Abstract
A long-range magnetic ordering transition in cobalt oxide $(\mathrm{CoO})$ was observed around $2.2\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ at room temperature using neutron diffraction. The magnetic structure was type-II antiferromagnetic. High-resolution synchrotron x-ray diffraction showed no evidence of a tetragonal lattice distortion in $\mathrm{CoO}$ in the magnetically ordered phase. This result indicates that the tetragonal lattice distortion occurring with magnetic ordering in the low-temperature structure of $\mathrm{CoO}$ could be associated with cooperative Jahn-Teller effects (orbital ordering), which, however, are decoupled from magnetic ordering under high pressure.
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