Geodesic
Spectra and Localized Impurity States of One-Magnon Systems in the Heisenberg Isotropic Ferromagnetic Impurity Model
Teoretičeskaâ i matematičeskaâ fizika, Tome 126 (2001) no. 3, pp. 482-488 
S. M. Tashpulatov. Spectra and Localized Impurity States of One-Magnon Systems in the Heisenberg Isotropic Ferromagnetic Impurity Model. Teoretičeskaâ i matematičeskaâ fizika, Tome 126 (2001) no. 3, pp. 482-488. http://geodesic.mathdoc.fr/item/TMF_2001_126_3_a8/
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     author = {S. M. Tashpulatov},
     title = {Spectra and {Localized} {Impurity} {States} of {One-Magnon} {Systems} in the {Heisenberg} {Isotropic} {Ferromagnetic} {Impurity} {Model}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {482--488},
     year = {2001},
     volume = {126},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2001_126_3_a8/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

We consider a one-magnon system in the Heisenberg isotropic impurity model and investigate its spectrum and localized impurity states on the $\nu$-dimensional integral lattice $Z^{\nu}$. The system can have at most three localized impurity states (not counting the degeneracy multiplicities of their energies). We find the domains of these states and calculate the degeneracy multiplicities of their energies.

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