the Sb p-holes, produced upon Ni doping, mediate the RKKY-type indirect FM exchange between the distant Mn atoms, and consequently, the spin-down DOS starts to get depleted at the Fermi energy. Further the importance of the Sb p-holes in mediating ferromagnetic (FM) exchange interaction, is illustrated theoretically on Fe-doped Cu1-x FexMnSb systems having identical crystal structure, where appreciable Sb holes stabilizes FM correlations at much lower concentration of Fe.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.