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.

4 pages, 3 figures

References in corpus (13)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• 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

Cited by in corpus (162)

• Magnetic order in BaFe2As2, the parent compound of the FeAs based superconductors in a new structural family
• Nearly Isotropic superconductivity in (Ba,K)Fe2As2
• Fe-based high temperature superconductivity with Tc=31K bordering an insulating antiferromagnet in (Tl,K)FexSe2 Crystals
• Electronic Structure and Doping in BaFe${}_2$As${}_2$ and LiFeAs: Density Functional Calculations
• Coexistence of the spin-density-wave and superconductivity in the (Ba,K)Fe2As2
• Superconductivity up to 30 K in the vicinity of quantum critical point in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Exploration of new superconductors and functional materials and fabrication of superconducting tapes and wires of iron pnictides
• Magnetism in Fe-based superconductors
• Superconductivity induced by Ni doping in BaFe${}_2$As${}_2$
• Advantageous grain boundaries in iron pnictide superconductors
• Superconductivity induced by phosphorus doping and its coexistence with ferromagnetism in EuFe${}_2$(As${}_{0.7}$P${}_{0.3}$)${}_2$
• Unconventional Superconductivity
• Crystallographic Phase Transition and High-Tc Superconductivity in LaFeAsO:F
• Superconductivity in SrFe_(2-x)Co_xAs_2: Internal Doping of the Iron Arsenide Layers
• High - Temperature Superconductivity in Iron Based Layered Compounds
• Superconductivity at 17 K in (Fe2P2)(Sr4Sc2O6): a new superconducting layered pnictide oxide with a thick perovskite oxide layer
• Microwave Penetration Depth and Quasiparticle Conductivity in PrFeAsO_1-y Single Crystals : Evidence for a Full-Gap Superconductor
• Iron based high transition temperature superconductors
• Momentum dependence of the superconducting gap in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Superconductivity induced by cobalt doping in iron-based oxyarsenides
• Effect of Co doping on superconductivity and transport properties in SmFe${}_{1-x}$Co${}_x$AsO
• Iron pnictides as a new setting for quantum criticality
• Pairing State with a time-reversal symmetry breaking in FeAs based superconductors
• Transport and anisotropy in single-crystalline SrFe${}_2$As${}_2$ and $A_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ ($A$ = Sr, Ba) superconductors
• Where Are the Extra d Electrons in Transition-Metal Substituted Fe Pnictides?
• Superconductivity at 32K and anisotropy in Tl0.58Rb0.42Fe1.72Se2 crystals
• Structure and Magnetic Order in the NdFeAs(O,F) Superconductor System
• Electronic Structure and Superconductivity of FeSe-Related Superconductors
• Exotic Superconducting States in FeSe-based Materials
• (Sr_3Sc_2O_5)Fe_2As_2 as a possible parent compound for FeAs-based superconductors
• Superconductivity in the Honeycomb-Lattice Pnictide SrPtAs
• Upper critical fields well above 100 T for the superconductor SmFeAsO${}_{0.85}$F${}_{0.15}$ with T${}_c$ = 46 K
• On the multi-orbital band structure and itinerant magnetism of iron-based superconductors
• Metamagnetic transition in EuFe${}_2$As${}_2$ single crystals
• High temperature superconducting FeSe films on SrTiO3 substrates
• Biaxially textured cobalt-doped BaFe2As2 films with high critical current density over 1 MA/cm2 on MgO-buffered metal-tape flexible substrates
• Influence of the rare-earth element on the effects of the structural and magnetic phase transitions in CeFeAsO, PrFeAsO, and NdFeAsO
• Temperature dependence of lower critical field Hc1(T) shows nodeless superconductivity in FeSe
• Superconductivity in LaFeAs${}_{1-x}$P${}_x$O: effect of chemical pressures and bond covalency
