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

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.

12 pages, 4 figures

References in corpus (4)

• Superconductivity in iron-based F-doped layered quaternary compound Nd[O1-xFx]FeAs
• Superconductivity at 25 K in hole doped $(L{a}_{1-x}S{r}_x)OFeAs$
• Antiferromagnetic transition in EuFe${}_2$As${}_2$: A possible parent compound for superconductors
• Superconductivity at 36 K in Gadolinium-arsenide Oxides GdO${}_{1-x}$F${}_x$FeAs

Cited by in corpus (15)

• Magnetism in Fe-based superconductors
• Metamagnetic transition in EuFe${}_2$As${}_2$ single crystals
• EuFe${}_2$As${}_2$ under high pressure: an antiferromagnetic bulk superconductor
• Effects of Pressure and Doping on Ruddlesden-Popper phases Lan+1NinO3n+1
• Superconductivity at 23 K and Low Anisotropy in Rb-Substituted BaFe_2As_2 Single Crystals
• Suppression of spin-density-wave transition and emergence of ferromagnetic ordering of Eu${}^{2+}$ moments in EuFe${}_{2-x}$Ni${}_x$As${}_2$
• Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe${}_4$As${}_4$
• Interplay between superconductivity and magnetism in K-doped EuFe2As2
• Magnetic structure of the Eu2+ moments in superconducting EuFe2(As1-xPx)2 with x = 0.19
• Vortex state in iron-based superconductors with collinear antiferromagnetic cores
• Helical structures in layered magnetic superconductors due to indirect exchange interactions mediated by interlayer tunneling
• Pressure-induced Superconductivity in Zintl Topological Insulator SrIn2As2
• Electron spin resonance in Eu based Fe pnictides
• Superconductivity above 30 K due to the introduction of oxygen in CaFeAsF
• Spin waves and high-frequency response in layered superconductors with helical magnetic structure