Magnetism and high-magnetic field magnetization in alkali superoxide CsO2

TL;DR

This study investigates the magnetic properties of alkali superoxide CsO2, revealing high-field magnetization behavior up to 60 T and providing insights into its low-temperature magnetic phase diagram and spin-1/2 characteristics.

Contribution

It presents experimental high-magnetic field magnetization data for CsO2 and compares findings with theoretical models, advancing understanding of its 1D antiferromagnetic behavior.

Findings

Magnetization shows an up-turn curvature near 60 T at 1.3 K.

The low-temperature phase diagram around TN = 9.6 K is mapped.

Evidence supports CsO2 as a spin-1/2 antiferromagnet.

Abstract

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.