Variation of electrical resistance in single-crystalline Ni50 Mn50-x Inx alloys (x=14-16) upon martensitic transformation was investigated. In Ni50 Mn35 In15 with Tm ∼295 K, a negative magnetoresistance (MR) over 60% is attainable at moderate field strengths; in Ni50 Mn34 In16 with Tm ∼190 K, the MR can exceed 70% over a temperature of approximately 100 K. The significant change in electric resistance upon martensitic transformation originates primarily from the altered electronic structure, while the large effect of a magnetic field follows its ability to manipulate the transformation in materials of low Tm and large ΔMΔS. The extremely large MR promises more innovative applications for these important alloys.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)