6R-NbSeTe中1T-1H层的自堆叠及配体无序引起的电荷与磁关联的出现
Self-stacked 1$\mathrm{T}$-1$\mathrm{H}$ layers in 6$\mathrm{R}$-NbSeTe and the emergence of charge and magnetic correlations due to ligand disorder
AI总结：
该研究在NbSeTe中合成新型自堆叠6R相，发现配体无序抑制电荷密度波并诱导短程电荷与磁关联，为研究物质新相提供途径。
摘要：
1T和1H范德华层结合所产生的关联现象是深入研究的焦点。在此，我们在NbSeTe中合成了一种新型自堆叠6R相，扫描透射电子显微镜显示其具有沿c方向共格生长的完美交替1T和1H层。角分辨光电子能谱表明，三角和八面体Nb能带对费米能级有混合贡献。漫散射揭示了传播向量为q_CO=(0.25,0)的温度无关短程电荷涨落，这源于1T层中纵模的凝聚。我们观察到配体无序抑制了电荷密度波的形成。磁化测量表明存在不均匀的短程磁有序，比热中无明显相转变的缺失进一步支持了这一点。这些实验分析与ab initio计算结合表明，6R-NbSeTe的基态由配体无序驱动的短程电荷调制和自旋关联区域的统计分布描述。我们的结果设计了一条合成1T-1H自堆叠体异质结以研究物质新相的途径。
英文摘要：
The emergence of correlated phenomena arising from the combination of 1$\mathrm{T}$ and 1$\mathrm{H}$ van der Waals layers is the focus of intense research. Here, we synthesize a novel self-stacked 6$\mathrm{R}$ phase in NbSeTe, showing a perfect alternating 1T and 1H layers that grow coherently along the c-direction, as revealed by scanning transmission electron microscopy. Angle resolved photoemission spectroscopy shows a mixed contribution of the trigonal and octahedral Nb bands to the Fermi level. Diffuse scattering reveals temperature-independent short-range charge fluctuations with propagation vector $\mathrm{q_{CO}}$=(0.25,0), derived from the condensation of a longitudinal mode in the 1T layer. We observe that ligand disorder quenches the formation of a charge density wave. Magnetization measurements suggest the presence of an inhomogeneous, short-range magnetic order, further supported by the absence of a clear phase transition in the specific heat. These experimental analyses in combination with \textit{ab initio} calculations indicate that the ground state of 6$\mathrm{R}$-NbSeTe is described by a statistical distribution of short-range charge-modulated and spin-correlated regions driven by ligand disorder. Our results devise a route to synthesize 1$\mathrm{T}$-1$\mathrm{H}$ self-stacked bulk heterostructures to study emergent phases of matter.
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