Abstract
Nonlinear susceptibility X 2 is investigated in a quasi-two-dimensional complex magnet, CoCl 2 -GIC (graphite intercalation compound). A negative divergence and another different singularity that X 2 changes its sign from negative to positive, are concluded to occur at the upper and the lower critical points in the compound by observing nonlinear magnetic response to an AC excitation field. From the facts, it is shown that the symmetry of X 2 at the critical point reveals a breaking of spatial magnetic symmetry in the examined systems. On this basis, the dynamical structure of hierarchical spin ordering is discussed.
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