Investigation of electronic and magnetic properties of antiferromagnetic GdBi system by first principle and series expansions calculations

The exchanges interactions J1(Gd-Gd) and J2(Gd-Gd) between the magnetic atoms are obtained using the mean field theory. The high temperature series expansions (HTSEs) of the magnetic susceptibility of GdBi antiferromagnetic moment (mGd) through GdBi is given up to tenth order series versus of (JGd-Gd/kBT). The Néel temperature TN is obtained by HTSEs of the magnetic susceptibility series using the Padé approximant method.