TY - JOUR
T1 - Exact Results for Spin-Wave Renormalisation in Heisenberg and Planar Ferromagnets
AU - Rastelli, E.
AU - Lindgård, Per-Anker
PY - 1979
Y1 - 1979
N2 - An exact perturbation expansion, to the order 1/S2, is derived for the Heisenberg ferromagnet. The equivalence of the Dyson-Maleev (DM), Holstein-Primakoff (HP) and matching-of-matrix-element (MME) transformations is proven. They give identical T5/2 and T4 coefficients. For the planar ferromagnet, an exact expansion in anisotropy against exchange field proves the equivalence of the HP and MME transformations. Several explicit results and numerical estimates are given.
AB - An exact perturbation expansion, to the order 1/S2, is derived for the Heisenberg ferromagnet. The equivalence of the Dyson-Maleev (DM), Holstein-Primakoff (HP) and matching-of-matrix-element (MME) transformations is proven. They give identical T5/2 and T4 coefficients. For the planar ferromagnet, an exact expansion in anisotropy against exchange field proves the equivalence of the HP and MME transformations. Several explicit results and numerical estimates are given.
U2 - 10.1088/0022-3719/12/10/021
DO - 10.1088/0022-3719/12/10/021
M3 - Journal article
SN - 0022-3719
VL - 12
SP - 1899
EP - 1916
JO - Journal of Physics C: Solid State Physics
JF - Journal of Physics C: Solid State Physics
IS - 10
ER -