Synthesis, crystal structures and magnetism of triclinic hydrogen selenite chlorides ACu(HSeO3)Cl2 (A = Rb, Cs)

Jin, Yanling; Zhu, Wenxuan; Chen, Dan; Huang, Qingqing; Li, Yaping; Lü, Minfeng

doi:10.1016/j.ica.2023.121786

Inorganica Chimica Acta

2024

DOI: 10.1016/j.ica.2023.121786

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Synthesis, crystal structures and magnetism of triclinic hydrogen selenite chlorides ACu(HSeO3)Cl2 (A = Rb, Cs)

Yanling Jin,

Wenxuan Zhu,

Dan Chen

et al.

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Polar Layered Magnet Ba₂Cu₃(SeO₃)₄F₂ Composed of Bitriangular Chains: Observation of 1/3-Magnetization Plateau

Yalikun,

Wang,

Shi

et al. 2024

Chem. Mater.

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We prepared a new polar layered quantum magnet Ba2Cu3(SeO3)4F2, by a combined use of F– and pyramidal SeO3 2– anions, determined its crystal structure by X-ray diffraction, and characterized its magnetic properties by magnetization, electron spin resonance (ESR) and specific heat measurements, and by density functional theory calculations. The title compound has first experimentally reported bitriangular chains of Cu2+ ions aligned along the b direction to form layers parallel to the ab plane, and these layers are separated by Ba2+ ions. The magnetic susceptibility data reveal that, despite strong predominant antiferromagnetic intrachain interactions indicated by the large negative Weiss temperature θ of −143.9 K within bitriangular chains, no long-range order occurs down to 2 K. The latter, further confirmed by the specific heat measurements, is attributed to the extremely weak interlayer interaction. The spins in each bitriangular chain become ferrimagnetically ordered to exhibit a 1/3-magnetization plateau, which persists at least up to 30 T. This reveals that each bitriangular chain acts as an S = 1/2 entity at low temperatures, as observed from the decrease of the effective magnetic moment P eff from 3.67 μB in the high temperature range to 1.89 μB in the low temperature range, equivalently, from three free Cu2+ ions to only one effective Cu2+ ion per formula unit. In each layer of Ba2Cu3(SeO3)4F2, the interaction between adjacent ferrimagnetic chains is ferromagnetic rather than antiferromagnetic, contrary to the observations in other reported cases.

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Polar Layered Magnet Ba₂Cu₃(SeO₃)₄F₂ Composed of Bitriangular Chains: Observation of 1/3-Magnetization Plateau

Yalikun,

Wang,

Shi

et al. 2024

Chem. Mater.

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Synthesis, crystal structures and magnetism of triclinic hydrogen selenite chlorides ACu(HSeO3)Cl2 (A = Rb, Cs)

Cited by 1 publication

References 33 publications

Polar Layered Magnet Ba₂Cu₃(SeO₃)₄F₂ Composed of Bitriangular Chains: Observation of 1/3-Magnetization Plateau

Polar Layered Magnet Ba₂Cu₃(SeO₃)₄F₂ Composed of Bitriangular Chains: Observation of 1/3-Magnetization Plateau

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Synthesis, crystal structures and magnetism of triclinic hydrogen selenite chlorides ACu(HSeO3)Cl2 (A = Rb, Cs)

Cited by 1 publication

References 33 publications

Polar Layered Magnet Ba2Cu3(SeO3)4F2 Composed of Bitriangular Chains: Observation of 1/3-Magnetization Plateau

Polar Layered Magnet Ba2Cu3(SeO3)4F2 Composed of Bitriangular Chains: Observation of 1/3-Magnetization Plateau

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Polar Layered Magnet Ba₂Cu₃(SeO₃)₄F₂ Composed of Bitriangular Chains: Observation of 1/3-Magnetization Plateau

Polar Layered Magnet Ba₂Cu₃(SeO₃)₄F₂ Composed of Bitriangular Chains: Observation of 1/3-Magnetization Plateau