Superconductivity in the iron selenide KxFe2Se2 (0 <= x <= 1)
Jiangang Guo, Shifeng Jin, Gang Wang, Shunchong Wang, Kaixing Zhu,, Tingting Zhou, Meng He, Xiaolong Chen
TL;DR
This paper reports the discovery of superconductivity above 30 K in a new iron selenide compound K0.8Fe2Se2, achieved through metal intercalation, highlighting its potential as a high-temperature superconductor among FeSe-layer materials.
Contribution
The study introduces a new FeSe-layer superconductor with record Tc under ambient pressure, achieved by K intercalation, and confirms its superconductivity is intrinsic to this phase.
Findings
Superconductivity above 30 K in K0.8Fe2Se2.
Electron-dominated charge carriers in the superconductor.
Superconductivity is due to the new FeSe-based 122 phase.
Abstract
We report the superconductivity at above 30 K in a new FeSe-layer compound K0.8Fe2Se2 (nominal composition) achieved by metal K intercalating in between FeSe layers. It is isostructural to BaFe2As2 and possesses the highest Tc for FeSe-layer materials so far under ambient pressure. Hall effect indicates the carriers are dominated by electron in this superconductor. We confirm that the observed superconductivity at above 30 K is due to this new FeSe-based 122 phase. Our results demonstrate that FeSe-layer materials are really remarkable superconductors via structure and carrier modulation.
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