Synthesis and electronic structure of van der Waals layered Cu1.1Fe1.2Te2 with a spin-density-wave behavior.

Recent research has demonstrated that the CuFeTe₂ compound has interesting physical properties. However, less research effort has been afforded to the study of the stable non-stoichiometric Cu_1.1Fe_1.2Te₂ structure and electronic properties. In this paper, we report the synthesis and electronic properties of the non-stoichiometric (Cu, Fe) co-doped CuFeTe₂ (Cu_1.1Fe_1.2Te₂) with a stable single phase. The temperature-dependent resistance and magnetic susceptibility measurements showed an obvious phase transition from a semiconductor to metal when the temperature reached 360 K, revealing a spin-density-wave (SDW)-like state existing in the as-grown Cu_1.1Fe_1.2Te₂, which has a higher SDW transition temperature than that of CuFeTe₂. Interestingly, a spectral weight evolution of the angle-resolved photoemission spectroscopy in the study of the electronic structure of Cu_1.1Fe_1.2Te₂ is observed at the same temperature of 360 K. Our work provides a scheme for exploration of novel physical phenomena related to SDW in two-dimensional materials. [ABSTRACT FROM AUTHOR]