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arXiv · 2004.05236

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

Patrick G. LaBarre·Brinda Kuthanazhi·Caiden Abel·Paul C. Canfield·Arthur P. Ramirez
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Abstract

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

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Patrick G. LaBarre, Brinda Kuthanazhi, Caiden Abel, Paul C. Canfield, Arthur P. Ramirez. 2020-04-10. Extremely Weakly Interacting $\Delta S_z = 0$ and $\Delta S_z = 1$ Excitations and Evidence for Fractional Quantization in a Magnetization Plateau: CeSb. https://doi.org/10.1103/physrevlett.125.247203

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