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S. Khmelevskyi, T. Khmelevska, A.V. Ruban, P. Mohn:
"Magnetic exchange interactions in the paramagnetic state of hcp Gd\";
Journal of Physics: Condensed Matter, 19 (2007), 3262181 - 3262187.

We use the first-principles magnetic force theorem embodied in the Korringa-
Kohn-Rostoker method to calculate pair magnetic exchange interactions in
pure hexagonal close packed (hcp) Gd metal in the ferromagnetic as well as
in the paramagnetic state with disordered local 4f-moments. It is found that
the exchange interactions between the localized 4f-moments, in particular also
distant ones, depend on the state of magnetic disorder. Such a dependence is
a consequence of the electronic structure changes of the conduction band that
mediates the interaction between the local moments. The magnetic ordering
temperature has been calculated using a Monte Carlo simulation technique and
the results are compared with mean-field based studies.\