Programme

P.26 -- Poster, VCTP-45

Date: Tuesday, 13 October 2020

Time: 08:30 - 10:00

Magnetic competition in magnetic topological kagome systems

Tran Thi Thanh Mai, Nguyen Duong Bo, Nguyen Hong Son, Tran Minh Tien

Faculty of Physics, Hanoi National University of Education, Hanoi, Vietnam Institute of Physics, Vietnam Academy of Science and Technology, Hanoi, Vietnam

A minimal model is proposed to describe the magnetic competition between out-plane and in-plane magnetizations observed in topological kagome magnets. The model consists of the spin-orbit, an anisotropic Hund and an anisotropic spin exchange couplings. Using variational calculations based on the Bogoluibov inequality, we find the ground state is either the out-plane ferromagnetic or the in-plane 120 antiferromagnetic, depending on the model parameters. There is a crossover from the in-plane 120 antiferromagnetism to the out-plane ferromagnetism when temperature decreases. In the crossing region, the in-plane 120 antiferromagnetism and the out-plane ferromagnetism coexists. A universal relation between the in-plane and the out-plane components of the Hund and the spin-exchange couplings is obtained.

Presenter: Trần Minh Tiến

Presentation file: