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Neel temperature and reentrant H-T phase diagram of quasi-two-dimensional frustrated magnets

机译:准二维受挫磁体的Neel温度和折返H-T相图

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摘要

In quasi-two-dimensional (quasi-2D) quantum magnets, the ratio of Neel temperature T_N to Curie-Weiss temperature Θ_(CW) is frequently used as an empirical criterion to judge the strength of frustration. In this work, we investigate how these quantities are related in the canonical quasi-2D frustrated square or triangular J_1-J_2 model. Using the self-consistent Tyablikov approach for calculating T_N we show their dependence on the frustration control parameter J_2/J_1 in the whole Neel and columnar antiferromagnetic phase region. We also discuss approximate analytical results. In addition, the field dependence of T_N(H) and the associated possible reentrance behavior of the ordered moment due to quantum fluctuations are investigated. These results are directly applicable to a class of quasi-2D oxovanadate antiferromagnets. We give clear criteria to judge under which conditions the empirical frustration ratio f = Θ_(CW) / T_N may be used as measure of frustration strength in the quasi-2D quantum magnets.
机译:在准二维(准2D)量子磁体中,尼尔温度T_N与居里-魏斯温度Θ_(CW)之比经常用作判断挫折强度的经验标准。在这项工作中,我们研究了在准2D受挫正方形或三角形J_1-J_2模型中这些量之间的关系。使用自洽Tyablikov方法计算T_N时,我们显示了它们在整个Neel和柱状反铁磁相区域中对挫折控制参数J_2 / J_1的依赖性。我们还将讨论近似的分析结果。此外,研究了T_N(H)的场相关性以及由于量子涨落而引起的有序矩的相关可能重入行为。这些结果直接适用于一类准2D氧钒酸盐反铁磁体。我们给出明确的标准,以判断在何种条件下经验挫折比f =Θ_(CW)/ T_N可用作准2D量子磁体中挫折强度的度量。

著录项

  • 来源
    《Physical review》 |2017年第21期|214443.1-214443.15|共15页
  • 作者单位

    Max Planck Institute for the Chemical Physics of Solids, 01187 Dresden, Germany;

    Max Planck Institute for the Chemical Physics of Solids, 01187 Dresden, Germany;

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  • 正文语种 eng
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