Thermodynamic Evidence of Fermionic Behavior in the Vicinity of One-Ninth Plateau in a Kagome Antiferromagnet

IF 15.7 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Guoxin Zheng, Dechen Zhang, Yuan Zhu, Kuan-Wen Chen, Aaron Chan, Kaila Jenkins, Byungmin Kang, Zhenyuan Zeng, Aini Xu, D. Ratkovski, Joanna Blawat, Alimamy F. Bangura, John Singleton, Patrick A. Lee, Shiliang Li, Lu Li
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引用次数: 0

Abstract

The spin-1/2 kagome Heisenberg antiferromagnets are believed to host exotic quantum entangled states. Recently, the reports of 1/9 magnetization plateau and magnetic oscillations in a kagome antiferromagnet YCu3(OH)6Br2[Brx(OH)1x] (YCOB) have made this material a promising candidate for experimentally realizing quantum spin liquid states. Here, we present measurements of the specific heat Cp in YCOB in high magnetic fields (up to 41.5 T) down to 0.46 K, and the 1/9 plateau feature has been confirmed. Moreover, the temperature dependence of Cp/T in the vicinity of 1/9 plateau region can be fitted by a linear in T term which indicates the presence of a Dirac spectrum, together with a constant term, which indicates a finite density of states contributed by other spinon Fermi surfaces. Surprisingly, the constant term is highly anisotropic in the direction of the magnetic field. Additionally, we observe a double-peak feature near 30 T above the 1/9 plateau which is another hallmark of fermionic excitations in the specific heat. This combination of gapless behavior and the double-peak structure strongly suggests that the 1/9 plateau in YCOB is nontrivial and hosts fermionic quasiparticles. Published by the American Physical Society 2025
Kagome反铁磁体中九分之一高原附近费米子行为的热力学证据
自旋为1/2的kagome海森堡反铁磁体被认为具有奇异的量子纠缠态。最近,kagome反铁磁体YCu3(OH)6Br2[Brx(OH)1−x] (YCOB)中1/9的磁化平台和磁振荡的报道使该材料成为实验实现量子自旋液态的有希望的候选材料。在此,我们给出了在高磁场(高达41.5 T)降至0.46 K时YCOB比热Cp的测量结果,并证实了1/9平台特征。此外,在1/9平台区附近,Cp/T的温度依赖性可以用一个线性的T项来拟合,这表明存在狄拉克谱,同时还有一个常数项,这表明其他自旋子费米面贡献的态密度有限。令人惊讶的是,常数项在磁场方向上是高度各向异性的。此外,我们观察到在1/9平台以上30 T附近的双峰特征,这是费米子激发在比热中的另一个标志。这种无间隙行为和双峰结构的结合强烈表明,YCOB中的1/9平台是非平凡的,并且含有费米子准粒子。2025年由美国物理学会出版
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来源期刊
Physical Review X
Physical Review X PHYSICS, MULTIDISCIPLINARY-
CiteScore
24.60
自引率
1.60%
发文量
197
审稿时长
3 months
期刊介绍: Physical Review X (PRX) stands as an exclusively online, fully open-access journal, emphasizing innovation, quality, and enduring impact in the scientific content it disseminates. Devoted to showcasing a curated selection of papers from pure, applied, and interdisciplinary physics, PRX aims to feature work with the potential to shape current and future research while leaving a lasting and profound impact in their respective fields. Encompassing the entire spectrum of physics subject areas, PRX places a special focus on groundbreaking interdisciplinary research with broad-reaching influence.
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