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The plateau at 1/3 of the saturation magnetization, $M_s$, in the metamagnetCeSb is accompanied by a state of ferromagnetic layers of spins in anup-up-down sequence. We measured $M$ and the specific heat, $C$, in theplateau, spin wave analyses of which reveal two distinct branches ofexcitations. Those with $\Delta S_z = 1$ as measured by $M$, coexist with amuch larger population of $\Delta S_z = 0$ excitations measured by $C$ butinvisible to $M$. The large density of $\Delta S_z = 0$ excitations, theirenergy gap, and their seeming lack of interaction with $\Delta S_z = 1$excitations suggest an analogy with astrophysical dark matter. Additionally, inthe middle of the plateau three sharp jumps in $M(H)$ are seen, the size ofwhich, $0.15 $%$M_s$, is consistent with fractional quantization ofmagnetization-per-site in the down-spin layers.

physical review letters

Extremely Weakly Interacting $\Delta S_z = 0$ and $\Delta S_z = 1$  Excitations and Evidence for Fractional Quantization in a Magnetization  Plateau: CeSb