Controllable Phase Transition for Layered β-FeSe Superconductor Synthesized by Solution Chemistry

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• 作者：Da LiDesheng Pan ; Weilai Liu ; Xiaoxi Li ; Maolin Chen ; Shaojie Li ; Yong Li ; Jun Tan ; Dongming Sun ; Zhenhua Wang ; Zheng HanZhidong Zhang
• 刊名：Chemistry of Materials
• 出版年：2017
• 出版时间：January 24, 2017
• 年：2017
• 卷：29
• 期：2
• 页码：842-848
• 全文大小：444K
• ISSN：1520-5002

文摘

Low-temperature synthesis of β-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 β-FeSe superconductor with soluble iron and selenium sources as starting materials. The growth mechanism of β-FeSe superconductors is discussed by kinetically controllable syntheses in various reaction conditions. Chemically engineering the stoichiometry of β-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 β-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 β-FeSe exhibit an upper critical magnetic field higher than 14 T, showing potential application of β-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.