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Absence of magnetic ordering and field-induced phase diagram in the gadolinium aluminum garnet

机译：aluminum铝石榴石中没有磁序和磁场感应相图

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摘要

The robustness of spin liquids with respect to small perturbations, and the way magnetic frustration can be lifted by slight changes in the balance between competing magnetic interactions, remains a rich and open issue. We address this question through the study of the gadolinium aluminum garnet Gd_3Al_5O_(12), a related compound to the extensively studied Gd_3Ga_5O_(12). We report on its magnetic properties at very low temperatures. We show that despite a freezing at about 300 mK, no magnetic transition is observed, suggesting the presence of a spin-liquid state down to the lowest temperatures, similarly to Gd_3Ga_5O_(12), in spite of a larger ratio between exchange and dipolar interactions. Finally, the phase diagram as a function of field and temperature is strongly reminiscent of the one reported in Gd_3Ga_5O_(12). This study reveals the robust nature of the spin-liquid phase for Gd ions on the garnet lattice, in stark contrast to Gd ions on the pyrochlore lattice for which a slight perturbation drives the compound into a range of magnetically ordered states.
机译：自旋液体相对于小扰动的鲁棒性，以及通过竞争性磁相互作用之间的平衡的微小变化来消除磁阻的方式仍然是一个悬而未决的问题。我们通过研究aluminum铝石榴石Gd_3Al_5O_（12）（与广泛研究的Gd_3Ga_5O_（12）相关的化合物）解决了这个问题。我们报告了其在极低温度下的磁性能。我们表明，尽管在大约300 mK处冻结，但未观察到磁跃迁，这表明自旋液体状态一直存在到最低温度，类似于Gd_3Ga_5O_（12），尽管交换和偶极相互作用之间的比率较大。最后，作为场和温度的函数的相图强烈地让人联想到Gd_3Ga_5O_（12）中报道的相图。这项研究揭示了石榴石晶格上Gd离子的自旋液相的鲁棒性，与烧绿石晶格上的Gd离子形成轻微的扰动使该化合物变成一系列磁有序态，这与之形成鲜明的对比。

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  • 来源
    《Physical review》 |2017年第22期|220413.1-220413.5|共5页
  • 作者

    O. Florea; E. Lhotel; H. Jacobsen; C. S. Knee; P. P. Deen;

  • 作者单位

    Institut Neel, CNRS & Universite Grenoble Alpes, Grenoble, France;

    Institut Neel, CNRS & Universite Grenoble Alpes, Grenoble, France;

    Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark,European Spalliation Source, Lund, Sweden,Department of Physics, Oxford University, Oxford, United Kingdom;

    Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Gothenburg, Sweden;

    Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark,European Spalliation Source, Lund, Sweden;

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