Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

12-11-2020

Journal or Book Title

Physical Review Letters

Volume

125

Issue

24

First Page

247203

DOI

10.1103/PhysRevLett.125.247203

Abstract

The plateau at 1/3 of the saturation magnetization Ms 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 ΔSz=1 as measured by M, coexist with a much larger population of ΔSz=0 excitations measured by C but invisible to M. The large density of ΔSz=0 excitations, their energy gap, and their seeming lack of interaction with ΔSz=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%Ms, is consistent with fractional quantization of magnetization per site in the down-spin layers.

Comments

This article is published as LaBarre, P. G., B. Kuthanazhi, C. Abel, P. C. Canfield, and A. P. Ramirez. "Extremely Weakly Interacting ΔSz = 0 and ΔSz = 1 Excitations and Evidence for Fractional Quantization in a Magnetization Plateau: CeSb." Physical Review Letters 125, no. 24 (2020): 247203. DOI: 10.1103/PhysRevLett.125.247203. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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