Single crystal growth and nano-structure study in a topological dirac metal, CoTe2-δ

Lei Chen, Weiyao Zhao, Ren-Kui Zheng

Research output: Contribution to journalArticleResearchpeer-review


A single crystal of a topological material, CoTe2-δ, has been grown via the chemical vapor transport method for a structural and electronic transport study. Single-crystal X-ray diffraction, powder X-ray diffraction, and high-resolution scanning electron microscope measurements confirm the high quality of the as-grown single crystals. In a high-resolution scanning electron microscopy study, a clear layered feature of the trigonal CoTe2-δ crystal was observed. Fractal features and mosaic-type nanostructures were observed on the as-grown surface and cleaved surface, respectively. The trigonal CoTe2-δ demonstrates a metallic ground state in transport measurements, with a typical carrier’s concentration in a 1021 cm−3 magnitude and a residual resistivity ratio of 1.6. Below 10 K, trigonal CoTe2-δ contains quite complicated magnetoresistance behavior as a result of the competing effect between Dirac states and possible spin fluctuations.

Original languageEnglish
Article number46
Number of pages12
Issue number1
Publication statusPublished - 2024


  • 2D material
  • nanostructures
  • single crystal
  • topological material

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