The Crystal Structure and Superconducting Property of (Li0.8Fe0.2)OHFeSe1-xTex

• Published in: Journal of superconductivity and novel magnetism Vol. 35; no. 9; pp. 2319 - 2325
• Main Authors: Luo, Siyu, Wu, Yuxian, Wen, Zhiwei, Cui, Yajing, Zhao, Yong, Chen, Yongliang
• Format: Journal Article
• Language: English
• Published: New York Springer US 20.04.2022
• Subjects: Characterization and Evaluation of Materials; Condensed Matter Physics; Magnetic Materials; Magnetism; Original Paper; Physics; Physics and Astronomy; Strongly Correlated Systems; Superconductivity; Superconductivity; Hydrothermal ion-exchange method; OHFeSe; Li; FeSe-based superconductors; Fe; Crystal structure
• ISSN: 1557-1939; 1557-1947
• DOI: 10.1007/s10948-022-06256-y

(Li 0.8 Fe 0.2 )OHFeSe is a superconductor with high superconducting transition temperature (43 K) and stable in air, which is conducive to most measurements and has attracted wide attention. Here, a series of (Li 0.8 Fe 0.2 )OHFeSe 1- x Te x single crystals with x  = 0 ~ 0.15 was synthesized by hydrothermal ion-exchange method and its crystal structure and superconductivity were investigated. The substitution of Te for Se only resulted in monotonic increase of lattice parameters a with the increase of Te doping content, while other structural parameters show abnormal evolutionary processes. Te doping suppressed the superconductivity of (Li 0.8 Fe 0.2 )OHFeSe. A positive correlation between superconducting transition temperature and lattice parameter c was observed in current (Li 0.8 Fe 0.2 )OHFeSe 1- x Te x system, indicating that large interlayer distance is essential for enhancement of the superconductivity in FeSe-derived superconductors.