  Here we explore the applicability of the two current model in understanding
the transport behavior of Fe 2 CoSi compound by using the first principles
calculations in combination with the Boltzmann transport theory. The
spin-unpolarized calculation shows large density of states (DOS) at Fermi level
(E F) and is unable to provide the correct temperature dependence of transport
coefficients. The spin-polarised calculation shows reduced DOS at the E F in
the spin-up channel, whereas spin-dn channel have almost zero DOS at the E F .
The absolute value of Seebeck coefficient in the spin-up channel shows linear
increment with the temperature and in the spin-dn channel it varies
non-linearly. The electrical conductivity also shows non-linear temperature
dependence in both the spin channels whereas, the electronic thermal
conductivity shows linear temperature dependence. The values of transport
coefficients and their temperature dependence obtained by using the two current
model are found to be in fairly good agreement with the experimental data.
Present work clearly suggests the importance of two current model in
understanding the transport properties of the compound.
