X-ray powder diffraction (XRPD), magnetic susceptibility and muon-spin relaxation (µSR) measurements were carried out to investigate lattice symmetries and magnetic properties of one of alkali-metal superoxides, RbO2. Two structural transitions were observed around 170 and 100 K in conjunction with the appearance of anomalies in the magnetic susceptibility. A static antiferromagnetic long-range ordered state of unpaired spins on O2 dumbbells with the full magnetic volume fraction was confirmed from µSR below about 15 K. In comparison with CsO2, it is suggested that small changes in the lattice symmetry driven by changes in the O2 dumbbell orientation causes different magnetic properties in alkali-metal superoxides.
ASJC Scopus subject areas
- Physics and Astronomy(all)