Magnetic and Transport Properties of Heusler Compound ${\rm Co}_{2}{\rm TiAl}$

The magnetic properties of the polycrystalline Heusler compound Co
₂
TiAl were investigated by the classical experimental methods and the magnetic Compton scattering experiment. The X-ray diffraction profile at room temperature can be identified as the phase of the L2
₁
-type ordered structure. The magnetic field and temperature dependence of magnetization show that Co
₂
TiAl has the typical soft ferromagnetic properties with T
_C
of 120 K and the saturation magnetization of 0.70 μ
_B
per formula unit. The resistivity shows a typical metallic behavior at temperatures up to 300 K. The magnetoresistance (MR) effect with the MR ratio of - 8% appears in the vicinity of T
_C
. The characteristics of the magnetic Compton profile are similar to that of the well-known ferromagnetic metals such as Ni and Fe. The experimental results indicate that the origin of the MR effect observed for Co
₂
TiAl is similar to that for conventional ferromagnetic materials.