Superconductivity at 44.4 K achieved by intercalating EMIM+ into FeSe

doi:10.1088/1674-1056/ac1f09

中国物理B ›› 2021, Vol. 30 ›› Issue (10): 107402-107402.doi: 10.1088/1674-1056/ac1f09

Superconductivity at 44.4 K achieved by intercalating EMIM⁺ into FeSe

Jinhua Wang(王晋花), Qing Li(李庆), Wei Xie(谢威), Guanyu Chen(陈冠宇), Xiyu Zhu(祝熙宇)^†, and Hai-Hu Wen(闻海虎)

Center for Superconducting Physics and Materials, National Laboratory of Solid State Microstructures and Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

收稿日期:2021-07-12 修回日期:2021-08-11 接受日期:2021-08-19 出版日期:2021-09-17 发布日期:2021-09-26
通讯作者: Xiyu Zhu E-mail:zhuxiyu@nju.edu.cn;hhwen@nju.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12061131001 and 52072170) and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB25000000).

Superconductivity at 44.4 K achieved by intercalating EMIM⁺ into FeSe

Jinhua Wang(王晋花), Qing Li(李庆), Wei Xie(谢威), Guanyu Chen(陈冠宇), Xiyu Zhu(祝熙宇)^†, and Hai-Hu Wen(闻海虎)

Center for Superconducting Physics and Materials, National Laboratory of Solid State Microstructures and Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

Received:2021-07-12 Revised:2021-08-11 Accepted:2021-08-19 Online:2021-09-17 Published:2021-09-26
Contact: Xiyu Zhu E-mail:zhuxiyu@nju.edu.cn;hhwen@nju.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12061131001 and 52072170) and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB25000000).

摘要/Abstract

摘要： Superconductivity with transition temperature T_c above 40 K was observed in protonated FeSe (H_y-FeSe) previously with the ionic liquid EMIM-BF₄ used in the electrochemical process. However, the real superconducting phase is not clear until now. And detailed structural, magnetization, and electrical transport measurements are lacking. By using similar protonating technique on FeSe single crystals, we obtain superconducting samples with T_c above 40 K. We show that the obtained superconducting phase is not H_y-FeSe but actually an organic-ion (C₆H₁₁N₂⁺ referred to as EMIM⁺)-intercalated phase (EMIM)_xFeSe. By using x-ray diffraction technique, two sets of index peaks corresponding to different c-axis lattice constants are detected in the obtained samples, which belong to the newly formed phase of intercalated (EMIM)_xFeSe and the residual FeSe, respectively. The superconductivity of (EMIM)_xFeSe with T_c of 44.4 K is confirmed by resistivity and magnetic susceptibility measurements. Temperature dependence of resistivity with different applied magnetic fields reveals that the upper critical field H_c2 is quite high, while the irreversibility field H_irr is suppressed quickly with increasing temperature till about 20 K. This indicates that the resultant compound has a high anisotropy with a large spacing between the FeSe layers.

关键词: FeSe, iron-based superconductor, electrochemical intercalation

Abstract: Superconductivity with transition temperature T_c above 40 K was observed in protonated FeSe (H_y-FeSe) previously with the ionic liquid EMIM-BF₄ used in the electrochemical process. However, the real superconducting phase is not clear until now. And detailed structural, magnetization, and electrical transport measurements are lacking. By using similar protonating technique on FeSe single crystals, we obtain superconducting samples with T_c above 40 K. We show that the obtained superconducting phase is not H_y-FeSe but actually an organic-ion (C₆H₁₁N₂⁺ referred to as EMIM⁺)-intercalated phase (EMIM)_xFeSe. By using x-ray diffraction technique, two sets of index peaks corresponding to different c-axis lattice constants are detected in the obtained samples, which belong to the newly formed phase of intercalated (EMIM)_xFeSe and the residual FeSe, respectively. The superconductivity of (EMIM)_xFeSe with T_c of 44.4 K is confirmed by resistivity and magnetic susceptibility measurements. Temperature dependence of resistivity with different applied magnetic fields reveals that the upper critical field H_c2 is quite high, while the irreversibility field H_irr is suppressed quickly with increasing temperature till about 20 K. This indicates that the resultant compound has a high anisotropy with a large spacing between the FeSe layers.

Key words: FeSe, iron-based superconductor, electrochemical intercalation

中图分类号: (Pnictides and chalcogenides)

74.70.Xa

74.25.-q (Properties of superconductors) 74.72.Ek (Electron-doped) 82.45.Aa (Electrochemical synthesis)

Jinhua Wang(王晋花), Qing Li(李庆), Wei Xie(谢威), Guanyu Chen(陈冠宇), Xiyu Zhu(祝熙宇), and Hai-Hu Wen(闻海虎). Superconductivity at 44.4 K achieved by intercalating EMIM⁺ into FeSe[J]. 中国物理B, 2021, 30(10): 107402-107402.

Jinhua Wang(王晋花), Qing Li(李庆), Wei Xie(谢威), Guanyu Chen(陈冠宇), Xiyu Zhu(祝熙宇), and Hai-Hu Wen(闻海虎). Superconductivity at 44.4 K achieved by intercalating EMIM⁺ into FeSe[J]. Chin. Phys. B, 2021, 30(10): 107402-107402.

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Superconductivity at 44.4 K achieved by intercalating EMIM⁺ into FeSe

Superconductivity at 44.4 K achieved by intercalating EMIM⁺ into FeSe

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