Transport properties and structural phase transition of the Heusler alloy Co2TiAl synthesized by the melt-spinning technique

Resistivity, differential scanning calorimetry (DSC) and magnetization have been measured for the Heusler alloy Co2TiAl synthesized by the melt-spinning technique to investigate transport properties and phase transitions. The resistivity follows a T2 behavior at low temperatures and linearly varies with temperature above the Curie temperature, indicating that the electron-spin wave and electron-phonon scatterings are dominant scattering mechanisms, respectively. The present measurements reveal that a structural phase transition occurs at 280 K, which is reduced by 15 K under a magnetic field of 2 T.