Thorium-doping induced superconductivity up to 56 K in Gd1-xThxFeAsO

Abstract

Following the discovery of superconductivity in an iron-based arsenide LaO1-xFxFeAs with a superconducting transition temperature (Tc) of 26 K[1], Tc was pushed up surprisingly to above 40 K by either applying pressure[2] or replacing La with Sm[3], Ce[4], Nd[5] and Pr[6]. The maximum Tc has climbed to 55 K, observed in SmO1-xFxFeAs[7, 8] and SmFeAsO1-x[9]. The value of Tc was found to increase with decreasing lattice parameters in LnFeAsO1-xFx (Ln stands for the lanthanide elements) at an apparently optimal doping level. However, the F- doping in GdFeAsO is particularly difficult[10,11] due to the lattice mismatch between the Gd2O2 layers and Fe2As2 layers. Here we report observation of superconductivity with Tc as high as 56 K by the Th4+ substitution for Gd3+ in GdFeAsO. The incorporation of relatively large Th4+ ions relaxes the lattice mismatch, hence induces the high temperature superconductivity.

arXiv comment4 pages, 3 figures

References in corpus (13)

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• Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO${}_{1-x}$F${}_x$FeAs
• Superconductivity and Phase Diagram in the Iron-based Arsenic-oxides ReFeAsO1-delta (Re = rare earth metal) without F-Doping
• Competing Orders and Spin-Density-Wave Instability in La(O${}_{1-x}$F${}_x$)FeAs
• Superconductivity in iron-based F-doped layered quaternary compound Nd[O1-xFx]FeAs
• Superconductivity at 25 K in hole doped $(L{a}_{1-x}S{r}_x)OFeAs$
• Superconductivity at 52 K in iron-based F-doped layered quaternary compound Pr[O1-xFx]FeAs
• Crystallographic Phase Transition and High-Tc Superconductivity in LaFeAsO:F
• Superconductivity at 53.5 K in GdFeAsO1-delta
• Superconductivity at 36 K in Gadolinium-arsenide Oxides GdO${}_{1-x}$F${}_x$FeAs
• Specific heat of the iron-based high-$T_c$ superconductor SmO${}_{1-x}$F${}_x$FeAs
• Evidence for the Spin Density Wave in LaFeAsO

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• Shrinking of fluctuation region in a two-band superconductor
• Polaron-like vortices, dissociation transition and self induced pinning in magnetic superconductors
• One-step atmospheric pressure synthesis of the ground state of Fe based LaFeAsO1-d superconductor
• Superconducting Mechanism through direct and redox layer doping in Pnictides
• A High Pressure Neutron Study of Colossal Magnetoresistant NdMnAsO0.95F0.05
• Effects of the sintering atmosphere on the superconductivity of SmFeAsO1-xFx compounds
• Reversible tuning of magnetic order and intrinsic superconductivity in strained FeTe films via stoichiometry control
• Effect of substitution and heat treatment route on polycrystalline FeSe0.5Te0.5 Superconductors
• Magnetocrystalline anisotropic effect in GdCo${}_{1-x}$Fe${}_x$AsO ($x=0,0.05$)
• Nematicity in LaFeAsO single crystals studied by elastoresistance, high-resolution thermal expansion and shear-modulus measurements