Robust superconductivity and transport properties in （Li1-xFex）OHFeSe single crystals

• Published in: 中国科学：物理学、力学、天文学英文版 2016 (5), p.11-15
• Main Author: Hai Lin Jie Xing XiYu Zhu Huan Yang Hai-Hu Wen
• Format: Article
• Language: English
• Subjects: X射线衍射; 临界态模型; 临界电流密度; 单晶体; 电输运性质; 电阻测量; 超导性; 超导电流密度
• ISSN: 1674-7348; 1869-1927

The recently discovered （Li1-xFex）OHFeSe superconductor with Tc about 40 K provides a good platform for investigating the magnetization and electrical transport properties of FeSe-based superconductors. By using a hydrothermal ion-exchange method, we have successfully grown crystals of （Li1-xFex）OHFeSe. X-ray diffraction on the sample shows the single crystalline PbO-type structure with the c-axis preferential orientation. Magnetic susceptibility and resistive measurements show an onset superconducting transition at around Tc=38.3 K. Using the magnetization hysteresis loops and Bean critical state model, a large critical current Js is observed in low temperature region. The critical current density is suppressed exponentially with increasing magnetic field. Temperature dependencies of resistivity under various currents and fields are measured, revealing a robust superconducting current density and bulk superconductivity.