论文标题
类似Ising的稀土磁铁的磁性：d-er $ _ {2} $ si $ _ {2} $ o $ $ $ _ {7} $
Magnetic Properties of the Ising-like Rare Earth Pyrosilicate: D-Er$_{2}$Si$_{2}$O$_{7}$
论文作者
论文摘要
类似ISING的Spin-1/2磁性材料对其与理论的现成联系很感兴趣，尤其是在量子临界行为的背景下。在这项工作中，我们报告了有关稀土热硅酸盐家族成员的磁性特性的详细研究，D-er $ _ {2} $ si $ _ {2} $ o $ $ $ _ {7} $，众所周知，它显示出一种高度各向异性的ISing Ising类似于G-Tensor和有效的Spin-1/2磁性磁性计。我们使用粉末中子衍射，粉末非弹性中子光谱（INS）和单晶AC敏感性来表征其磁性。中子衍射使我们能够在零场中确定已知过渡温度（$ t_ {n} $ = 1.9 k）以下的磁性结构，证实磁状态是具有两个非连续性ISING轴的四式抗抗抗磁力结构，如先前假设。我们的粉末INS数据显示，零场的激发幅度与各向异性（可能是ISING）交换一致。 1 t的施加场会产生模式软化，这与场诱导的二阶相变。要评估D-ER $ _ {2} $ si $ _ {2} $ o $ $ $ _ {7} $与横向字段iSing模型的相关性，我们在单个晶体上执行了AC敏感性测量值，其磁场横向横向到Ising Axes。这揭示了在0.1 K时在2.65 t处发生的过渡，该场明显高于粉末ins观察到的模式的田地，表明磁场诱导的相变为高度磁场方向，取决于预期。这些测量结果表明D-er $ _ {2} $ si $ _ {2} $ o $ _ {7} $可能是与横向字段ISING模型相关的进一步探索的候选人。
Ising-like spin-1/2 magnetic materials are of interest for their ready connection to theory, particularly in the context of quantum critical behavior. In this work we report detailed studies of the magnetic properties of a member of the rare earth pyrosilicate family, D-Er$_{2}$Si$_{2}$O$_{7}$, which is known to display a highly anisotropic Ising-like g-tensor and effective spin-1/2 magnetic moments. We used powder neutron diffraction, powder inelastic neutron spectroscopy (INS), and single crystal AC susceptibility to characterize its magnetic properties. Neutron diffraction enabled us to determine the magnetic structure below the known transition temperature ($T_{N}$ = 1.9 K) in zero field, confirming that the magnetic state is a four-sublattice antiferromagnetic structure with two non-collinear Ising axes, as was previously hypothesized. Our powder INS data revealed a gapped excitation at zero field, consistent with anisotropic (possibly Ising) exchange. An applied field of 1 T produces a mode softening, which is consistent with a field-induced second order phase transition. To assess the relevance of D-Er$_{2}$Si$_{2}$O$_{7}$ to the transverse field Ising model, we performed AC susceptibility measurements on a single crystal with the magnetic field oriented in the direction transverse to the Ising axes. This revealed a transition at 2.65 T at 0.1 K, a field significantly higher than the mode-softening field observed by powder INS, showing that the field-induced phase transitions are highly field-direction dependent as expected. These measurements suggest that D-Er$_{2}$Si$_{2}$O$_{7}$ may be a candidate for further exploration related to the transverse field Ising model.
