Thermodynamic evidence of fermionic behavior in the vicinity of one-ninth plateau in a kagome antiferromagnet
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| _version_ | 1866918168367202304 |
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| author | Zheng, Guoxin Zhang, Dechen Zhu, Yuan Chen, Kuan-Wen Chan, Aaron Jenkins, Kaila Kang, Byungmin Zeng, Zhenyuan Xu, Aini Ratkovski, D. Blawat, Joanna Bangura, Ali Singleton, John Lee, Patrick A. Li, Shiliang Li, Lu |
| author_facet | Zheng, Guoxin Zhang, Dechen Zhu, Yuan Chen, Kuan-Wen Chan, Aaron Jenkins, Kaila Kang, Byungmin Zeng, Zhenyuan Xu, Aini Ratkovski, D. Blawat, Joanna Bangura, Ali Singleton, John Lee, Patrick A. Li, Shiliang Li, Lu |
| contents | The spin-1/2 kagome Heisenberg antiferromagnets are believed to host exotic quantum entangled states. Recently, the report of 1/9 magnetization plateau and magnetic oscillations in a kagome antiferromagnet YCu$_3$(OH)$_6$Br$_2$[Br$_x$(OH)$_{1-x}$] (YCOB) have made this material a promising candidate for experimentally realizing quantum spin liquid states. Here we present measurements of the specific heat $C_p$ in YCOB in high magnetic fields (up to 41.5 Tesla) down to 0.46 Kelvin, and the 1/9 plateau feature has been confirmed. Moreover, the temperature dependence of $C_p/T$ 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 (DOS) contributed by other 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_05600 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Thermodynamic evidence of fermionic behavior in the vicinity of one-ninth plateau in a kagome antiferromagnet Zheng, Guoxin Zhang, Dechen Zhu, Yuan Chen, Kuan-Wen Chan, Aaron Jenkins, Kaila Kang, Byungmin Zeng, Zhenyuan Xu, Aini Ratkovski, D. Blawat, Joanna Bangura, Ali Singleton, John Lee, Patrick A. Li, Shiliang Li, Lu Strongly Correlated Electrons The spin-1/2 kagome Heisenberg antiferromagnets are believed to host exotic quantum entangled states. Recently, the report of 1/9 magnetization plateau and magnetic oscillations in a kagome antiferromagnet YCu$_3$(OH)$_6$Br$_2$[Br$_x$(OH)$_{1-x}$] (YCOB) have made this material a promising candidate for experimentally realizing quantum spin liquid states. Here we present measurements of the specific heat $C_p$ in YCOB in high magnetic fields (up to 41.5 Tesla) down to 0.46 Kelvin, and the 1/9 plateau feature has been confirmed. Moreover, the temperature dependence of $C_p/T$ 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 (DOS) contributed by other 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. |
| title | Thermodynamic evidence of fermionic behavior in the vicinity of one-ninth plateau in a kagome antiferromagnet |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2409.05600 |