To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report

Abstract

In this review, the authors present a summary of experimental reports on newly discovered iron-based superconductors as they were known at the end of 2008. At the same time, this paper is intended to be useful for experimenters to know the current status of these superconductors. The authors introduce experimental results that reveal basic physical properties in the normal and superconducting states. The similarities and differences between iron-pnictide superconductors and other unconventional superconductors are also discussed.

arXiv comment20 pages, 32 figures. Open select

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• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
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• Electrodynamics of Correlated Electron Materials
• Functional renormalization group approach to correlated fermion systems
• Iron-Based Superconductors: current status of materials and pairing mechanism
• Quantum critical point lying beneath the superconducting dome in iron-pnictides
• Preemptive nematic order, pseudogap, and orbital order in the iron pnictides
• Scattering and Pairing in Cuprate Superconductors
• A review of Fe-chalcogenide superconductors: the simplest Fe-based superconductor
• Comparison of Ab initio Low-Energy Models for LaFePO, LaFeAsO, BaFe2As2, LiFeAs, FeSe and FeTe: Electron Correlation and Covalency
• Time Reversal Invariant Topological Superconductivity and Majorana Kramers Pairs
• Iron based superconductors: magnetism, superconductivity and electronic structure
• Line nodes in the energy gap of high-temperature superconducting BaFe_2(As_{1-x}P_x)_2 from penetration depth and thermal conductivity measurements
• Distinct Fermi Surface Topology and Nodeless Superconducting Gap in (Tl0.58Rb0.42)Fe1.72Se2 Superconductor
• Topological Mirror Superconductivity
• The Physics and Applications of Superconducting Metamaterials
• d-wave pairing from spin fluctuations in the KxFe{2-y}Se2 superconductors
• Evidence for superconducting gap nodes in the zone-centered hole bands of KFe2As2 from magnetic penetration-depth measurements
• Phase diagram and Gap anisotropy in Iron-Pnictide Superconductors
• Nodes in the gap structure of the iron-arsenide superconductor Ba(Fe_{1-x}Co_x)_2As_2 from c-axis heat transport measurements
• Doping dependence of heat transport in the iron-arsenide superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$: from isotropic to strongly $k$-dependent gap structure
• Sensitivity of the superconducting state and magnetic susceptibility to key aspects of electronic structure in ferropnictides
• ^{31}P and ^{75}As NMR evidence for a residual density of states at zero energy in superconducting BaFe_2(As_{0.67}P_{0.33})_2
• The effect of varying Fe-content on transport properties of K intercalated iron selenide KxFe2-ySe2
• Pseudogap from ARPES experiment: three gaps in cuprates and topological superconductivity
• Transport properties of the new Fe-based superconductor KxFe2Se2 (Tc = 33 K)
• Low-energy microscopic models for iron-based superconductors: a review
• Electronic Structure Calculation by First Principles for Strongly Correlated Electron Systems
• Electronic Structure and Superconductivity of FeSe-Related Superconductors
• Universal Decomposition of the Low-Frequency Conductivity Spectra of Iron-Pnictides Uncovering Fermi-Liquid Behavior
• Superconductivity in the Honeycomb-Lattice Pnictide SrPtAs
• The Unusual Superconducting State at 49 K in Electron-Doped CaFe2As2 at Ambient
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• Electronic structure of NaFeAs superconductor: LDA+DMFT calculations compared with ARPES experiment
• Magnetotransport studies of EuFe${}_2$As${}_2$: the influence of the Eu${}^{2+}$ magnetic moments
• Electronic structure of FeSe monolayer superconductors: shallow bands and correlations
