Modulation effect of interlayer spacing on the superconductivity of electron-doped FeSe-based intercalates

Inorganic Chemistry
Fumitaka HayashiHideo Hosono

Abstract

FeSe-based intercalates are regarded as promising candidates for high-critical temperature (Tc) superconductors. Here we present new Na- and Sr-intercalated FeSe superconductors with embedded linear diamines (H2N)CnH2n(NH2) (abbreviated as DA; n = 0, 2, 3, or 6) prepared using a low-temperature ammonothermal method to investigate the effect of interlayer spacing on the superconductivity of electron-doped FeSes. The embedded DA formed a monolayer or bilayer in the interlayer of FeSe. The interlayer spacing between nearest FeSe layers could be tuned from 0.87 to 1.14 nm without significant change in the Na/Sr content or the ratio of Fe to Se. Importantly, bilayer phases Na/ethylenediamine- and Sr/hydrazine-FeSe show improved structural stability compared to that of Na/NH3-FeSe. The series of Na- and Sr-intercalated FeSe samples exhibited nearly the same high Tc values of 41-46 and 34-38 K, respectively, irrespective of rather different interlayer spacing d. The peculiar insensitivity for both series can be ascribed to the negligible dispersions of bands along the c axis; i.e., Fermi surfaces are nearly two-dimensional when d is larger than a certain threshold value (dsat) of ∼0.9 nm. The Fermi surface shape is already optimal for...Continue Reading

References

Feb 26, 2008·Journal of the American Chemical Society·Yoichi KamiharaHideo Hosono
Sep 9, 2008·Proceedings of the National Academy of Sciences of the United States of America·Fong-Chi HsuMaw-Kuen Wu
Oct 10, 2008·Journal of the American Chemical Society·Satoru MatsuishiHideo Hosono
Oct 15, 2008·Physical Review Letters·Marianne RotterDirk Johrendt
Nov 26, 2008·Chemical Communications : Chem Comm·Michael J PitcherSimon J Clarke
Jul 12, 2012·Nature Communications·Soshi IimuraHideo Hosono
Jul 25, 2012·Journal of the American Chemical Society·Yun-Lei SunGuang-Han Cao
Feb 15, 2013·Journal of the American Chemical Society·Tianping YingWanyan Wang
Aug 13, 2014·Scientific Reports·Yi SunJian Wang
Aug 27, 2014·Nature Communications·Jiangang GuoHideo Hosono

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Citations

Feb 15, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·J StahlD Johrendt
Sep 12, 2020·Physical Review Letters·B L KangX H Chen

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