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Single-site magnetic anisotropy governed by interlayer cation charge imbalance in triangular-lattice AYbX_2

机译:单站磁各向异性由三角形晶格Aybx_2中的层间阳离子电荷不平衡控制

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摘要

The behavior in magnetic field of a paramagnetic center is characterized by its g tensor. An anisotropic form of the latter implies different kind of response along different crystallographic directions. Here we shed light on the anisotropy of the g tensor of Yb(3+ )4f(13) ions in NaYbS2 and NaYbO2, layered triangular-lattice materials suggested to host spin-liquid ground states. Using quantum chemical calculations we show that, even if the ligand-cage trigonal distortions are significant in these compounds, the decisive role in realizing strongly anisotropic, noncubic g factors is played by interlayer cation charge imbalance effects. The latter refer to the asymmetry experienced by a given Yb center due to having higher ionic charges at adjacent metal sites within the magnetic ab layer, i.e., 3+ nearest neighbors within the ab plane versus 1+ species between the magnetic layers. According to our results, this should be a rather general feature of 4f(13) layered delafossites: less interlayer positive charge is associated with stronger in-plane magnetic response.
机译:顺磁中心的磁场中的行为特征在于它的G张量。后者的各向异性形式沿不同的晶体方向呈现不同类型的响应。在这里,我们在Naybs2和Naybo2中的Yb(3+)4f(13)离子的G张浪(13)离子的v张卷(13)离子的各向异性上,层状三角形晶格材料建议宿主旋转液体地位。使用量子化学计算,我们表明,即使在这些化合物中的配体 - 笼式三角形失真中,即使在这些化合物中显着,在实现强烈各向异性的非加管G因子中的决定性作用是通过层间阳离子电荷不平衡效应来发挥的。后者是指由于在磁性AB层内的相邻金属位点处具有更高的离子电荷,即,在AB平面内的3+最近的邻居与磁性层之间的1+物种内具有更高的离子电荷,所以由给定YB中心所经历的不对称性。根据我们的结果,这应该是4F(13)分层Delafossites的一个相当一般的特征:较少的中间层正电荷与平面较强的面内磁响应相关。

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  • 来源
    《Physical review》 |2019年第17期|174436.1-174436.6|共6页
  • 作者单位

    IFW Dresden Leibniz Inst Solid State & Mat Res Helmholtzstr 20 D-01069 Dresden Germany;

    IFW Dresden Leibniz Inst Solid State & Mat Res Helmholtzstr 20 D-01069 Dresden Germany;

    IFW Dresden Leibniz Inst Solid State & Mat Res Helmholtzstr 20 D-01069 Dresden Germany|Tech Univ Dresden Dept Phys Helmholtzstr 10 D-01069 Dresden Germany;

    IFW Dresden Leibniz Inst Solid State & Mat Res Helmholtzstr 20 D-01069 Dresden Germany;

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