V2Te2O: A Two-Dimensional van der Waals Correlated Metal

• Published in: Inorganic chemistry 2018-12, Vol.57 (23), p.14617-14623
• Main Authors: Ablimit, Abduweli, Sun, Yun-Lei, Cheng, Er-Jian, Liu, Ya-Bin, Wu, Si-Qi, Jiang, Hao, Ren, Zhi, Li, Shiyan, Cao, Guang-Han
• Format: Article
• Language: English
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/acs.inorgchem.8b02280

A metastable vanadium oxytelluride V2Te2O is prepared via a topochemical deintercalation of interlayer Rb+ cations in Rb1−δV2Te2O. The new ternary mixed-anion compound crystallizes in a body-centered tetragonal lattice with a = 3.9282(1) Å and c = 13.277(5) Å, containing V2O square nets that are sandwiched by Te-atomic sheets. The charge-neutral [V2OTe2] block layers stack along the c axis with van der Waals forces, which shows a metallic behavior with a dominant T 2 dependence for resistivity at low temperatures. The electronic specific-heat coefficient reaches 33.9 mJ K–2 mol–1, ∼4 times that of the electronic structure calculations, suggesting a significant electron-mass renormalization. The electron correlation effect is concurrently demonstrated by the Wilson and Kadowaki–Woods ratios. Neither charge/spin-density wave nor superconductivity was observed down to 0.03 K.