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Magnetoelastic couplings in the deformed kagome quantum spin lattice of volborthite

机译:岩体变形的Kagome Quantum旋转晶格中的磁形弹性联轴器

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摘要

Microscopic spin interactions on a deformed kagome lattice of volborthite are investigated through magnetoelastic couplings. A negative longitudinal magnetostriction Delta L/L 0 in the b axis is observed, which depends on the magnetization M with a peculiar relation of Delta L/L alpha M-1.3. Based on the exchange striction model, it is argued that the negative magnetostriction originates from a pantographlike lattice change of the Cu-O-Cu chain in the b axis, and that the peculiar dependence arises from the local spin correlation. This idea is supported by DFT+U calculations simulating the lattice change and a finite-size calculation of the spin correlation, indicating that the recently proposed coupled-trimer model is a plausible one.
机译:通过磁性联轴器研究了变形的volbortite的变形kagome晶格上的微观自旋相互作用。观察到B轴中的负纵向磁致伸缩δL/ L <0,这取决于磁化M,其具有ΔL/ Lαm-1.3的特殊关系。基于交换划分模型,认为负磁致伸缩源自B轴在B轴中的Cu-O-Cu链的Pantographl晶格变化,并且特殊依赖性产生局部旋转相关性。 DFT + U计算支持这种想法,模拟晶格变化和旋转相关性的有限尺寸计算,表明最近提出的耦合三聚体模型是合理的。

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  • 来源
    《Physical review》 |2019年第14期|140412.1-140412.5|共5页
  • 作者单位

    Univ Tokyo Inst Solid State Phys Kashiwa Chiba Japan;

    Univ Tokyo Dept Phys Tokyo Japan;

    TU Wien Inst Festkorperphys Wiedner Hauptstr 8-10 Vienna Austria|IFW Dresden Inst Theoret Solid State Phys Helmholtzstr 20 D-01069 Dresden Germany;

    Univ Tokyo Inst Solid State Phys Kashiwa Chiba Japan;

    Univ Tokyo Inst Solid State Phys Kashiwa Chiba Japan;

    Univ Tokyo Inst Solid State Phys Kashiwa Chiba Japan;

    Univ Tokyo Inst Solid State Phys Kashiwa Chiba Japan;

    Univ Stuttgart Inst Funkt Mat & Quantentechnol Stuttgart Germany;

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