Geodesic
On~the~theory of~impurity conduction
Teoretičeskaâ i matematičeskaâ fizika, Tome 6 (1971) no. 3, pp. 425-432

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An expression is obtained for the impurity conductivity in a very rarefied system of impurities. This is based on a model which takes into account the overlapping of the wave functions of electrons that belong to different atoms and also the random reduction in the impurity potential due to the polarization of randomly distributed atoms. It is shown that in this case the conductivity does not vanish even at $T=0$. 
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     author = {Yu. A. Bychkov and A. M. Dykhne},
     title = {On~the~theory of~impurity conduction},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {425--432},
     publisher = {mathdoc},
     volume = {6},
     number = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1971_6_3_a10/}
}
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Yu. A. Bychkov; A. M. Dykhne. On~the~theory of~impurity conduction. Teoretičeskaâ i matematičeskaâ fizika, Tome 6 (1971) no. 3, pp. 425-432. http://geodesic.mathdoc.fr/item/TMF_1971_6_3_a10/