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首页> 外文期刊>Physical review.B.Condensed matter and materials physics >Magnetic interactions in the tripod kagome antiferromagnet Mg_2Gd_3Sb_3O_(14) probed by static magnetometry and high-field ESR spectroscopy
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Magnetic interactions in the tripod kagome antiferromagnet Mg_2Gd_3Sb_3O_(14) probed by static magnetometry and high-field ESR spectroscopy

机译：通过静态磁力测电和高场ESR光谱探测的三脚架Kagome反霉菌MG_2GD_3SB_3O_（14）中的磁交互

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摘要

We report an experimental study of the static magnetization M(H, T) and high-field electron spin resonance (ESR) of polycrystalline Mg_2Gd_3Sb_3O_(14), a representative member of the newly discovered class of the so-called tripod kagome antiferromagnets where the isotropic Gd~(3+) spins (S = 7/2) form a two-dimensional kagome spin-frustrated lattice. It follows from the analysis of the low-T M(H) curves that the Gd~(3+) spins are coupled by a small isotropic antiferromagnetic (AFM) exchange interaction, |J|≈0.3 K. The M(H, T) dependences measured down to 0.5 K evidence a long-range AFM order at T_N = 1.7 K and its rapid suppression at higher fields, ≥4 T. ESR spectra measured in fields up to 15 T are analyzed considering possible effects of demagnetizing fields, single-ion anisotropy, and spin-spin correlations. While the demagnetization effects due to a large sample magnetization in high fields and its shape anisotropy become relevant at low temperatures, the broadening of the ESR line commencing already at T ≤ 30 K may indicate the onset of the spin-spin correlations far above the ordering temperature due to the geometrical spin frustration in this compound.
机译：我们报告了对多晶MG_2GD_3SB_3O_（14）的静磁化M（H，T）和高场电子自旋共振（ESR）的实验研究，该代表性成员的新发现的三脚架kagome反铁磁体的代表成员各向同性Gd〜（3+）旋转（S = 7/2）形成二维kagome自旋沮丧的格子。因此，从低T m（h）曲线的分析中，Gd〜（3+）旋转通过小的各向同性反铁磁性（AFM）交换相互作用，| j |≈0.3k.M（h，t ）测量到0.5克证据的依赖性在T_N = 1.7 k下的远程AFM顺序及其在较高领域的快速抑制，≥4吨，考虑到退磁领域的可能效果，分析了在最多15吨的字段中测量的ESR光谱。 - 激动的各向异性和旋转旋转相关性。虽然在高温下具有大的样品磁化引起的造成的去磁效应变得在低温下变得相关，但是已经在T≤30k处开始的ESR线的扩展可以指示远高于订购的旋转旋转相关性的开始由于该化合物的几何自旋挫折而导致的温度。

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  • 来源
    《Physical review.B.Condensed matter and materials physics》 |2020年第21期|214414.1-214414.11|共11页
  • 作者

    C. Wellm; J. Zeisner; A. Alfonsov; M.-I. Sturza; G. Bastien; S. Gass; S. Wurmehl; A. U. B. Wolter; B. Buechner; V. Kataev;

  • 作者单位

    Leibniz IFW Dresden 01069 Dresden Germany Institute for Solid State and Materials Physics TU Dresden 01069 Dresden Germany;

    Leibniz IFW Dresden 01069 Dresden Germany Institute for Solid State and Materials Physics TU Dresden 01069 Dresden Germany;

    Leibniz IFW Dresden 01069 Dresden Germany;

    Leibniz IFW Dresden 01069 Dresden Germany;

    Leibniz IFW Dresden 01069 Dresden Germany;

    Leibniz IFW Dresden 01069 Dresden Germany;

    Leibniz IFW Dresden 01069 Dresden Germany;

    Leibniz IFW Dresden 01069 Dresden Germany;

    Leibniz IFW Dresden 01069 Dresden Germany Institute for Solid State and Materials Physics and Wuerzburg-Dresden Cluster of Excellence ct.qmat TU Dresden D-01062 Dresden Germany;

    Leibniz IFW Dresden 01069 Dresden Germany;

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