• Crystal Symmetry and Magnetic Order in Iron Pnictides: a Tight Binding Wannier Function Analysis
• Anisotropic magnetism, resistivity, London penetration depth and magneto-optical imaging of superconducting K0.80Fe1.76Se2 single crystals
• Superconductivity in 122-type antimonide BaPt${}_2$Sb${}_2$
• Signatures of time-reversal-invariant topological superconductivity in the Josephson effect
• Incommensurate Magnetism in FeAs Strips: Neutron Scattering from CaFe${}_4$As${}_3$
• Meissner response of a bulk superconductor with an embedded sheet of reduced penetration depth
• Calorimetric Evidence for Nodes in the Overdoped Ba(Fe${}_{0.9}$Co${}_{0.1}$)${}_2$As${}_2$
• RE L${}_3$ X-ray absorption study of REO${}_{1-x}$F${}_x$FeAs (RE=La, Pr, Nd, Sm) oxypnictides
• Magnetic penetration-depth measurements of a suppressed superfluid density of superconducting Ca${}_{0.5}$Na${}_{0.5}$Fe${}_2$As${}_2$ single crystals by proton irradiation
• Massless collective excitations in frustrated multi-band superconductors
• GPU-based acceleration of free energy calculations in solid state physics
• Electronic Structure of New Multiple Band Pt-Pnictide Superconductors APt3P
• Phase diagram and quantum-criticality of the two dimensional dissipative quantum XY model
• Electronic structure of iron-based superconductors: from pnictides to chalcogenides and other similar systems
• Upper critical magnetic field in K0.83Fe1.83Se2 and Eu0.5K0.5Fe2As2 single crystals
• Anisotropic Superconducting Properties of Optimally Doped BaFe${}_2$(As${}_{0.65}$P${}_{0.35}$)${}_2$ under Pressure
• Electron transport and anisotropy of the upper critical magnetic field in a Ba0.68K0.32Fe2As2 single crystals
• Strongly correlated superconductivity with long-range spatial fluctuations
• Origin of Tc Enhancement Induced by Doping Yttrium and Hydrogen into LaFeAsO-based Superconductors: 57Fe, 75As, 139La, and 1H-NMR Studies
• Upper critical magnetic field in Ba_0.68K_0.32Fe_2As_2 and Ba(Fe_0.93Co_0.07)_2As_2
• Transport properties of 3D extended s-wave states in Fe-based superconductors
• Suppression of superconductivity in layered Bi4O4S3 by Ag doping
• Improving quantum-transition temperatures in BaFe2As2-based crystals by removing local-lattice strain & electronic-structure disorder
• Bulk superconductivity in single phase Bi3O2S3
• Superconductivity in PbO-type Fe chalcogenides
• Novel multiple-band superconductor SrPt2As2
• Chemical pressure effect on Tc in BiS2-based Ce1-xNdxO0.5F0.5BiS2
• Magnetic and superconducting properties on S-type single-crystal CeCu${}_2$Si${}_2$ probed by ${}^{63}$Cu nuclear magnetic resonance and nuclear quadrupole resonance
• Antiferromagnetic spin correlations and pseudogap-like behavior in Ca(Fe1-xCox)2As2 studied by 75As nuclear magnetic resonance and anisotropic resistivity
• Possible unconventional superconductivity in substituted BaFe${}_2$As${}_2$ revealed by magnetic pair-breaking studies
• Superconducting properties of novel BiSe${}_2$-based layered LaO${}_{1-x}$F${}_x$BiSe${}_2$ single crystals
• On the origin of the shallow and "replica" bands in FeSe monolayer superconductors
• Thermal expansion of CaFe2As2: effect of cobalt doping and post-growth thermal treatment
• Competing spin density wave, collinear, and helical magnetism in Fe1+xTe
• Effect of Co Impurities on Superconductivity of FeSe0.4Te0.6 single crystals
• Analysis of transport properties of iron pnictides: spin-fluctuation scenario
• Observation of Two Collapsed Phases in CaRbFe4As4
• Temperature dependent local structure of NdFeAsO1-xFx system using arsenic K-edge extended x-ray absorption fine structure
• Electronic structure of CaFe2As2
• Enhanced quasiparticle heat conduction of the multigap superconductor Lu2Fe3Si5
• Point-contact study of ReFeAs(1-x)Fx (Re=La, Sm) superconducting films
• $H$-$T$ Phase Diagram of Multi-component Superconductors with Frustrated Inter-component Couplings
