Geodesic
Green's function of a~uniaxial ferromagnet with single-ion anisotropy and arbitrary spin in the canted phase
Teoretičeskaâ i matematičeskaâ fizika, Tome 46 (1981) no. 3, pp. 426-429

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For a uniaxial ferromagnet with single-ion anisotropy and arbitrary spin $S$ the Green's function is calculated in the case of magnetization along the hard axis. It is shown that the system has $4S$ types of excitation, consisting of $2S$ modes of opposite signs. At low temperatures, one spin-wave branch is excited, with the consequence that the thermodynamic behavior of the system is particularly simple. 
@article{TMF_1981_46_3_a15,
     author = {A. A. Kazakov},
     title = {Green's function of a~uniaxial ferromagnet with single-ion anisotropy and arbitrary spin in the canted phase},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {426--429},
     publisher = {mathdoc},
     volume = {46},
     number = {3},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1981_46_3_a15/}
}
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A. A. Kazakov. Green's function of a~uniaxial ferromagnet with single-ion anisotropy and arbitrary spin in the canted phase. Teoretičeskaâ i matematičeskaâ fizika, Tome 46 (1981) no. 3, pp. 426-429. http://geodesic.mathdoc.fr/item/TMF_1981_46_3_a15/