@article{oai:repo.qst.go.jp:00079100,
 author = {Sakai, Toru and Okamoto, Kiyomi and Tonegawa, Takashi and Toru, Sakai},
 journal = {Physical Review B},
 month = {Aug},
 note = {We investigate the S=2 antiferromagnetic quantum spin chain with the exchange and single-ion anisotropies in a magnetic field, using the numerical exact diagonalization of finite-size clusters and the level spectroscopy analysis. It is found that a magnetization plateau possibly appears at half of the saturation magnetization for some suitable anisotropy parameters. The level spectroscopy analysis indicates that the 1/2 magnetization plateau is formed by two different mechanisms, depending on the anisotropy parameters. The phase diagram of the 1/2 plateau states and some typical magnetization curves are also presented. In addition, the biquadratic interaction is revealed to enhance the plateau induced by the Haldane mechanism.},
 pages = {054407-1--054407-6},
 title = {Magnetization plateau of the S=2 antiferromagnetic Heisenberg chain with anisotropies},
 volume = {100},
 year = {2019}
}