Robust superconductivity and transport properties in (Li-1-Fe-x(x)) OHFeSe single crystals
Robust superconductivity and transport properties in (Li-1-Fe-x(x)) OHFeSe single crystals
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(Li-1-Fe-x(x)) OHFeSe 单晶具有鲁棒的超导性和输运特性
DOI：
10.1007/s11433-016-5782-z
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Hai-Hu Wen
中科院分区：
文献类型：
--
作者：
Hai Lin;Jie Xing;Xiyu Zhu;Huan Yang;Hai-Hu Wen
最近发现的Tc约为40 K的（Li 1-xFex）OHFeSe超导体为研究FeSe基超导体的磁化和电输运性质提供了一个很好的平台。采用水热离子交换法成功地生长出了（Li_（1-x）Fe_x）OHFeSe晶体。X射线衍射分析表明，样品为PbO型单晶结构，具有c轴择优取向。磁化率和电阻测量表明，超导转变的开始在Tc= 38.3 K左右。利用磁滞回线和Bean临界态模型，在低温区观察到一个大的临界电流Js。临界电流密度随磁场的增加呈指数规律地降低。测量了不同电流和磁场下电阻率的温度依赖性，揭示了强大的超导电流密度和体超导性。
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.