The recently discovered (Li1−xFex)OHFeSe superconductor with Tc about 40K 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=38.3K. 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.
@article{arxiv.1601.04903,
title = {Robust superconductivity and transport properties in (Li1-xFex)OHFeSe single crystals},
author = {Hai Lin and Jie Xing and Xiyu Zhu and Huan Yang and Hai-Hu Wen},
journal= {arXiv preprint arXiv:1601.04903},
year = {2016}
}