Materials Science and Nanotechnology

Magnetic phase diagram of spatially anisotropic frustrated two-dimensional antiferromagnet

International Conference on Magnetism and Magnetic Materials
October 09-10, 2017 London, UK

Vladimir Ilkovic

Bogoliubov Laboratory of Theoretical Physics JINR, Russian Federation

Posters & Accepted Abstracts : Materials Science and Nanotechnology

Abstract:

The new magnetic materials such as the layered oxide high-temperature superconductor can be well described by the Heisenberg spin model with nearest-neighbor (NN) antiferromagnetic coupling J1 and next-nearest-neighbor (NNN) antiferromagnetic coupling J2. It is now well accepted that the model J1--J2 exhibits two phases displaying magnetic order at small J2, separated by an intermediate paramagnetic phase in the interval Jc1Jc1 it exhibits collinear stripe order. A generalization of the frustrated J1-J2 model is the J1x--J1y-J2 model where J1y is the directional anisotropy parameter. The nearest-neighbor bonds have different strength J1x and J1y in the x and y directions, respectively. The effect of the coupling J1y on the Neél and stripe states is investigated. Our aim here is to further the study of this model by using the quantum many-body Green function method. It has been applied successfully to calculate with high accuracy the properties of many lattice quantum spin systems.

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