MgMn3(OH)(6)Cl-2 serves readily as the classical Heisenberg kagome antiferromagnet lattice spin frustration material, due to its similarity to herbertsmithite in composition and crystal structure. In this work, nanosheets of MgMn3(OH)(6)Cl-2 are synthesized through a solid-phase reaction. Low-temperature magnetic measurements revealed two antiferromagnetic transitions, occurring at similar to 8 and 55 K, respectively. Utilizing high-pressure synchrotron radiation X-ray diffraction techniques, the topological structural evolution of MgMn3(OH)(6)Cl-2 under pressures up to 24.8 GPa was investigated. The sample undergoes a second-order structural phase transition from the rhombohedral phase to the monoclinic phase at pressures exceeding 7.8 GPa. Accompanying the disappearance of the Fano-like line shape in the high-pressure Raman spectra were the emergence of new Raman active modes and discontinuities in the variations of Raman shifts in the high-frequency region. The phase transition to a structure with lower symmetry was attributed to the pressure-induced enhancement of cooperative Jahn-Teller distortion, which is caused by the mutual substitution of Mn2+ ions from the kagome layer and Mg2+ ions from the triangular interlayer. High-pressure ultraviolet-visible absorption measurements support the structural evolution. This research provides a robust experimental approach and physical insights for further exploration of classical geometrical frustration materials with kagome lattice.
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State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun,130012, ChinaState Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun,130012, China
Yang, Xiaoying
Xu, Tongge
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State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun,130012, ChinaState Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun,130012, China
Xu, Tongge
Jiang, Lina
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State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun,130012, ChinaState Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun,130012, China
Jiang, Lina
Cui, Hang
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State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun,130012, ChinaState Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun,130012, China
Cui, Hang
Zhang, Jian
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State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun,130012, ChinaState Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun,130012, China
Zhang, Jian
Ma, Yanmei
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State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun,130012, ChinaState Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun,130012, China
Ma, Yanmei
Cui, Qiliang
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State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun,130012, ChinaState Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun,130012, China