Magnetoresistance origin in martensitic and austenitic phases of Ni_2Mn_(1+x)Sn_(1-x)

摘要

The magnetoresistance (MR) of Ni_2Mn_(1+x).Sn_(1-x) (0.40≤x≤0.52) is studied as functions of temperature and magnetic field in austenitic and martensitic phases. The maximum MR obtained is -36% (x=0.4) at 170 K with 7 T magnetic field during martensitic transition. The MR in the martensitic phase (maximum -2.2%) is less than that in austenitic phase (maximum -4.6%). The origin of less MR below and above martensitic transition is understood through the experimental data fitting with magnetic field dependence (H~n) of MR.