  First principles FPLAPWcalculations were performed in the framework of
Density Functional Theory (DFT), to study the electronic structures and
magnetic properties for the new full-Heusler compounds: Sc2CoZ (Z=Si, Ge, Sn).
The investigated materials are stable against decomposition, in ferromagnetic
configuration and crystallize in the inverse Heusler structures. The
half-metallic properties as function of the variation of unit cell volumes are
analysed regarding the fourth main group constituent elements. The electronic
structure calculations for Sc2CoSi and Sc2CoSn show half-metallic characters,
with indirect band gaps of 0.544 eV and 0.408 eV at optimized lattice
parameters of 6.28 A and 6.62 A, respectively. For Sc2CoGe compound, the Fermi
energy is not pinned inside the energy band gap from minority density of
states, neither for unit cell contraction or for enlargement. The calculated
total magnetic moments are 1muB/f.u., for all compounds, in agreement with
Slater-Pauling rule.
