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Detuning the Honeycomb of the α-RuCl3 Kitaev Lattice: A Case of Cr3+ Dopant
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2019-05-02 00:00:00 , DOI: 10.1021/acs.inorgchem.8b03545 Maria Roslova 1 , Jens Hunger 1 , Gaël Bastien 2 , Darius Pohl 2, 3 , Hossein M. Haghighi 2 , Anja U. B. Wolter 2 , Anna Isaeva 1 , Ulrich Schwarz 4 , Bernd Rellinghaus 3 , Kornelius Nielsch 2 , Bernd Büchner 2 , Thomas Doert 1
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2019-05-02 00:00:00 , DOI: 10.1021/acs.inorgchem.8b03545 Maria Roslova 1 , Jens Hunger 1 , Gaël Bastien 2 , Darius Pohl 2, 3 , Hossein M. Haghighi 2 , Anja U. B. Wolter 2 , Anna Isaeva 1 , Ulrich Schwarz 4 , Bernd Rellinghaus 3 , Kornelius Nielsch 2 , Bernd Büchner 2 , Thomas Doert 1
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Fine-tuning chemistry by doping with transition metals enables new perspectives for exploring Kitaev physics on a two-dimensional (2D) honeycomb lattice of α-RuCl3, which is promising in the field of quantum information protection and quantum computation. The key parameters to vary by doping are both Heisenberg and Kitaev components of the nearest-neighbor exchange interaction between the Jeff = 1/2 Ru3+ spins, depending strongly on the peculiarities of the crystal structure. Here, we present crystal growth by chemical vapor transport and structure elucidation of a solid solution series Ru1–xCrxCl3 (0 ≤ x ≤ 1), with Cr3+ ions coupled to the Ru3+ Kitaev host. The Cr3+ substitution preserves the honeycomb type lattice of α-RuCl3 and creates mixed occupancy of Ru/Cr sites without cationic order within the layers as confirmed by single-crystal X-ray diffraction and transmission electron microscopy investigations. In contrast to high-quality single crystals of α-RuCl3 with ABAB-stacked layers, the ternary compounds demonstrate a significant stacking disorder along the c-axis direction as evidenced by X-ray diffraction and high resolution scanning transmission electron microscopy (HR-STEM). Raman spectra of substituted samples are in line with the symmetry conservation of the parent lattice upon chromium doping. At the same time, our magnetic susceptibility data indicate that the Kitaev physics of α-RuCl3 is increasingly suppressed by the dominant spin-only driven magnetism of Cr3+ (S = 3/2) in Ru1–xCrxCl3.
中文翻译：
失谐的α的RuCl的蜂窝3 Kitaev格：铬为例3+掺杂
通过用过渡金属掺杂微调化学使新的前景上的二维（2D）探索Kitaev物理α-的RuCl的蜂窝状格子3，这是在量子信息保护和量子计算的领域有前途的。关键参数通过掺杂来改变都是之间的最近邻居交换相互作用的两个海森堡和Kitaev部件Ĵ EFF = 1 / 2的Ru 3+旋转时，对晶体结构的特殊性强烈依赖。在这里，我们介绍了通过化学气相传输和晶体阐明的固溶体系列Ru 1– x Cr x Cl 3（0≤x≤1），且Cr 3+离子与Ru 3+ Kitaev主体偶联。将Cr 3+取代蜜饯α-的RuCl的蜂窝型晶格3和没有由单晶X射线衍射和透射电子显微镜调查证实了层内的阳离子顺序创建的Ru / Cr的位点的混合占用。相比于α-的RuCl的高品质的单晶3与ABAB-堆叠的层，所述三元化合物证明沿一个显著堆叠病症ÇX射线衍射和高分辨率扫描透射电子显微镜（HR-STEM）证明了X轴方向。取代样品的拉曼光谱与铬掺杂时母体晶格的对称守恒一致。同时，我们的磁化率的数据表明，α-的RuCl的Kitaev物理3日益受到主导旋仅驱动的Cr磁性抑制3+（小号= 3 / 2中的Ru）1- X的Cr X氯3。
更新日期：2019-05-02
中文翻译：
失谐的α的RuCl的蜂窝3 Kitaev格：铬为例3+掺杂
通过用过渡金属掺杂微调化学使新的前景上的二维（2D）探索Kitaev物理α-的RuCl的蜂窝状格子3，这是在量子信息保护和量子计算的领域有前途的。关键参数通过掺杂来改变都是之间的最近邻居交换相互作用的两个海森堡和Kitaev部件Ĵ EFF = 1 / 2的Ru 3+旋转时，对晶体结构的特殊性强烈依赖。在这里，我们介绍了通过化学气相传输和晶体阐明的固溶体系列Ru 1– x Cr x Cl 3（0≤x≤1），且Cr 3+离子与Ru 3+ Kitaev主体偶联。将Cr 3+取代蜜饯α-的RuCl的蜂窝型晶格3和没有由单晶X射线衍射和透射电子显微镜调查证实了层内的阳离子顺序创建的Ru / Cr的位点的混合占用。相比于α-的RuCl的高品质的单晶3与ABAB-堆叠的层，所述三元化合物证明沿一个显著堆叠病症ÇX射线衍射和高分辨率扫描透射电子显微镜（HR-STEM）证明了X轴方向。取代样品的拉曼光谱与铬掺杂时母体晶格的对称守恒一致。同时，我们的磁化率的数据表明，α-的RuCl的Kitaev物理3日益受到主导旋仅驱动的Cr磁性抑制3+（小号= 3 / 2中的Ru）1- X的Cr X氯3。
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