Abstract
The recently discovered (Li1-x Fe x )OHFeSe superconductor with T c 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-x Fe x )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 T c =38.3 K. Using the magnetization hysteresis loops and Bean critical state model, a large critical current J s 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.
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Lin, H., Xing, J., Zhu, X. et al. Robust superconductivity and transport properties in (Li1-x Fe x )OHFeSe single crystals. Sci. China Phys. Mech. Astron. 59, 657404 (2016). https://doi.org/10.1007/s11433-016-5782-z
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DOI: https://doi.org/10.1007/s11433-016-5782-z