| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Superconducting (Li,Fe)OHFeSe Film of High Quality and High Critical Parameters |
| Yulong Huang1,2†, Zhongpei Feng1,2†, Shunli Ni1,2†, Jun Li4, Wei Hu1,2, Shaobo Liu1,2, Yiyuan Mao1,2, Huaxue Zhou1, Fang Zhou1,2, Kui Jin1,2,3**, Huabing Wang4, Jie Yuan1,3**, Xiaoli Dong1,2,3**, Zhongxian Zhao1,2,3** |
1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190
2University of Chinese Academy of Sciences, Beijing 100049
3Key Laboratory for Vacuum Physics, University of Chinese Academy of Sciences, Beijing 100049
4Research Institute of Superconductor Electronics, Nanjing University, Nanjing 210093
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| Cite this article: |
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Yulong Huang, Zhongpei Feng, Shunli Ni et al 2017 Chin. Phys. Lett. 34 077404 |
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Abstract A superconducting film of (Li$_{1-x}$Fe$_{x})$OHFeSe is reported for the first time. The thin film exhibits a small in-plane crystal mosaic of 0.22$^{\circ}$, in terms of the full width at half maximum of the x-ray rocking curve, and an excellent out-of-plane orientation by x-ray $\varphi $-scan. Its bulk superconducting transition temperature $T_{\rm c}$ of 42.4 K is characterized by both zero electrical resistance and diamagnetization measurements. The upper critical field $H_{\rm c2}$ is estimated to be 79.5 T and 443 T for the magnetic field perpendicular and parallel to the $ab$ plane, respectively. Moreover, a large critical current density $J_{\rm c}$ of a value over 0.5 MA/cm$^{2}$ is achieved at $\sim $20 K. Such a (Li$_{1-x}$Fe$_{x})$OHFeSe film is therefore not only important to the fundamental research for understanding the high-$T_{\rm c}$ mechanism, but also promising in the field of high-$T_{\rm c}$ superconductivity application, especially in high-performance electronic devices and large scientific facilities such as superconducting accelerator.
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Received: 22 June 2017
Published: 23 June 2017
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| PACS: |
74.78.-w
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(Superconducting films and low-dimensional structures)
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74.25.Op
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(Mixed states, critical fields, and surface sheaths)
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74.25.Sv
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(Critical currents)
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| Fund: Supported by the National Basic Research Program of China under Grant No 2017YFA0303000, the National Natural Science Foundation of China under Grant Nos 11574370, 11234006 and 61501220, the Strategic Priority Research Program and Key Research Program of Frontier Sciences of the Chinese Academy of Sciences under Grant Nos QYZDY-SSW-SLH001, QYZDY-SSW-SLH008 and XDB07020100. |
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