Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-69-C8-70
DOI: 10.1051/jphyscol:1988821
VARIATIONAL APPROACH TO FINITE-TEMPERATURE MAGNETISM IN THE DEGENERATE NARROW BANDS
Y. KakehashiDepartment of Physics, Hokkaido Institute of Technology, Teine-Maeda, Nishi-ku, Sapporo 006, Japan
Abstract
The variational approach which describes the local electron correlations at finite temperatures has been extended to the degenerate-band case. It reduces TC in the static approximation by a factor of two, gives realistic TC between the observed value TC (Obs) and 2TC (Obs), and suppresses the temperature independent charge fluctuation in Fe and Ni.