Back to Search Start Over

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

Authors :
LaBarre, Patrick G.
Kuthanazhi, Brinda
Abel, Caiden
Canfield, Paul C.
Ramirez, Arthur P.
Source :
Phys. Rev. Lett. 125, 247203 (2020)
Publication Year :
2020

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.<br />Comment: 13 pages, 4 figures. Supplemental Information 4 pages, 3 figures

Details

Database :
arXiv
Journal :
Phys. Rev. Lett. 125, 247203 (2020)
Publication Type :
Report
Accession number :
edsarx.2004.05236
Document Type :
Working Paper
Full Text :
https://doi.org/10.1103/PhysRevLett.125.247203