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Open AccessReview

Highly-Tunable Crystal Structure and Physical Properties in FeSe-Based Superconductors

1
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(11), 560; https://doi.org/10.3390/cryst9110560
Received: 12 September 2019 / Revised: 21 October 2019 / Accepted: 22 October 2019 / Published: 25 October 2019
(This article belongs to the Special Issue Synthesis and Characterization of New Superconductors Materials)
Here, crystal structure, electronic structure, chemical substitution, pressure-dependent superconductivity, and thickness-dependent properties in FeSe-based superconductors are systemically reviewed. First, the superconductivity versus chemical substitution is reviewed, where the doping at Fe or Se sites induces different effects on the superconducting critical temperature (Tc). Meanwhile, the application of high pressure is extremely effective in enhancing Tc and simultaneously induces magnetism. Second, the intercalated-FeSe superconductors exhibit higher Tc from 30 to 46 K. Such an enhancement is mainly caused by the charge transfer from the intercalated organic and inorganic layer. Finally, the highest Tc emerging in single-unit-cell FeSe on the SrTiO3 substrate is discussed, where electron-phonon coupling between FeSe and the substrate could enhance Tc to as high as 65 K or 100 K. The step-wise increment of Tc indicates that the synergic effect of carrier doping and electron-phonon coupling plays a critical role in tuning the electronic structure and superconductivity in FeSe-based superconductors. View Full-Text
Keywords: FeSe; superconductivity; high pressure; chemical intercalation; interfacial coupling FeSe; superconductivity; high pressure; chemical intercalation; interfacial coupling
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MDPI and ACS Style

Zhou, K.; Wang, J.; Song, Y.; Guo, L.; Guo, J.-g. Highly-Tunable Crystal Structure and Physical Properties in FeSe-Based Superconductors. Crystals 2019, 9, 560. https://doi.org/10.3390/cryst9110560

AMA Style

Zhou K, Wang J, Song Y, Guo L, Guo J-g. Highly-Tunable Crystal Structure and Physical Properties in FeSe-Based Superconductors. Crystals. 2019; 9(11):560. https://doi.org/10.3390/cryst9110560

Chicago/Turabian Style

Zhou, Kaiyao; Wang, Junjie; Song, Yanpeng; Guo, Liwei; Guo, Jian-gang. 2019. "Highly-Tunable Crystal Structure and Physical Properties in FeSe-Based Superconductors" Crystals 9, no. 11: 560. https://doi.org/10.3390/cryst9110560

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