Programme

P.28 -- Poster, VCTP-48

Date: Tuesday, 1 August 2023

Time: 08:30 - 10:00

Magnetic properties of the spin-1 J1-J3 Heisenberg model on a triangular lattice

Nguyen Van Hinh (1), Pham Thi Thanh Nga (2) and Nguyen Toan Thang (3)

(1) Hanoi University of Industry, 298 Cau Dien, Bac Tu Liem, Hanoi, Vietnam; (2) Faculty of Electrical and Electronics Engineering, Thuyloi University, 175 Tay Son, Dong Da, Hanoi, Vietnam; (3) Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Hanoi, Vietnam

We study the spin-1 J1-J3 Heisenberg model with antiferromagnetic nearest neighbors J1> 0 and the ferromagnetic third neighbor J3 < 0 for a triangular lattice. The ground-state and thermodynamic properties are evaluated from the Popov-Fedotov functional integral method and the Luttinger-Tisza procedure. Perturbation expansion of the auxiliary field around mean-field theory was carried out to investigate the effect of thermal fluctuations on ground state energy and sublattice magnetization. The results are compared with those of the spin wave approximation and experimental data on the compound NiGa2S4.

Presenter: Phạm Thị Thanh Nga