New Fe-based superconductors: properties relevant for applications

Abstract

Less than two years after the discovery of high temperature superconductivity in oxypnictide LaFeAs(O,F) several families of superconductors based on Fe layers (1111, 122, 11, 111) are available. They share several characteristics with cuprate superconductors that compromise easy applications, such as the layered structure, the small coherence length, and unconventional pairing, On the other hand the Fe-based superconductors have metallic parent compounds, and their electronic anisotropy is generally smaller and does not strongly depend on the level of doping, the supposed order parameter symmetry is s wave, thus in principle not so detrimental to current transmission across grain boundaries. From the application point of view, the main efforts are still devoted to investigate the superconducting properties, to distinguish intrinsic from extrinsic behaviours and to compare the different families in order to identify which one is the fittest for the quest for better and more practical superconductors. The 1111 family shows the highest Tc, huge but also the most anisotropic upper critical field and in-field, fan-shaped resistive transitions reminiscent of those of cuprates, while the 122 family is much less anisotropic with sharper resistive transitions as in low temperature superconductors, but with about half the Tc of the 1111 compounds. An overview of the main superconducting properties relevant to applications will be presented. Upper critical field, electronic anisotropy parameter, intragranular and intergranular critical current density will be discussed and compared, where possible, across the Fe-based superconductor families.

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Cited by in corpus (87)

