标题： 准一维碲化物Fe$_{4-x}$VTe$_{4-y}$ ($x=1.01$, $y=0.74$) 和 V$_{4.64}$Te$_4$的晶体生长、结构和物理性质 显示英文标题

标题： Crystal growth, structure and physical properties of quasi-one-dimensional tellurides Fe$_{4-x}$VTe$_{4-y}$ ($x=1.01$, $y=0.74$) and V$_{4.64}$Te$_4$

摘要： 一种具有Ti5Te4型结构的新三元化合物Fe$_{4-x}$VTe$_{4-y}$ ($x=1.01$, $y=0.74$)被确认。 Fe和V原子倾向于占据不同的晶体学位置并沿c轴形成准一维（准-1D）的Fe-V链。 通过化学气相传输法可以生长出细长棒状的毫米级单晶Fe$_{2.99}$VTe$_{3.26}$ (FVT)，这反映了其准一维晶体结构。 磁化测量显示，FVT在T$_N$=93 K以下反铁磁有序，并具有强烈的易ab面磁各向异性。 尽管在10 K以下出现了一种弱的玻璃态行为，但FVT在长程反铁磁有序的主导下，与之前报道的同结构Fe$_{5}$Te$_{4}$中的自旋玻璃态形成对比。 我们还合成了V$_{4.64}$Te$_4$，其具有类似的准一维V链，并发现其电阻率和磁化率曲线在144 K处有弱异常。 然而，未发现磁序或电荷序发展的明确证据。 X射线光电子能谱和居里-韦斯拟合表明，两种化合物中Fe$^{2+}$和V$^{4+}$的有效磁矩与传统的局域磁矩模型有较大偏差，这可能源于Fe/V金属-金属键的形成。 此外，FVT 和 V$_{4.64}$Te$_4$的电阻率表现出类似半导体的温度依赖行为，但平均值接近典型不良金属，这类似于铁基超导体正常态中的输运行为。 这些准一维化合物为未来的凝聚态物理研究展示了有趣的物理性质。 显示英文摘要

摘要： A new ternary compound Fe$_{4-x}$VTe$_{4-y}$ ($x=1.01$, $y=0.74$) with Ti5Te4-type structure is identified. Fe and V atoms tend to occupy different crystallographic positions and form quasi-one-dimensional (quasi-1D) Fe-V chains along the c-axis. Millimeter-sized single crystal of Fe$_{2.99}$VTe$_{3.26}$ (FVT) with slender-stick shape could be grown by chemical vapor transport method which reflects its quasi-1D crystal structure. Magnetization measurements reveal that FVT orders antiferromagnetically below T$_N$=93 K with strong easy ab-plane magnetic anisotropy. Although a weak glassy-like behavior appears below 10 K, FVT is dominant by long-range antiferromagnetic order in contrast to the spin-glass state in previously reported isostructural Fe$_{5}$Te$_{4}$. We also synthesize V$_{4.64}$Te$_4$ with similar quasi-1D V-chains and find it has weak anomalies at 144 K on both resistivity and susceptibility curves. However, no clear evidence is found for the development of magnetic or charge order. X-ray photoelectron spectroscopy and Curie-Weiss fit reveal that the effective moments for Fe$^{2+}$ and V$^{4+}$ in both compounds have large deviations from the conventional local moment model, which may possibly result from the formation of Fe/V metal-metal bondings. Furthermore the resistivity of both FVT and V$_{4.64}$Te$_4$ exhibits semiconducting-like temperature-dependent behavior but with average values close to typical bad metals, which resembles the transport behavior in the normal state of Fe-based superconductors. These quasi-1D compounds have shown interesting physical properties for future condensed matter physics research.