Spatially Anisotropic Spin J1-J2 Heisenberg Model for an Antiferromagnetic Square Lattice: Phase Diagrams |
| V. Ilkovič
Bogoliubov Laboratory of Theoretical Physics, JINR, 141980 Dubna, Moscow region, Russia and Permanent address: Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovak Republi |
| Received: July 19, 2017; In final form: November 28, 2017 |
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| The new magnetic materials such as the layered oxide high-temperature superconductor can be well described by the Heisenberg spin model with nearest-neighbor coupling J1 and next-nearest-neighbor coupling J2. A generalization of the J1-J2 model is the J1x-J1y-J2 model where the nearest-neighbor bonds have different strengths J1x and J1y in the x and y directions, respectively. The effect of the couplings J2 and J1y on the antiferromagnetic Néel state is investigated within the quantum many-body Green function method. |
DOI: 10.12693/APhysPolA.133.206 PACS numbers: 75.10.Jm, 75.30.Ds, 75.30.Kz, 75.70.Ak |