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Physics Letters A

Series expansion study of spin-1 Heisenberg antiferromagnet with easy-plane single-ion anisotropy

Kok-Kwei Pan

Published May 26, 2010• 3 citations
Publisher
DOI
10.1016/j.physleta.2010.05.059

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We calculate ground state properties (energy, magnetization, susceptibility) and one-particle spectra for the S=1S = 1S=1 Heisenberg antiferromagnet with easy-axis or easy-plane single site anisotropy, on the square lattice. Series expansions are used, in each of three phases of the system, to obtain systematic and accurate results. The location of the quantum phase transition in the easy-plane sector is determined. The results are compared with spin-wave theory.
We calculate ground state properties (energy, magnetization, susceptibility) and one-particle spectra for the S=1S=1S=1 Heisenberg antiferromagnet with easy-axis or easy-plane single-site anisotropy on the square lattice. Series expansions are used, in each of three phases of the system, to obtain systematic and accurate results. The location of the quantum phase transition in the easy-plane sector is determined. The results are compared to spin-wave theory.