Bicritical or tetracritical: the 3D anisotropic Heisenberg antiferromagnet

7th Brazilian Meeting on Simulational Physics

Tsai, Shan-Ho^1,2 ; Hu, Siyan^1 ; Landau, D.P.^1

Center for Simulational Physics, University of Georgia, Athens, GA 30602, United States^1

Georgia Advanced Computing Resource Center, Enterprise Information Technology Services, University of Georgia, Athens, GA 30602, United States^2

关键词: External magnetic field;    Heisenberg;    Heisenberg antiferromagnets;    Multicritical point;    Simple-cubic lattices;    Tetracritical points;    Universality class;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/487/1/012005/pdf
DOI  :  10.1088/1742-6596/487/1/012005

来源: IOP

【 摘 要 】

The classical uniaxially anisotropic Heisenberg antiferromagnet on the simple cubic lattice, in the presence of an external magnetic field, is believed to have a multicritical point; however, there has been controversy whether it is a bicritical or a tetracritical point. We perform Monte Carlo simulations of this model and analyze the components of the staggered magnetization, the susceptibilities and the probability distribution of the magnetization to conclude that the multicritical point is bicritical and it is in the three-dimensional Heisenberg universality class.