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.

arXiv comment12 pages, 4 figures

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• Superconductivity in Iron Compounds
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• Interplay of antiferromagnetism, ferromagnetism and superconductivity in EuFe_2(As_1-xP_x)_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
• Coexistence of Superconductivity and Ferromagnetism in P-doped EuFe2As2
• Superconductivity of powder-in-tube Sr0.6K0.4Fe2As2 wires
• Superconductivity at 23 K and Low Anisotropy in Rb-Substituted BaFe_2As_2 Single Crystals
• Fabrication and characterization of iron pnictide wires and bulk materials through the powder-in-tube method
• Field induced spin reorientation and giant spin-lattice coupling in EuFe2As2
• Suppression of spin-density-wave transition and emergence of ferromagnetic ordering of Eu${}^{2+}$ moments in EuFe${}_{2-x}$Ni${}_x$As${}_2$
• Anisotropic superconductivity and magnetism in single-crystal RbEuFe${}_4$As${}_4$
• Synthesis and properties of La-doped CaFe2As2 single crystals with Tc = 42.7 K
• Low-temperature synthesis of SmFeAsO0.7F0.3 wires with high transport critical current density
• 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
• Enhanced critical current properties in Ba0.6K0.4+xFe2As2 superconductor by over-doping of potassium
• High-resolution angle-resolved photoemission spectroscopy study of the electronic structure of EuFe2As2
• Signatures of quantum criticality in hole-doped and chemically pressurized EuFe_2As_2 single crystals
• Strongly fluctuating moments in the high-temperature magnetic superconductor RbEuFe${}_4$As${}_4$
• Vortex state in iron-based superconductors with collinear antiferromagnetic cores
• Transport properties and anisotropy in rare earth doped CaFe2As2 single crystals with Tc above 40 K
• Superconductivity induced by doping Ru in SrFe2-xRuxAs2
• Microstructure and superconductivity of Ir-doped BaFe2As2 superconductor
• Helical structures in layered magnetic superconductors due to indirect exchange interactions mediated by interlayer tunneling
• Upper critical fields and critical current density of BaFe2(As0.68P0.32)2 single crystal
• Magnetic phase diagram in Eu${}_{1-x}$La${}_x$Fe${}_2$As${}_2$ single crystals
• Pressure-induced Superconductivity in Zintl Topological Insulator SrIn2As2
• Consistent picture for the electronic structure around a vortex core in iron-based superconductors
• Superconductivity induced by doping Rh in CaFe2-xRhxAs2
• Electron spin resonance in Eu based Fe pnictides
• Magnetic phase diagram of Ca-substituted EuFe${}_2$As${}_2$
• Superconductivity in SmFe1-xMxAsO (M = Co, Rh, Ir)
• Effects of the vortices and impurities on the nuclear spin relaxation rate in iron-based superconductors
• Lack of superconductivity in the phase diagram of single-crystalline Eu(Fe1-xCox)2As2 grown by transition metal arsenide flux
• 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