Alkali superoxide CsO2 is one of candidates for the spin-1/2 one-dimensional (1D) antiferromagnet, which may be sequentially caused by an ordering of the pi-orbital of O2- molecule below TS ~ 70 K. Here, we report on the magnetism in powder CsO2 and high-magnetic field magnetization measurements in pulsed-magnetic fields of up to 60 T. We obtained the low temperature phase diagram around the antiferromagnetic ordering temperature TN = 9.6 K under the magnetic field. At 1.3 K, remarkable up-turn curvature in the magnetization around a saturation field of ~ 60 T is found, which corresponds to the spin-1/2. We will compare it with the theoretical calculation.
@article{arxiv.1804.00377,
title = {Magnetism and high-magnetic field magnetization in alkali superoxide CsO2},
author = {Mizuki Miyajima and Fahmi Astuti and Takeshi Kakuto and Akira Matsuo and Dita P. Sari and Retno Asih and Kouichi Okunishi and Takehito Nakano and Yasuo Nozue and Koichi Kindo and Isao Watanabe and Takashi Kambe},
journal= {arXiv preprint arXiv:1804.00377},
year = {2018}
}