Role of covalent hybridization in martensitic structure and magnetic properties of shape memory alloys: the case of Ni50Mn5+xGa35-xCu10

Abstract

We have investigated the impact of covalent hybridization on martensitic structure and magnetic properties of Ni50Mn5+xGa35-xCu10 shape memory alloys. We found that the lattice distortion ((c-a)/a) of L10 martensite monotonously changes with the substitution of Mn for Ga atoms and shows a kink behavior at Ga(at.%)= 25 due to the weakened covalent effect between main-group and transition-metal atoms. Moreover, owing to the competition between covalence hybridization and magnetic ordering of introduced Mn atoms, the molecular magnetic moment and Curie temperature coincidently show maximums at Ga(at.%)=25 as well. These behaviors are closely associated with corresponding changes of the strength of covalent hybridization. The results therefore suggest that careful control of the concentration of main-group atoms in Heusler alloys can serve as an additional general tuning parameter for searching new multifunctional materials.

22 pages, 4 figures and 1 table, supplementary info, submitted for publication

References in corpus (4)

• Local Atomic Structure of Martensitic Ni${}_{2+x}$Mn${}_{1-x}$Ga: An EXAFS Study
• Factors influencing the Martensitic interactions in Ni50Mn35Sn15: An EXAFS study
• Role of covalent hybridization in martensitic structure and magnetic properties of shape memory alloys: the case of Ni50Mn5+xGa35-xCu10
• Local atomic arrangement and martensitic transformation in Ni${}_{50}$Mn${}_{35}$In${}_{15}$: An EXAFS Study

Cited by in corpus (3)

• Role of covalent hybridization in martensitic structure and magnetic properties of shape memory alloys: the case of Ni50Mn5+xGa35-xCu10
• Giant Magnetic-Field-Induced Strain in Ni2MnGa-based polycrystal
• Structure, magnetism and magnetic compensation behavior of Co50-xMn25Ga25+x and Co50-xMn25+xGa25 Heusler alloys