Unconventional Magnetic Oscillations in Kagome Mott Insulators
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866913673441705984 |
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| author | Zheng, Guoxin Zhu, Yuan Chen, Kuan-Wen Kang, Byungmin Zhang, Dechen Jenkins, Kaila Chan, Aaron Zeng, Zhenyuan Xu, Aini Valenzuela, Oscar A. Blawat, Joanna Singleton, John Lee, Patrick A. Li, Shiliang Li, Lu |
| author_facet | Zheng, Guoxin Zhu, Yuan Chen, Kuan-Wen Kang, Byungmin Zhang, Dechen Jenkins, Kaila Chan, Aaron Zeng, Zhenyuan Xu, Aini Valenzuela, Oscar A. Blawat, Joanna Singleton, John Lee, Patrick A. Li, Shiliang Li, Lu |
| contents | In metals, electrons in a magnetic field undergo cyclotron motion, leading to oscillations in physical properties called quantum oscillations. This phenomenon has never been seen in a robust insulator because there are no mobile electrons. We report the first exception to this rule. We study a Mott insulator on a kagome lattice which does not order magnetically down to milli-Kelvin temperatures despite antiferromagnetic interactions. We observe a plateau at magnetization equal to 1/9 Bohr magneton per magnetic ion, accompanied by oscillations in the magnetic torque, reminiscent of quantum oscillations in metals. The temperature dependence obeys Fermi distribution. These phenomena are consistent with a quantum spin liquid state whose excitations are fermionic spinons with a Dirac-like spectrum coupled to an emergent gauge field. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_07989 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Unconventional Magnetic Oscillations in Kagome Mott Insulators Zheng, Guoxin Zhu, Yuan Chen, Kuan-Wen Kang, Byungmin Zhang, Dechen Jenkins, Kaila Chan, Aaron Zeng, Zhenyuan Xu, Aini Valenzuela, Oscar A. Blawat, Joanna Singleton, John Lee, Patrick A. Li, Shiliang Li, Lu Strongly Correlated Electrons In metals, electrons in a magnetic field undergo cyclotron motion, leading to oscillations in physical properties called quantum oscillations. This phenomenon has never been seen in a robust insulator because there are no mobile electrons. We report the first exception to this rule. We study a Mott insulator on a kagome lattice which does not order magnetically down to milli-Kelvin temperatures despite antiferromagnetic interactions. We observe a plateau at magnetization equal to 1/9 Bohr magneton per magnetic ion, accompanied by oscillations in the magnetic torque, reminiscent of quantum oscillations in metals. The temperature dependence obeys Fermi distribution. These phenomena are consistent with a quantum spin liquid state whose excitations are fermionic spinons with a Dirac-like spectrum coupled to an emergent gauge field. |
| title | Unconventional Magnetic Oscillations in Kagome Mott Insulators |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2310.07989 |