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The Néel order for a frustrated antiferromagnetic Heisenberg model: beyond linear spin-wave theory

Authors
Journal
Physics Letters A
0375-9601
Publisher
Elsevier
Publication Date
Volume
275
Identifiers
DOI: 10.1016/s0375-9601(00)00625-3
Disciplines
  • Physics

Abstract

Abstract Within Dyson–Maleev (DM) transformation and self-consistent mean-field treatment, the Néel order/disorder transition is studied for an antiferromagnetic Heisenberg model which is defined on a square lattice with a nearest neighbour exchange J 1 and a next-nearest neighbour exchange J 2 along only one of the diagonals. It is found that the Néel order may exist up to J 2/ J 1=0.572, beyond its classically stable regime. This result qualitatively improves that from linear spin-wave theory based on Holstein–Primakoff transformation.

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