ELECTRONIC-STRUCTURE AND MAGNETIC-PROPERTIES OF COTI1-XALX ALLOYS

The band structure of ordered CoTi, CoAl and Co2TiAl alloys is calcula ted by the spin-polarized TB LMTO method. We do not observe a magnetic moment on the Co atom in CoTi and CoAl compounds with the CsCl type s tructure. The Co2TiAl alloy with the L2(1) type structure is ferromagn etic with a magnetic moment on the Co atom m(Co) = 0.27 mu(B) and a sm all opposite induced magnetic moment on the Ti atom m(Ti) = -0.05 mu(B ). The electronic densities of states of the disorder CoTi1-xAlx alloy s are computed by the TB LMTO CPA method. We find that the magnetic mo ment has the maximum for x = 0.5 and it decreases to zero for x = 0 an d x = 1.0. From the values of the density of states at the Fermi level we calculate the electronic specific heat coefficient gamma. The gene ral trend of gamma is close to the experimental data.