Disorder induced resistivity anomaly in Ni₂Mn_1+xSn_1-x

Highlights: • Model with phonon, magnetic disorder, localized states with e–e interaction for ρ. • Phonon scattering change with structural phase fraction of compositions. • The strong coupling between spin and lattice is manifested. • The short range antiferromagnetic ordering due to magnetic disorder. • Pseudogap formation due to co-existence of extended and localized states. - Abstract: The electrical resistivity behavior of disordered 3d transition metal alloy Ni₂Mn_1+xSn_1-x is studied as a function of temperature, magnetic field and concentration (0.40⩽x⩽0.52). A model assuming electron-phonon scattering, magnetic disorder, and localized states with electron-electron interaction is applied to understand the resistivity behavior in the martensitic phase. The electron-phonon scattering changes with structural phase fraction change as a function of composition. The strong coupling between spin and lattice is also manifested. The short range antiferromagnetic ordering by magnetic disorder and pseudogap formation due to co-existence of extended and localized states is predicted. In the austenitic phase, the magnetic disorder has T² dependence with magneto-elastic coupling