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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 thepi-orbital of O2- molecule below TS ~ 70 K. Here, we report on the magnetism inpowder CsO2 and high-magnetic field magnetization measurements inpulsed-magnetic fields of up to 60 T. We obtained the low temperature phasediagram around the antiferromagnetic ordering temperature TN = 9.6 K under themagnetic field. At 1.3 K, remarkable up-turn curvature in the magnetizationaround a saturation field of ~ 60 T is found, which corresponds to thespin-1/2. We will compare it with the theoretical calculation.

Magnetism and high-magnetic field magnetization in alkali superoxide CsO2