Tight binding approximation and magnetic susceptibility
  The density of states and chemical potential as functions of temperature and filling degree of energy band were calculated. It was shown the peculiarity of concentration and temperature behavior of chemical potential is stipulated by Fermi statistics in the system with bounded energy spectrum. The magnetic initial susceptibility temperature trend was calculated for the half filled energy band. The sharp susceptibility maximum was obtained at low temperature and the susceptibility approaching to null value at absolute zero temperature was shown. Such behavior is discussed in the connection with the experimental results for lithium and potassium metals. 
B.V. Karpenko, A.V. Kuznetsov, A.A. Bogolubova
cond-mat.mtrl-sci