Giant Hall effect in Ni-Mn-In Heusler alloys

We present experimental results on the giant Hall effect in the Heusler alloy Ni₅₀Mn_50-xInₓ with $x=15.2$. An unusual field dependence of the Hall resistivity (ρH) was observed in the vicinity of the martensitic phase transition, where ρH sharply increases up to ρH (15 kOe)=50 μΩ cm. This value is comparable with the giant Hall resistivity in magnetic nanogranular alloys. Associated with ρH, the Hall angle reaches a giant value of tan^-1 0.5. An explanation of the giant Hall effect in Ni₅₀Mn_50-xInₓ Heusler alloys has been suggested.