High-Pressure Induced Continuous Structural Evolution of Kagome Antiferromagnet MgMn3(OH)6Cl2: A Structural Analogue to Quantum Spin Liquid Herbertsmithite

被引:0
|
作者
Yang, Xiaoying [1 ]
Xu, Tongge [1 ]
Zhang, Jian [1 ]
Cui, Hang [1 ]
Jiang, Lina [1 ]
Ma, Yanmei [1 ]
Cui, Qiliang [1 ]
机构
[1] Jilin Univ, Coll Phys, State Key Lab Superhard Mat, Changchun 130012, Peoples R China
基金
中国国家自然科学基金;
关键词
FRACTIONALIZED EXCITATIONS;
D O I
10.1021/acs.inorgchem.4c00967
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
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.
引用
收藏
页码:12445 / 12456
页数:12
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