Superconductivity at 34.7 K in the iron arsenide Eu0.7Na0.3Fe2As2
Yanpeng Qi, Zhaoshun Gao, Lei Wang, Dongliang Wang, Xianping Zhang,, Yanwei Ma
TL;DR
This paper reports the discovery of superconductivity at 34.7 K in Eu0.7Na0.3Fe2As2, a doped iron arsenide compound, indicating potential for high-temperature superconductivity in this family.
Contribution
It demonstrates that partial sodium substitution in EuFe2As2 induces superconductivity at 34.7 K, expanding the understanding of doping effects in iron arsenide superconductors.
Findings
Superconductivity observed at 34.7 K in Eu0.7Na0.3Fe2As2
ThCr2Si2 structure confirmed as main phase
Higher Tc than Eu0.5K0.5Fe2As2
Abstract
EuFe2As2 is a member of the ternary iron arsenide family. Similar to BaFe2As2 and SrFe2As2, EuFe2As2 exhibits a clear anomaly in resistivity near 200 K. It suggests that EuFe2As2 is another promising parent compound in which superconductivity may be realized by appropriate doping. Here we report the discovery of superconductivity in Eu0.7Na0.3Fe2As2 by partial substitution of the europium site with sodium. ThCr2Si2 tetragonal structure, as expected for EuFe2As2, is formed as the main phase for the composition Eu0.7Na0.3Fe2As2. Resistivity measurement reveals a transition temperature as high as 34.7 K in this compound, which is higher than the Tc of Eu0.5K0.5Fe2As2.
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