High Quality Fe1+yTe Synthesized by Chemical Vapor Deposition with Conspicuous Vortex Flow

Author:

Lv Lu12,Hu Lihong3,Dong Weikang2,Duan Jingyi2,Wang Ping2,Li Peiling34,Qu Fanming345,Lu Li345,Ye Zimeng2,Zhao Junhao2,Li Jiafang2,Deng Fang2,Liu Guangtong345,Zhou Jiadong26ORCID,Gao Yanfeng17

Affiliation:

1. School of Materials Science and Engineering Shanghai University Shanghai 200444 China

2. Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics Beijing Institute of Technology Beijing 10081 China

3. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics Chinese Academy of Sciences Beijing 100190 China

4. Hefei National Laboratory Hefei 230088 China

5. Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China

6. Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing 10081 China

7. School of Chemical and Environmental Engineering Anhui Polytechnic University Wuhu Anhui 241000 China

Abstract

Abstract2D 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, the synthesis of high quality Fe1+yTe with tunable Fe content by chemical vapor deposition (CVD) is reported. 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 Fe1.13±0.06Te sample is sharp (ΔTc = 1 K), while Fe1.43±0.07Te with a high‐Fe content shows a relative broad superconducting transition (ΔTc = 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 Fe1.43±0.07Te sample. This work highlights the tunability of the superconducting properties of Fe1+yTe and sheds light on the vortex dynamics in Fe‐based superconductors, which facilitates them to understand the intrinsic mechanisms of high‐temperature superconductivity.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Beijing Municipality

National Science Fund for Distinguished Young Scholars

Publisher

Wiley

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