• Superconductivity in SrFe2As2 with Pt Doping
• Spiral magnetic phases on the Kondo Lattice Model: A Hartree-Fock approach
• Local Structure of the Superconductor K0.8Fe1.6+xSe2: Evidence of Large Structural Disorder
• Observation of a Phase Transition at 55 K in Single-Crystal CaCu1.7As2
• Role of Magnetism in Superconductivity of BaFe2As2: Study of 5d Au-doped Crystals
• Doping effects of Co, Ni, and Cu in FeTe0.65Se0.35 single crystals
• Anion height as a controlling parameter for the superconductivity in iron pnictides and cuprates
• Electronic phase diagram of NdFe1-xRhxAsO
• Synthesis, structural and physical properties of ${\delta }^{\prime }$-FeSe${}_{1-x}$
• Incommensurate spin-density wave and multiband superconductivity in Na${}_x$FeAs as revealed by nuclear magnetic resonance
• Fully gapped superconductivity in SrNi${}_2$P${}_2$
• Elucidation of the helical spin structure of FeAs
• Crystal structure instability of FeSe grains: Formation of non-superconducting phase at the grain surface
• Crossover of the dimensionality of 3d spin fluctuations in LaCoPO
• Evidence for conventional superconductivity in SrPd2Ge2
• Andreev bound states in iron pnictide superconductors
• Superconductivity in titanium-based pnictide oxide compounds
• Looking at the superconducting gap of iron pnictides
• Large low-temperature magnetoresistance in SrFe2As2 single crystals
• Theory of macroscopic quantum tunneling with Josephson-Leggett collective excitations in multi-band superconducting Josephson junctions
• Cyclotron resonance and mass enhancement by electron correlation in KFe${}_2$As${}_2$
• Single crystal growth and structural characterization of FeTe1-xSx
• Optical properties of the iron-chalcogenide superconductor FeTe0.55Se0.45
• Trends in Heavy Fermion Matter
• Orbital-Selective Superconductivity and the Effect of Lattice Distortion in Iron-Based Superconductors
• A density functional theory study of FeAs comparing LDA+U, GGA+U and hybrid functionals
• Dimensionality, nematicity and Superconductivity in Fe-based systems
• Pressure dependence of the low- temperature crystal structure and phase transition behaviour of CaFeAsF and SrFeAsF: A synchrotron x-ray diffraction study
• Comprehensive study of out-of-plane transport properties in BaFe${}_2$As${}_2$: Three-dimensional electronic state and effect of chemical substitution
• Peak in the superconducting transition temperature of the nonmagnetic topological line-nodal material CaSb${}_2$ under pressure
• Fe-spin reorientation in PrFeAsO : Evidences from resistivity and specific heat studies
• Type-1.5 superconductivity in muliband and other multicomponent systems
• Physics picture from neutron scattering study on Fe-based superconductors
• Strong-Coupling Superconductivity in BaPd2As2 Induced by Soft Phonons in the ThCr2Si2-type Polymorph
• Thermodynamic electric quadrupole moments of nematic phases from first-principles calculation
• Interorbital pair scattering in clean and impure superconductors
• LDA'+DMFT Investigation of Electronic Structure of K{1-x}Fe{2-y}Se2 Superconductor
• Effect of annealing on the specific heat of optimally doped Ba(Fe${}_{0.92}$Co${}_{0.08}$)${}_2$As${}_2$
• Magnetic neutron scattering studies on the Fe-based superconductor system Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Fully gapped superconductivity in Ni-pnictide superconductors BaNi2As2 and SrNi2P2
• Electrodynamics of BaFe2As2 from infrared measurements under pressure
• High-Pressure Electrical Resistivity Measurements of EuFe2As2 Single Crystals
• Screening of the Raman response in multiband superconductors -- application to iron-pnictides
• Antiferromagnetic Order and Superconductivity in Sr4(Mg0.5-xTi0.5+x)2O6Fe2As2 with Electron Doping: 75As-NMR Study
• Simple Real-Space Picture of Nodeless and Nodal s-wave Gap Functions in Iron Pnictide Superconductors
