The Néel order for a frustrated antiferromagnetic Heisenberg model: beyond linear spin-wave theory
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 J1 and a next-nearest neighbour exchange J2 along only one of the diagonals. It is found that the Néel order may exist up to J2/ J1=0.572, beyond its classically stable regime. This result qualitatively improves that from linear spin-wave theory based on Holstein-Primakoff transformation.
- Publication:
-
Physics Letters A
- Pub Date:
- October 2000
- DOI:
- 10.1016/S0375-9601(00)00625-3
- arXiv:
- arXiv:cond-mat/0101145
- Bibcode:
- 2000PhLA..275..481Y
- Keywords:
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- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 10 pages, 4 eps figures