• High-T_c superconductivity induced by doping rare earth elements into CaFeAsF
• Superconductivity above 50K in LnFeAsO1-y (Ln= Nd, Sm, Gd, Tb and Dy) Synthesized by High-pressure Technique
• Superconductivity at Tc = 44 K in LixFe2Se2(NH3)y
• High Critical Current Density 4 MA/cm2 in Co-Doped BaFe2As2 Epitaxial Films Grown on (La, Sr)(Al, Ta)O3 Substrates without Buffer Layers
• Anomalous Eu Valence State and Superconductivity in Undoped Eu3Bi2S4F4
• SrFeAsF as a parent compound for iron pnictide superconductors
• Resistivity and upper critical field in KFe${}_2$As${}_2$ single crystals
• Narrow superconducting window in Ni-doped LaFeAsO
• Theory for Superconductivity in Iron Pnictides at Large Coulomb U Limit
• Nuclear magnetic relaxation and superfluid density in Fe-pnictide superconductors: An anisotropic \pm s-wave scenario
• Optical properties of the iron-arsenic superconductor BaFe1.85Co0.15As2
• Phonon anomalies in pure and underdoped R{1-x}K{x}Fe{2}As{2} (R = Ba, Sr) investigated by Raman light scattering
• Water-induced superconductivity in SrFe2As2
• Transport properties and superconductivity in $B{a}_{1-x}{M}_{x}F{e}_{2}A{s}_2$ (M=La and K) with double FeAs layers
• Antiferromagnetic ground state with pair-checkboard order in FeSe
• High-temperature superconductivity in one-unit-cell FeSe films
• Upper critical field and fluctuation conductivity in the critical regime of doped SmFeAsO
• Cobalt-substitution-induced Superconductivity in a New Compound with ZrCuSiAs-type Structure, SrFeAsF
• Superconductivity above 50 K in Tb${}_{1-x}$Th${}_x$FeAsO
• Atomically-flat, chemically-stable, superconducting epitaxial thin film of iron-based superconductor, cobalt-doped BaFe${}_2$As${}_2$
• Superconductivity in Fluorine-Arsenide Sr_{1-x}La_xFeAsF
• Lower Critical Fields of Superconducting PrFeAsO${}_{1-y}$ Single Crystals
• Superconductivity at 23 K and Low Anisotropy in Rb-Substituted BaFe_2As_2 Single Crystals
• Magnetic order in CaFe1-xCoxAsF (x = 0, 0.06, 0.12) superconductor compounds
• Large decrease in the critical temperature of superconducting LaFeAsO0.85 compounds doped with 3% atomic weight of nonmagnetic Zn impurities
• Properties of Binary Transition-Metal Arsenides (TAs)
• Vibrational spectrum and electron-phonon coupling of doped solid picene from first principles
• First-order structural transition in the magnetically ordered phase of Fe1.13Te
• Th substituted SmFeAsO: structural details and superconductivity with Tc above 50 K
• Effect of 3d Transition Metal Doping on the Superconductivity in Quaternary Fluoroarsenide CaFeAsF
• Self doping effect and successive magnetic transitions in superconducting Sr${}_2$VFeAsO${}_3$
• The Delicate Electronic and Magnetic Structure of the LaOFePn System (Pn = pnictogen)
• Epitaxial Growth of NdFeAsO Thin Films by Molecular Beam Epitaxy
• Calorimetric Evidence of Strong-Coupling Multiband Superconductivity in Fe(Te0.57Se0.43) Single Crystal
• Interplay between Fe and Nd magnetism in NdFeAsO single crystals
• Suppression of spin-density-wave transition and emergence of ferromagnetic ordering of Eu${}^{2+}$ moments in EuFe${}_{2-x}$Ni${}_x$As${}_2$
• Oxygen Vacancy Induced Flat Phonon Mode at FeSe /SrTiO3 interface
• CaFeAs${}_2$: a Staggered Intercalation of Quantum Spin Hall and High Temperature Superconductivity
• Upper and lower critical fields in NdFeAs(O,F) single crystals : a study by Hall probe magnetization and specific heat
• Band renormalization and Fermi surface reconstruction in iron-based superconductors
• Surface and bulk electronic structures of LaOFeAs studied by angle resolved photoemission spectroscopy
• Experimental Detection of Sign-Reversal Pairing in Iron-Based Superconductors
• Electronic structure of oxygen-free 38K superconductor Ba1-xKxFe2As2 in comparison with BaFe2As2 from first principles
