High quality Fe1+yTe synthesized by chemical vapor deposition with conspicuous vortex flow

Lu Lv; Lihong Hu; Weikang Dong; Jingyi Duan; Ping Wang; Peiling Li; Fanming Qu; Li Lu; Zimeng Ye; Junhao Zhao; Jiafang Li; Fang Deng; Guangtong Liu; Jiadong Zhou; Yanfeng Gao

doi:10.1002/adfm.202401748

arXiv · 2404.02420

High quality Fe1+yTe synthesized by chemical vapor deposition with conspicuous vortex flow

Lu Lv·Lihong Hu·Weikang Dong·Jingyi Duan·Ping Wang·Peiling Li·Fanming Qu·Li Lu·Zimeng Ye·Junhao Zhao·Jiafang Li·Fang Deng·Guangtong Liu·Jiadong Zhou·Yanfeng Gao

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Abstract

Two-dimensional (2D) materials provide an ideal platform to explore novel superconducting behavior including Ising superconductivity, topological superconductivity and Majorana bound states in different 2D stoichiometric Ta-, Nb-, and Fe-based crystals. However, tuning the element content in 2D compounds for regulating their superconductivity has not been realized. In this work, we report the synthesis of high quality Fe1+yTe with tunable Fe content by chemical vapor deposition (CVD). The quality and composition of Fe1+yTe are characterized by Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and scanning transmission electron microscopy (STEM). The superconducting behavior of Fe1+yTe crystals with varying Fe contents is observed. The superconducting transition of selected Fe1.13Te sample is sharp ({\Delta}Tc = 1 K), while Fe1.43Te with a high-Fe content shows a relative broad superconducting transition ({\Delta}Tc = 2.6 K) at zero magnetic field. Significantly, the conspicuous vortex flow and a transition from a 3D vortex liquid state to a 2D vortex liquid state is observed in Fe1.43Te sample. Our work highlights the tunability of the superconducting properties of Fe1+yTe and sheds light on the vortex dynamics in Fe-based superconductors, which facilitates us to understand the intrinsic mechanisms of high-temperature superconductivity.

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Lu Lv, Lihong Hu, Weikang Dong, Jingyi Duan, Ping Wang, Peiling Li, Fanming Qu, Li Lu, Zimeng Ye, Junhao Zhao, Jiafang Li, Fang Deng, Guangtong Liu, Jiadong Zhou, Yanfeng Gao. 2024-04-03. High quality Fe1+yTe synthesized by chemical vapor deposition with conspicuous vortex flow. https://doi.org/10.1002/adfm.202401748

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