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DOE OSTI · 2584679

Unconventional magnetic oscillations in a kagome Mott insulator

Zheng, Guoxin [Univ. of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000254315716)·Zhu, Yuan [Univ. of Michigan, Ann Arbor, MI (United States)]·Chen, Kuan-Wen [Univ. of Michigan, Ann Arbor, MI (United States)]·Kang, Byungmin [Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)]·Zhang, Dechen [Univ. of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000187375478)·Jenkins, Kaila [Univ. of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000326301162)·Chan, Aaron [Univ. of Michigan, Ann Arbor, MI (United States)]·Zeng, Zhenyuan [Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)]·Xu, Aini [Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)]·Valenzuela, Oscar Eduardo Ayala [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)]·Blawat, Joanna [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)]·Singleton, John [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)] (ORCID:0000000161096905)·Li, Shiliang [Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China); Songshan Lake Materials Laboratory, Guangdong (China)]·Lee, Patrick A. [Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)] (ORCID:0000000178098157)·Li, Lu [Univ. of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000280547406)
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Abstract

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 an 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 $\frac{1}{9}$ 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.

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36 MATERIALS SCIENCE37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITYmagnetization plateauquantum oscillationsquantum spin liquid

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Zheng, Guoxin [Univ. of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000254315716), Zhu, Yuan [Univ. of Michigan, Ann Arbor, MI (United States)], Chen, Kuan-Wen [Univ. of Michigan, Ann Arbor, MI (United States)], Kang, Byungmin [Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)], Zhang, Dechen [Univ. of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000187375478), Jenkins, Kaila [Univ. of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000326301162), Chan, Aaron [Univ. of Michigan, Ann Arbor, MI (United States)], Zeng, Zhenyuan [Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)], Xu, Aini [Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)], Valenzuela, Oscar Eduardo Ayala [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)], Blawat, Joanna [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)], Singleton, John [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)] (ORCID:0000000161096905), Li, Shiliang [Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China); Songshan Lake Materials Laboratory, Guangdong (China)], Lee, Patrick A. [Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)] (ORCID:0000000178098157), Li, Lu [Univ. of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000280547406). 2025-01-31. Unconventional magnetic oscillations in a kagome Mott insulator. https://doi.org/10.1073/pnas.2421390122

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