Effect of cobalt doping on thermoelastic martensitic transformations and physical properties of magnetic shape memory alloys Ni$_{50-x}$Co$_x$Mn$_{29}$Ga$_{21}$

The magnetic and thermoelastic martensitic transformations and physical properties (magnetization, electrical resistivity, thermoelectric power, relative elongation, and thermal expansion coefficient) of multicomponent magnetic shape memory alloys Ni$_{50-x}$Co$_x$Mn$_{29}$Ga$_{21}$ ($x$ = 0, 1, 2, 3, 10 at%) have been investigated. The critical temperatures of thermoelastic martensitic transformation and magnetic transitions have been determined. It has been found that the alloy with 10 at% Co undergoes a martensitic transformation in the temperature range of 6–10 K.