Extremely Weakly Interacting ΔS_z = 0 and ΔS_z = 1 Excitations and Evidence for Fractional Quantization in a Magnetization Plateau: CeSb

LaBarre P. G.; Kuthanazhi B.; Abel C.; Canfield P. C.; Ramirez A. P.

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Extremely Weakly Interacting ΔS_z = 0 and ΔS_z = 1 Excitations and Evidence for Fractional Quantization in a Magnetization Plateau: CeSb

机译：极其弱相互作用ΔS_Z= 0和ΔS_Z= 1激励和磁化高原分数量化的激励和证据：CESB

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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 AS, = 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.

机译：在Metamagnet CESB中的饱和磁化强度M-S的1/3的平台伴随着上下序列中的旋转的铁磁层的状态。我们测量了高原中的M和特定的热量C，旋转波分析，其揭示了两个不同的激励分支。由ΔSz= 1的那些由m测量，与C的ΔSz= 0的更大群体共存，例如由C测量的ΔSz= 0的激发。ΔSz= 0激发的大密度，它们的能量隙，它们的似乎缺乏与AS的相互作用，= 1激动表明了与天体物理暗物质的类比。另外，在高原的中间，看到M（h）中的三个急剧跳跃，其尺寸为0.15％M-S，与下旋转层中每个位点的磁化分数化一致。

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《Physical review letters》 |2020年第24期|247203.1-247203.6|共6页
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LaBarre P. G.; Kuthanazhi B.; Abel C.; Canfield P. C.; Ramirez A. P.;
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Univ Calif Santa Cruz Dept Phys Santa Cruz CA 95064 USA;

Iowa State Univ Dept Phys & Astron Ames IA 50011 USA|Iowa State Univ Ames Lab Ames IA 50011 USA;

Iowa State Univ Dept Phys & Astron Ames IA 50011 USA|Iowa State Univ Ames Lab Ames IA 50011 USA;

Iowa State Univ Dept Phys & Astron Ames IA 50011 USA|Iowa State Univ Ames Lab Ames IA 50011 USA;

Univ Calif Santa Cruz Dept Phys Santa Cruz CA 95064 USA;

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6. Extremely Weakly Interacting ΔSz=0 and ΔSz=1 Excitations and Evidence for Fractional Quantization in a Magnetization Plateau: CeSb [O] . P. G. LaBarre, B. Kuthanazhi, C. Abel, 2020

机译：极其弱相互作用ΔSZ= 0和ΔSZ= 1磁化高原分数化的激励和证据：CESB

Extremely Weakly Interacting ΔS_z = 0 and ΔS_z = 1 Excitations and Evidence for Fractional Quantization in a Magnetization Plateau: CeSb

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