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Chin. Phys. B, 2018, Vol. 27(7): 077405    DOI: 10.1088/1674-1056/27/7/077405
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Effect of Mn substitution on superconductivity in iron selenide (Li, Fe)OHFeSe single crystals

Yiyuan Mao(毛义元)1,2, Zian Li(李子安)1,2, Huaxue Zhou(周花雪)1, Mingwei Ma(马明伟)1,2, Ke Chai(柴可)3, Shunli Ni(倪顺利)1,2, Shaobo Liu(刘少博)1,2, Jinpeng Tian(田金鹏)1,2, Yulong Huang(黄裕龙)1,2, Jie Yuan(袁洁)1, Fang Zhou(周放)1,2, Jianqi Li(李建奇)1,2, Kui Jin(金魁)1,2, Xiaoli Dong(董晓莉)1,2, Zhongxian Zhao(赵忠贤)1,2
1 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Science, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 School of Physic, Beijing Institute of Technology, Beijing 100081, China
Abstract  

We synthesize a series of Mn substituted (Li, Fe)OHFeSe superconductor single crystals via a modified ion-exchange method, with the Mn concentration z (the atomic ratio of Mn:Se) ranging from 0 to 0.07. The distribution homogeneity of the Mn element incorporated into the lattice of (Li, Fe)OHFeSe is checked by combined measurements of high-angle-annular-dark-field (HAADF) imaging and electron energy-loss spectroscopy (EELS). Interestingly, we find that the superconducting transition temperature Tc and unit cell parameter c of the Mn-doped (Li, Fe)OHFeSe samples display similar V-shaped evolutions with the increasing dopant concentration z. We propose that, with increasing doping level, the Mn dopant first occupies the tetrahedral sites in the (Li, Fe)OH layers before starting to substitute the Fe element in the superconducting FeSe layers, which accounts for the V-shaped change in cell parameter c. The observed positive correlation between the Tc and lattice parameter c, regardless of the Mn doping level z, indicates that a larger interlayer separation, or a weaker interlayer coupling, is essential for the high-Tc superconductivity in (Li, Fe)OHFeSe. This agrees with our previous observations on powder, single crystal, and film samples of (Li, Fe)OHFeSe superconductors.

Keywords:  FeSe-based superconductors      Mn doping effect      correlation between superconductivity and interlayer separation  
Received:  11 May 2018      Revised:  15 May 2018      Accepted manuscript online: 
PACS:  74.70.Xa (Pnictides and chalcogenides)  
  82.30.Hk (Chemical exchanges (substitution, atom transfer, abstraction, disproportionation, and group exchange))  
  74.25.-q (Properties of superconductors)  
Fund: 

Project supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0303003 and 2016YFA0300300), the National Natural Science Foundation of China (Grant No. 11574370), and the Strategic Priority Research Program and Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (Grant Nos. QYZDY-SSW-SLH001, QYZDY-SSW-SLH008, and XDB07020100).{These authors contributed equally to this work.

Corresponding Authors:  Xiaoli Dong, Zhongxian Zhao     E-mail:  dong@iph.ac.cn;zhxzhao@iphy.ac.cn

Cite this article: 

Yiyuan Mao(毛义元), Zian Li(李子安), Huaxue Zhou(周花雪), Mingwei Ma(马明伟), Ke Chai(柴可), Shunli Ni(倪顺利), Shaobo Liu(刘少博), Jinpeng Tian(田金鹏), Yulong Huang(黄裕龙), Jie Yuan(袁洁), Fang Zhou(周放), Jianqi Li(李建奇), Kui Jin(金魁), Xiaoli Dong(董晓莉), Zhongxian Zhao(赵忠贤) Effect of Mn substitution on superconductivity in iron selenide (Li, Fe)OHFeSe single crystals 2018 Chin. Phys. B 27 077405

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[1] Doping Mn into (Li1-xFex)OHFe1-ySe superconducting crystals via ion-exchange and ion-release/introduction syntheses
Huaxue Zhou(周花雪), Shunli Ni(倪顺利), Jie Yuan(袁洁), Jun Li(李军), Zhongpei Feng(冯中沛), Xingyu Jiang(江星宇), Yulong Huang(黄裕龙), Shaobo Liu(刘少博), Yiyuan Mao(毛义元), Fang Zhou(周放), Kui Jin(金魁), Xiaoli Dong(董晓莉), Zhongxian Zhao(赵忠贤). Chin. Phys. B, 2017, 26(5): 057402.
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