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题名: Controllable Phase Transition for Layered beta-FeSe Superconductor Synthesized by Solution Chemistry
作者: Li, Da;  Pan, Desheng;  Liu, Weilai;  Li, Xiaoxi;  Chen, Maolin;  Li, Shaojie;  Li, Yong;  Tan, Jun;  Sun, Dongming;  Wang, Zhenhua;  Han, Zheng;  Zhang, Zhidong
发表日期: 2017-1-24
摘要: Low-temperature synthesis of beta-FeSe superconductor from soluble precursors is a great challenge in the chemical solution approaches. Here, we develop a new and facile solution-based synthetic route to first fabricate narrow-phased beta-FeSe superconductor with soluble iron and selenium sources as starting materials. The growth mechanism of beta-FeSe superconductors is discussed by kinetically controllable syntheses in various reaction conditions. Chemically engineering the stoichiometry of beta-FeSe products by selenium-diffusion process gives rise to a transition of antiferromagnetic-superconducting-antiferromagnetic (AFM-SC-AFM) order. Once the AFM order is suppressed, SC beta-FeSe nanosheets show a tunable initial superconducting transition temperature (T-C) from 3.2 to 10 K in the superconducting regime. Electrical measurements on superconducting beta-FeSe exhibit an upper critical magnetic field higher than 14 T, showing potential application of beta-FeSe nanosheet for superconducting device. This method provides guidance for future applications in such chemical solutions for diffusion controlled synthesis of narrow-phased functional materials, which are enriched of abundant fundamental physics and potentials for future applications.
刊名: CHEMISTRY OF MATERIALS
Appears in Collections:中国科学院金属研究所_期刊论文

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Recommended Citation:
Li, Da,Pan, Desheng,Liu, Weilai,et al. Controllable Phase Transition For Layered Beta-fese Superconductor Synthesized By Solution Chemistry[J]. Chemistry Of Materials,2017,29(2):842-848.

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