Superconductivity in the iron selenide KxFe2Se2 (0 <= x <= 1)

Details Superconductivity in the iron selenide KxFe2Se2 (0 <= x <= 1) Superconductivity in the iron selenide KxFe2Se2 (0 <= x <= 1)

2010-12-14

arxiv.org/abs/1012.2924v1

Physical Review B (R)(2010)

Physics

Condensed Matter

Superconductivity

18 pages,5 figures

Scientific paper

10.1016/j.physc.2011.04.009

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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