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

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

2001-01-10

arxiv.org/abs/cond-mat/0101145v1

Phys. Lett. A 275, 481 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 4 eps figures

Scientific paper

10.1016/S0375-9601(00)00625-3

Within Dyson-Maleev (DM) transformation and self-consistent mean-field treatment, the N\'eel 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 N\'eel 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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