Program

P.14 -- Poster, NCTP-42

Date: Tuesday, 1 August 2017

Time: 16h00 - 17h30

Magnetic orders in spin - one Heisenberg antiferromagnets on interpolating linear chain - square – triangular lattice: exact constraint of single occupancy condition

Pham Thi Thanh Nga (1), Trinh Thi Thuy (2) and Nguyen Toan Thang (3)

(1) Thuyloi University, 175 Tay Son, Dong Da, Hanoi; (2) Hanoi National University of Education, 136 Xuan Thuy, Hanoi; (3) Institute of Physics, 10 Dao Tan, Hanoi.

We study the spin - one antiferomagnetic Heisenberg model on a square lattice with nearest neighbor interaction J1 and a second neighbor interaction J2 along only one of the diagonals of the squares using the Popov-Fedotov representation of spin operators. In this approach the constraint of single particle site occupation is rigorously fulfilled by introducing an imaginary valued chemical potential. We consider a Neel antiferromagnetic phase and an incomensurate spiral phase in one loop approximation. The results are compared with the results obtained by the same formalism for the case of spin - one and by Holstein-Primakov representation for the case of spin – half.

Presenter: Pham Thi Thanh Nga