Geodesic
Interaction of a conduction electron with critical fluctuations of the spin density in the $s$-$d$ exchange model of a magnetic semiconductor. Estimate of the free energy and static conductivity
Teoretičeskaâ i matematičeskaâ fizika, Tome 43 (1980) no. 2, pp. 261-272 
M. I. Auslender; M. I. Katsnel'son. Interaction of a conduction electron with critical fluctuations of the spin density in the $s$-$d$ exchange model of a magnetic semiconductor. Estimate of the free energy and static conductivity. Teoretičeskaâ i matematičeskaâ fizika, Tome 43 (1980) no. 2, pp. 261-272. http://geodesic.mathdoc.fr/item/TMF_1980_43_2_a8/
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     author = {M. I. Auslender and M. I. Katsnel'son},
     title = {Interaction of~a~conduction electron with critical fluctuations of~the spin density in~the $s$-$d$~exchange model of~a~magnetic semiconductor. {Estimate} of~the free energy and static conductivity},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {261--272},
     year = {1980},
     volume = {43},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1980_43_2_a8/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Estimates of the free energy of conductivity electrons coupling with $T\gtrsim T_c$ critical spin density fluctuations are obtained by means of Feynman path integral technique and corresponding variational principle. Condition is found under which the fluctuations may be treated as gaussian ones; the opposite case of the Kac model for spin subsystem is also considered. The relations between the quantum-statistical approach proposed and the phenomenological theory [1, 13] is briefly discussed. In the gaussian case the expression for the static critical conductivity is obtained which is calculated in the considered regions of values of model parameters.

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