Abstract
The temperature dependent resistivity behavior of Ni2Mn1+xIn1−x (0.32 ≤x≤ 0.48), Ni1.81Co0.22Mn1.46In0.51 and Ni1.81Co0.22Mn1.45In0.52 is studied with and without applied magnetic field. These alloys exhibit inverse magnetocaloric effect and giant magnetoresistance that are important for applications like magnetic refrigeration and magnetic sensors. The properties arise due to shift in martensitic transition to lower temperature with applied magnetic field. The doping of Co at Ni site and Mn at In site affects the disorder in the system. The disorder is an important factor that decides the requirement of magnetic field for applicability. In present manuscript, the effect of disorder is studied through resistivity behaviour. The resistivity upturn is observed at low temperature. The upturn is fitted by least square method. The fitting reveals nature of disorder, origin of low temperature resistivity behavior with magnetic field, and consequently reveals the cause of difference in magnetic field induced large shift in martensitic transition to lower temperature with composition. The results reveal that long-range antiferromagnetic coupling and balance of Co and Mn doping amount is desired in new material design for technical applications.
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