Superconductivity at 34.7 K in the iron arsenide Eu0.7Na0.3Fe2As2

Yanpeng Qi; Zhaoshun Gao; Lei Wang; Dongliang Wang; Xianping Zhang; Yanwei Ma

doi:10.1088/1367-2630/10/12/123003

Superconductivity at 34.7 K in the iron arsenide Eu0.7Na0.3Fe2As2

Superconductivity 2009-11-13 v3

Authors: Yanpeng Qi , Zhaoshun Gao , Lei Wang , Dongliang Wang , Xianping Zhang , Yanwei Ma

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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.

Keywords

superconductivity iron arsenide Eu0.7Na0.3Fe2As2 sodium doping transition temperature

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@article{arxiv.0807.3293,
  title  = {Superconductivity at 34.7 K in the iron arsenide Eu0.7Na0.3Fe2As2},
  author = {Yanpeng Qi and Zhaoshun Gao and Lei Wang and Dongliang Wang and Xianping Zhang and Yanwei Ma},
  journal= {arXiv preprint arXiv:0807.3293},
  year   = {2009}
}

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12 pages, 4 figures

Superconductivity at 34.7 K in the iron arsenide Eu0.7Na0.3Fe2As2

Abstract

Keywords

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