• Development of very high Jc in Ba(Fe1-xCox)2As2 thin films grown on CaF2
• Anisotropic Phase Diagram and Superconducting Fluctuations in SmFeAsO0.85F0.15
• Artificial and self-assembled pinning centers in Ba(Fe1-xCox)2As2 thin films as a route to very high current density
• Neutron scattering investigation of the magnetic order in single crystalline BaFe2As2
• Suppression of the structural phase transition and lattice softening in slightly underdoped Ba(1-x)K(x)Fe2As2 with electronic phase separation
• $\pi$-junction to probe antiphase s-wave pairing in iron pnictide superconductors
• Evolution from incoherent to coherent electronic states and its implications to superconductivity in FeTe1-xSex
• Superconductivity in LnFePO (Ln = La, Pr, and Nd) single crystals
• Thermodynamic properties of Ba1-xMxFe2As2 (M = La and K)
• Effect of Zn doping on magnetic order and superconductivity in LaFeAsO
• Synthesis, structural and transport properties of the hole-doped Superconductor Pr_{1-x}Sr_xFeAsO
• Density Functional Study of the Over-Doped Iron Chalcogenide: TlFe${}_2$Se${}_2$ with ThCr${}_2$Si${}_2$ structure
• Suppression of spin density wave by isoelectronic substitution in PrFe(1-x)Ru(x)AsO
• Orbital fluctuation mechanism for superconductivity in iron-based compounds
• Electronic and lattice dynamical properties of the iron-based superconductors LiFeAs and NaFeAs
• Similar zone-center gaps in the low-energy spin-wave spectra of NaFeAs and BaFe2As2
• Superconductivity at 11.3 K induced by cobalt doping in CeOFeAs
• Superconductivity induced by oxygen deficiency in Sr-doped LaOFeAs
• Perturbation Theory of High-Tc Superconductivity in Iron Pnictides
• Antiferromagnetism in semiconducting SrMn2Sb2 and BaMn2Sb2 single crystals
• Multiorbital Effects on Antiferromagnetism in Fe Pnictides
• Electronic Structure and Mott Localization in Iron Deficient TlFe${}_{1.5}$Se${}_2$ with Superstructures
• Iron-platinum-arsenide superconductors Ca10(PtnAs8)(Fe2-xPtxAs2)5
• Effect of the chemical pressure on superconductivity and SDW in undoped and 15%F doped La1-yYyFeAsO compounds
• Electronic structure of single-crystalline Sr(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ probed by x-ray absorption spectroscopy: Evidence for isovalent substitution of Fe${}^{2+}$ by Co${}^{2+}$
• Upper critical field, superconducting energy gaps, and Seebeck coefficient in La0.8Th0.2OFeAs
• Vortex state in iron-based superconductors with collinear antiferromagnetic cores
• First-principles investigation of effect of pressure on BaFe${}_2$As${}_2$
• Electronic structure of new quaternary superconductors LaONiBi and LaOCuBi from first principles
• Penetration depth, lower critical fields, and quasiparticle conductivity in Fe-arsenide superconductors
• Crystal Symmetry and Magnetic Order in Iron Pnictides: a Tight Binding Wannier Function Analysis
• Fermi surface in BaNi${}_2$P${}_2$
• Possible Superconductivity in Fe-Sb Based Materials: Density Functional Study of LiFeSb
• Possible unconventional superconductivity in substituted BaFe${}_2$As${}_2$ revealed by magnetic pair-breaking studies
• Quasiclassical description of a superconductor with a spin density wave
• Superconductivity in ThMo2Si2C with Mo2C Square Net
• Band structure of SrFeAsF and CaFeAsF as parent phases for a new group of oxygen-free FeAs superconductors
• Origin of the non-monotonic variance of Tc in the 1111 iron based superconductors with isovalent doping
• Electronic phase diagram of NdFe1-xRhxAsO
• Structural and superconducting properties in LaFeAs1-xSbxO1-yFy
• Exchange striction driven magnetodielectric effect and potential photovoltaic effect in polar CaOFeS
• Theoretical investigation of magnetic order in ReOFeAs, Re = Ce, Pr
