Geodesic
Thermodynamic properties of two-layer quasi-two-dimensional antiferromagnets
Teoretičeskaâ i matematičeskaâ fizika, Tome 168 (2011) no. 3, pp. 417-427

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For two-layer quasi-two-dimensional antiferromagnets of type YBaCuO in the Tyablikov approximation, we investigate the dependences of the energy spectrum and the temperature of transition into an ordered state on both the quasi-two-dimensionality parameter and the intensity of the exchange coupling of spin moments located in two close planes. We assume that the exchange parameters inside the CuO$_2$ planes are much greater than the exchange parameters resulting in coupling between a spin located on a plane of an elementary cell and a spin on another plane of a different elementary cell. The obtained expressions for the Néel temperature and for the sublattice magnetic moment at zero temperature describe the dependences of these quantities on the parameters of interplane exchange interactions.
Mots-clés : antiferromagnetism
Keywords: high-temperature superconductor, Tyablikov approximation, Green's function. 
@article{TMF_2011_168_3_a4,
     author = {V. V. Val'kov and A. D. Fedoseev},
     title = {Thermodynamic properties of two-layer quasi-two-dimensional antiferromagnets},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {417--427},
     publisher = {mathdoc},
     volume = {168},
     number = {3},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2011_168_3_a4/}
}
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V. V. Val'kov; A. D. Fedoseev. Thermodynamic properties of two-layer quasi-two-dimensional antiferromagnets. Teoretičeskaâ i matematičeskaâ fizika, Tome 168 (2011) no. 3, pp. 417-427. http://geodesic.mathdoc.fr/item/TMF_2011_168_3_a4/