• Superconductivity in Iron Compounds
• High-temperature superconductivity in iron-based materials
• Recent advances in iron-based superconductors toward applications
• Exploration of new superconductors and functional materials and fabrication of superconducting tapes and wires of iron pnictides
• Advantageous grain boundaries in iron pnictide superconductors
• High intergrain critical current density in fine-grain (Ba0.6K0.4)Fe2As2 wires and bulks
• Iron based superconductors: magnetism, superconductivity and electronic structure
• Spectroscopic scanning tunneling microscopy insights into Fe-based superconductors
• Progress in wire fabrication of iron-based superconductors
• Anisotropic thermodynamic and transport properties of single crystalline CaKFe${}_4$As${}_4$
• A review of two-band superconductivity: materials and effects on the thermodynamic and reversible mixed-state properties
• The behavior of grain boundaries in the Fe-based superconductors
• To use or not to use cool superconductors?
• Large Transport Critical Current Densities of Ag Sheathed (Ba,K)Fe2As2+Ag Superconducting Wires Fabricated by an ex-situ Powder-in-Tube (PIT) Process
• High transport current superconductivity in powder-in-tube Ba0.6K0.4Fe2As2 tapes at 27 tesla
• Temperature and time scaling of the peak-effect vortex configuration in FeTe${}_{0.7}$Se${}_{0.3}$
• First Homologous Series of Iron Pnictide Oxide Superconductors (Fe2As2)(Can+1(Sc,Ti)nOy) [n = 3,4,5] with Extremely Thick Blocking Layers
• Doping-dependent critical current properties in K, Co, and P-doped BaFe2As2 single crystals
• High transport critical current densities in textured Fe-sheathed Sr1-xKxFe2As2+Sn superconducting tapes
• Fe-based superconducting thin films on metallic substrates: growth, characteristics and relevant properties
• Intrinsic pinning and the critical current scaling of clean epitaxial Fe(Se,Te) thin films
• A new approach for improving global critical current density in Fe(Se0.5Te0.5) polycrystalline materials
• Transport and superconducting properties of Fe-based superconductors: SmFeAs(O1-x Fx) versus Fe1+y (Te1-x, Sex)
• Demonstration of an iron-pnictide bulk superconducting magnet capable of trapping over 1 T
• Thin Film Growth and Device Fabrication of Iron-Based Superconductors
• High transport Jc in magnetic fields up to 28 T of stainless steel/Ag double sheathed Ba122 tapes fabricated by scalable rolling process
• Mechanochemical synthesis of pnictide compounds and superconducting Ba0.6K0.4Fe2As2 bulks with high critical current density
• Giant anisotropy in superconducting single crystals of CsCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Grain boundary characteristics of Fe-based superconductors
• Strongly enhanced current densities in Sr0.6K0.4Fe2As2 superconducting tapes
• Evidence for electromagnetic granularity in polycrystalline Sm1111 iron-pnictides with enhanced phase purity
• Hydrostatic pressure: A very effective approach to significantly enhance critical current density in granular Sr4V2O6Fe2As2 superconductor
• Superconducting properties and magneto-optical imaging of Ba0.6K0.4Fe2As2 PIT wires with Ag addition
• Doping - dependent superconducting gap anisotropy in the two-dimensional 10-3-8 pnictide Ca${}_{10}$(Pt${}_3$As${}_8$)[(Fe${}_{1-x}$Pt${}_x$)${}_2$As${}_2$]${}_5$
• Using electron irradiation to probe iron - based superconductors
• Superconducting (Li, Fe)OHFeSe film of high quality and high critical parameters
• Anisotropic critical currents in FeSe0.5Te0.5 films and the influence of neutron irradiation
• Superconductivity at 48 K of heavily hydrogen-doped SmFeAsO epitaxial films grown by topotactic chemical reaction using CaH2
• Highly textured oxypnictide superconducting thin films on metal substrates
• Synthesis of CaKFe${}_4$As${}_4$ bulk samples with high critical current density using a spark plasma sintering technique
• Transport and pinning properties of Ag-doped FeSe0.94
• Angular-dependent upper critical field of overdoped Ba(Fe${}_{1-x}$Ni${}_x$)${}_2$As${}_2$
• Enhanced high-field transport critical current densities observed for the ex-situ PIT processed Ag/(Ba,K)Fe2As2 thin tapes
• Large enhancement of transport critical current density of ex-situ PIT Ag/(Ba,K)Fe2As2 tapes achieved by applying cycles of cold deformation and heat treatment
• Large transport Jc in Cu-sheathed Sr0.6K0.4Fe2As2 superconducting tape conductors
• Anisotropy of iron-platinum-arsenide Ca10(PtnAs8)(Fe2-xPtxAs2)5 single crystals
• Vortex phase dynamics in yttrium superhydride YH${}_6$ at megabar pressures
• Strengthened proximity effect at grain boundaries to enhance inter-grain supercurrent in Ba1-xKxFe2As2 superconductors
• Large transport critical currents and magneto-optical imaging of textured Sr1-xKxFe2As2 superconducting tapes
• Measurements of the superconducting fluctuations in optimally-doped BaFe${}_{2-x}$Ni${}_x$As${}_2$ under high magnetic fields: Probing the 3D anisotropic Ginzburg-Landau approach
• Improving quantum-transition temperatures in BaFe2As2-based crystals by removing local-lattice strain & electronic-structure disorder
• The Critical Magnetic Field of Anisotropic Two-Band Magnetic Superconductors
• Paraconductivity of K-doped SrFe2As2 superconductor
• Critical current density and magnetic phase diagram of BaFe1.29Ru0.71As2 Single Crystals
• Superconducting fluctuations in isovalently-substituted BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$: Possible observation of multiband effects
• Disorder-dependent superconducting phase-diagram at high magnetic fields in Fe${}_{1+y}$Se${}_x$Te${}_{1-x}$ ($x\sim 0.4$)
• Enhancement of transport critical current density of SmFeAsO1-xFx tapes fabricated by an ex-situ powder-in-tube method with a Sn-presintering process
• Single Vortex Pinning and Penetration Depth in Superconducting NdFeAsO${}_{1-x}$F${}_x$
• Strong anisotropy effect in iron-based superconductor CaFe${}_{0.882}$Co${}_{0.118}$AsF
• Evolution of vortex pinning in the FeSe${}_{1-x}$S${}_x$ system
• Measurements of the fluctuation-induced in-plane magnetoconductivity at high reduced temperatures and magnetic fields in the iron arsenide BaFe(2-x)NixAs2
• Quasi-2D behavior of 112-type iron-based superconductors
• Superconducting Fluctuations and Anomalous Phonon Renormalization much above superconducting transition temperature in Ca4Al2O5.7Fe2As2
• Critical current anisotropy in Nd-1111 single crystals and the infuence of neutron irradiation
• Effect of starting materials on the superconducting properties of SmFeAsO1-xFx tapes
• Elastic anisotropy and thermal properties of extended linear chain compounds MV${}_2$Ga${}_4$ (M = Sc, Zr, Hf) from ab-initio calculations
• Particulate Generation on Surface of Iron Selenide Films by Air Exposure
• SANS Study of Vortex Lattice Structural Transition in Optimally Doped (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$
• Fabrication of grain boundary junctions using NdFeAs(O,F) superconducting thin films
• Anisotropies and Homogeneities of Superconducting Properties in Iron-Platinum-Arsenide Ca10(Pt3As8)(Fe1.79Pt0.21As2)5
• Enhancement of the upper critical field in codoped iron-arsenic high-temperature superconductors
• Vortex lattice and vortex bound states in CsFe${}_2$As${}_2$ investigated by scanning tunneling microscopy/spectroscopy
• High $J_{\mathrm{c}}$ and low anisotropy of hydrogen doped NdFeAsO superconducting thin film
• Winding numbers of nodal points in Fe-based superconductors
• Advanced surface characterization of Ba(Fe${}_{0.92}$Co${}_{0.08}$)${}_2$As${}_2$ epitaxial thin films
• Synthesis of $c$-axis textured CaKFe${}_4$As${}_4$ superconducting bulk via spark plasma texturing technique
• Optimization of a Non-arsenic Iron-based Superconductor for Wire Fabrication
• Large increase of the anisotropy factor in the overdoped region of Ba(Fe${}_{1-x}$Ni${}_x$)${}_2$As${}_2$ as probed by fluctuation spectroscopy
• Huge magnetostriction in superconducting single-crystalline BaFe${}_{1.908}$Ni${}_{0.092}$As${}_2$
• Vanishing vortex creep at the transition from ordered to disordered vortex phases in Ba${}_{0.64}$K${}_{0.36}$Fe${}_2$As${}_2$
• Grain boundary characteristics of oxypnictide NdFeAs(O,F) superconductors
• Artificially Engineered Nanostrain in Iron Chalcogenide Superconductor Thin Film for Enhancing Supercurrent
• Calculation of the transport critical current density of c-axis textured 122 iron-based superconductors
• Localized High Frequency Electrodynamic Behavior of Optimally-doped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ Single Crystal films
• Superconducting properties of van der Waals metal-rich subsulfide Nb${}_{1.7}$Ta${}_{3.3}$S${}_2$
• High critical current density and low anisotropy in textured Sr1-xKxFe2As2 tapes for high field applications
• Electronic and Superconducting Properties of Some FeSe-based Single Crystals and Films Grown Hydrothermally