Geodesic
Dynamic spin susceptibility in the $t$--$J$ model
Teoretičeskaâ i matematičeskaâ fizika, Tome 114 (1998) no. 3, pp. 426-438

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The dynamic spin susceptibility is calculated for the $t$–$J$ model in the paramagnetic phase using the memory function method in terms of the Hubbard operators. A self-consistent system of equations for the memory function is obtained in the mode-coupling approximation. Both itinerant hole excitations and localized spin fluctuations contribute to the memory function. The spin dynamics have a diffusive character in the hydrodynamic limit; spin-wave-like excitations are regained in the high-frequency region. 
@article{TMF_1998_114_3_a7,
     author = {G. Dzhakeli and N. M. Plakida},
     title = {Dynamic spin susceptibility in the $t$--$J$ model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {426--438},
     publisher = {mathdoc},
     volume = {114},
     number = {3},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1998_114_3_a7/}
}
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G. Dzhakeli; N. M. Plakida. Dynamic spin susceptibility in the $t$--$J$ model. Teoretičeskaâ i matematičeskaâ fizika, Tome 114 (1998) no. 3, pp. 426-438. http://geodesic.mathdoc.fr/item/TMF_1998_114_3_a7/