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arXiv · 2504.12630

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$_4$

S. N. Sun·D. Y. Xu·C. L. Shang·B. X. Shi·J. L. Huang·X. J. Gui·Z. C. Sun·J. J. Liu·J. C. Wang·H. X. Zhang·P. Cheng
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Abstract

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.

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S. N. Sun, D. Y. Xu, C. L. Shang, B. X. Shi, J. L. Huang, X. J. Gui, Z. C. Sun, J. J. Liu, J. C. Wang, H. X. Zhang, P. Cheng. 2025-04-17. 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$_4$. https://arxiv.org/abs/2504.12630

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