非化学计量Nd ${}_2$ NiO ${}_{4.10}$中长程氧和磁有序的相互依赖标度
Interdependent scaling of long-range oxygen and magnetic ordering in non-stoichiometric Nd${}_2$NiO${}_{4.10}$
摘要：
Nd ${}_{2}$ NiO ${}_{4.00}$中的空穴掺杂可以通过用二价碱土金属取代三价Nd原子或通过氧掺杂来实现，产生Nd ${}_{2}$ NiO ${}_{4+δ}$。在这项研究中，我们研究了氧和自旋有序的低氧掺杂浓度，即Nd ${}_{2}$ NiO ${}_{4.10}$之间的相互作用。尽管额外的氧掺杂水平保持相当适度，20个可能的间隙四面体晶格位点中仅一个被占据，但是我们通过单晶中子衍射观察到与已经在环境下的氧排序相关的复杂3D调制结构的存在，调制矢量是$\pm$ 2/13 \textit{\textbf{a*}} $\pm$ 3/13 \textit{\textbf{b*}}，$\pm$ 3/13 \textit{\textbf{b*}} $\pm$ 2/13 \textit{\textbf{b*}}和$\pm$ 1/5 \textit{\textbf{a*}} $\pm$ 1/2 \textit{\textbf{c*}}和卫星反射高达四阶。随温度变化的中子衍射研究表明，氧和磁有序T ${}_{N}$ $\simeq$ 48 K以下的共存，Ni亚晶格的波矢为\textbf{\textit{k}} =（100）。此外，磁卫星反射适应完全相同的调制矢量发现的氧有序，证明了一个独特的共存的三维调制有序的自旋和氧有序的Nd ${}_{2}$ NiO ${}_{4.10}$。温度依赖的测量磁场强度表明两个磁相变低于48 K和20 K，表示两个不同的起始磁有序的Ni和Nd的亚晶格，分别。
英文摘要：
Hole doping in Nd${}_{2}$NiO${}_{4.00}$ can be either achieved by substituting the trivalent Nd atoms by bivalent alkaline earth metals or by oxygen doping, yielding Nd${}_{2}$NiO${}_{4+δ}$. In this study, we investigated the interplay between oxygen and spin ordering for a low oxygen doping concentration i.e. Nd${}_{2}$NiO${}_{4.10}$. Although the extra oxygen doping level remains rather modest with only one out of 20 possible interstitial tetrahedral lattice sites occupied, we observed by single crystal neutron diffraction the presence of a complex 3D modulated structure related to oxygen ordering already at ambient, the modulation vectors being $\pm$2/13\textit{\textbf{a*}}$\pm$3/13\textit{\textbf{b*}}, $\pm$3/13\textit{\textbf{b*}}$\pm$2/13\textit{\textbf{b*}} and $\pm$1/5\textit{\textbf{a*}}$\pm$1/2\textit{\textbf{c*}} and satellite reflections up to fourth order. Temperature dependent neutron diffraction studies indicate the coexistence of oxygen and magnetic ordering below T${}_{N}$ $\simeq$ 48 K, the wave vector of the Ni sublattice being \textbf{\textit{k}}=(100). In addition, magnetic satellite reflections adapt exactly the same modulation vectors as found for the oxygen ordering, evidencing a unique coexistence of 3D modulated ordering for spin and oxygen ordering in Nd${}_{2}$NiO${}_{4.10}$. Temperature dependent measurements of magnetic intensities suggest two magnetic phase transitions below 48 K and 20 K, indicating two distinct onsets of magnetic ordering for the Ni and Nd sublattice, respectively.
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