Abstract
For the Heisenberg ferromagnet with the “easy-plane” type anisotropy the ground state energy and the magnetization are found with the help of perturbation theory supposing that the anisotropy energy is less than the exchange one. The study is carried out exactly without using any spin operators representation. Therefore, it is valid for a spin of any magnitude.
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Zvyagin, A.A., Tsukernik, V.M. The quantum ground state of a Heisenberg ferromagnet with an “easy-plane” type anisotropy. J Stat Phys 38, 405–411 (1985). https://doi.org/10.1007/BF01017870
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DOI: https://doi.org/10.1007/BF01017870