• Superconductivity of underdoped PrFeAs(O,F) investigated via point-contact spectroscopy and nuclear magnetic resonance
• Absence of Colossal Magnetoresistance in the Oxypnictide PrMnAsO0.95F0.05
• First-principles study of the robust superconducting state of NbTi alloys under ultrahigh pressures
• La2Sb, a layered superconductor with metal-metal bonds
• Nano-scale Inhomogeneous Superconductivity in Fe(Te1-xSex) Probed by Nanostructure-transport
• Antiphase magnetic boundaries in iron-based superconductors: A first-principle density-functional theory study
• Anomalous Tail Effect on Resistivity Transition and Weak-link Behavior of Iron Based Superconductor
• Magnetic neutron scattering studies on the Fe-based superconductor system Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Lattice Parameters Guide Superconductivity in Iron-Arsenides
• Soft phonons and structural phase transition in superconducting Ba0.59K0.41BiO3
• Multiple Superconducting Gaps, Anisotropic Spin Fluctuations and Spin-Orbit Coupling in Iron-Pnictides
• Hydrostatic and chemical pressure tuning of CeFeAs_1-xP_xO single crystals
• Flux-lattice melting in LaO${}_{1-x}$F${}_x$FeAs: first-principles prediction
• Magnetism driven by strong electronic correlation in the heavily carrier-doped iron oxypnictide LaFeAsO${}_{0.49}$H${}_{0.51}$
• Spin reorientation of the Fe moments in Eu${}_{0.5}$Ca${}_{0.5}$Fe${}_2$As${}_2$: Evidence for a strong interplay of Eu and Fe magnetism
• Suppression of $T_c$ by Zn impurity in the electron-type LaFe${}_{0.925-y}$Co${}_{0.075}$Zn${}_y$AsO system
• Predictions of highest Transition-temperature for electron-phonon superconductors
• ${}^{75}$As NMR study of the antiferromagnetic Kondo lattice compound CeNiAsO
• Strong surface termination dependence of the electronic structure of polar superconductor LaFeAsO revealed by nano-ARPES
• Band structure of (Sr3Sc2O5)Fe2As2 as a possible parent phase for new FeAs superconductors
• BaMn${}_2$P${}_2$: Highest magnetic ordering temperature 122-pnictide compound
• Superconductivity induced by U-doping in the SmFeAsO system
• Unconventional superconductivity originating from disconnected Fermi surfaces in the iron-based compound
• Elastic theory for the vortex-lattice melting in iron-based high-Tc superconductors
• Enhancement of critical current density in superconducting/magnetic multi-layers with slow magnetic relaxation dynamics and large magnetic susceptibility
• Superconducting Gap and Symmetry in FeSe_1-x_Te_x_ Studied by Specific Heat in Magnetic Fields
• Optimization of a Non-arsenic Iron-based Superconductor for Wire Fabrication
• A predictive bond order model connects covalent superconductivity, including cuprates, oxypnictides or HfN based materials
• Shrinking of fluctuation region in a two-band superconductor
• Electronic structure of LaFe1-xCoxAsO from first principle calculations
• Superconducting Stiffness and Coherence Length of FeSe${}_{0.5}$Te${}_{0.5}$ Measured in Zero-Applied Field
• Kondo-like behavior in a mixed valent oxypnictide $\mathrm{L}{\mathrm{a}}_3\mathrm{C}{\mathrm{u}}_4{\mathrm{P}}_4{\mathrm{O}}_2$
• One-step atmospheric pressure synthesis of the ground state of Fe based LaFeAsO1-d superconductor
• A High Pressure Neutron Study of Colossal Magnetoresistant NdMnAsO0.95F0.05
• Nematicity in LaFeAsO single crystals studied by elastoresistance, high-resolution thermal expansion and shear-modulus measurements
• Reversible tuning of magnetic order and intrinsic superconductivity in strained FeTe films via stoichiometry control
• Magnetocrystalline anisotropic effect in GdCo${}_{1-x}$Fe${}_x$AsO ($x=0,0.05$)
• Effect of substitution and heat treatment route on polycrystalline FeSe0.5Te0.5 Superconductors