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- W2045282551 abstract "Dyson (1956) showed that the bosonic approximation in the Hartree-Fock scheme is valid for the isotropic Heisenberg ferromagnet at low temperatures while evident inconsistencies arise if one considers the single-ion anisotropy. For the Heisenberg uniaxial antiferromagnet, a very simple rule D to D(1-1/2S) (where D is the anisotropy strength) was suggested by Rastelli and his co-workers (1974) to restore the kinematical consistency on the basis of the 1/z expansion of repeated scattering processes due to the anisotropy. Balucani and his co-workers (1979) considered the same prescription for the Heisenberg uniaxial ferromagnet and demonstrated that it is true if one takes into account all the contributions proportional to D. The authors have calculated all the contributions in D up to infinite order in the ladder approximation. They find that the exact result is kinematically consistent and agrees with the suggestion of Balucani and his co-workers for small anisotropy but differs from it for strong anisotropy." @default.
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- W2045282551 date "1980-08-20" @default.
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- W2045282551 title "Exact low-temperature self-energy of the uniaxial Heisenberg ferromagnet" @default.
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- W2045282551 doi "https://doi.org/10.1088/0022-3719/13/23/022" @default.
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