Geodesic
Construction of the correlation functions of the Heisenberg ferromagnet in the ferromagnetic and paramagnetic regions
Teoretičeskaâ i matematičeskaâ fizika, Tome 40 (1979) no. 2, pp. 251-268

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For the Heisenberg ferromagnet, a modified random phase approximation is proposed that takes into account the kinematic properties of the spin operators. Correlation functions of the transverse and longitudinal components of the spin are obtained which are valid at temperatures both above and below the Curie point. 
@article{TMF_1979_40_2_a7,
     author = {Yu. A. Tserkovnikov},
     title = {Construction of the correlation functions of the {Heisenberg} ferromagnet in the ferromagnetic and paramagnetic regions},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {251--268},
     publisher = {mathdoc},
     volume = {40},
     number = {2},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1979_40_2_a7/}
}
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Yu. A. Tserkovnikov. Construction of the correlation functions of the Heisenberg ferromagnet in the ferromagnetic and paramagnetic regions. Teoretičeskaâ i matematičeskaâ fizika, Tome 40 (1979) no. 2, pp. 251-268. http://geodesic.mathdoc.fr/item/TMF_1979_40_2_a7/