• Neutron diffraction study on magnetic structures and transitions in Sr2Cr3As2O2
• Anisotropic Superconductivity Emerging from the Orbital Degrees of Freedom in a ${\Gamma }_3$ Non-Kramers Doublet System
• High Field (14Tesla) Magneto Transport of Sm/PrFeAsO
• Genuine Electronic Structure and Superconducting Gap Structure in (Ba${}_{0.6}$K${}_{0.4}$)Fe${}_2$As${}_2$ Superconductor
• First-principles Studies for the Hydrogen Doping Effects on Iron-based Superconductors
• Magnetic surface reconstruction in the van-der-Waals antiferromagnet Fe${}_{1+x}$Te
• Static and Dynamical Susceptibility of LaO1-xFxFeAs
• Pairing mechanism in Fe pnictide superconductors
• Breakdown of Chemical Scaling for Pt-Doped CaFe2As2
• Electronic and Magnetic Properties of the New Iron -- Based Superconductor [Li${}_{1-x}$Fe${}_x$OH]FeSe
• Study of electron spin dynamics in grain aligned LaCoPO: an itinerant ferromagnet
• Structural and magnetic properties of Fe1+dTe single crystals
• Interplay between charge density wave and superconductivity in multi-band systems with inter-band Coulomb interaction
• Doping Dependence of Correlation Effects in K{1-x}Fe{2-y}Se2 Superconductor: LDA'+DMFT Investigation
• Anomalous Pressure Dependence of the Superconducting Transition Temperature in TlNi${}_2$Se${}_{2-x}$S${}_x$
• On the interband pairing in doped graphane
• Local nodal Cooper pairs in multiorbital systems
• Comparative Study of Electronic structure of New Superconductors (Sr,Ca)Pd2As2 and related compound BaPd2As2
• Theoretical study on the correlation between the spin fluctuation and $T_c$ in the isovalent-doped 1111 iron-based superconductors
• High-$T_c$ Iron-phosphide Superconductivity Enhanced by Reemergent Antiferromagnetic Spin Fluctuations in (Sr${}_4$Sc${}_2$O${}_6$)Fe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ probed by NMR
• Fractional Flux Plateau in Magnetization Curve of Multicomponent Superconductor Loop
• $c$-axis charge gap and its critical point in the heavily doped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Resistivity scaling in 1111 iron-pnictide superconductors
• High-field irreversible moment reorientation in the antiferromagnet Fe${}_{1.1}$Te
• Nematic and time-reversal breaking superconductivities coexisting with quadrupole order in a ${\Gamma }_3$ system
• Preparation of Thin Crystals of FeTe1-xSx Using the Scotch-Tape Method
• Three-dimensional anisotropic fluctuation diamagnetism around the superconducting transition of Ba(1-x)KxFe2As2 single crystals in the finite-field (or Prange) regime
• Weakness of Correlation Effect Manifestation in BaNi${}_2$As${}_2$: ARPES and LDA+DMFT study
• Understanding the re-entrant superconducting phase diagram of an iron-pnictide Ca${}_4$Al${}_2$O${}_6$Fe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Specific heat in strongly hole-doped Iron-based superconductors
• Magnetism and superconductivity in Eu0.2Sr0.8(Fe0.86Co0.14)2As2 probed by 75As NMR
• Study of Ni and Zn doped CeOFeAs: Effect on the structural transition and specific heat capacity
• 31P NMR Investigation of the Superconductor LiFeP (Tc = 5 K)
• The magnetoresistance and Hall effect in CeFeAsO: a high magnetic field study
• Orbital-dependent electron dynamics in Fe-pnictide superconductors
• Magnetic disorder and gap symmetry in optimally electron doped Sr(Fe, Co)${}_2$As${}_2$ superconductor
• Quantum Oscillations in EuFe2As2 single crystals
• Itinerant fermions on a triangular lattice: unconventional magnetism and other ordered states
• Unconventional superconductors: Iron-based diversity
• Electronic structure and possible pseudogap behavior in iron based superconductors
• Representation-protected topology of spin-singlet $s$-wave superconductors
• Enhancement of the critical current by surface irregularities in Fe-based superconductors
• Suppression of superconductivity and structural phase transition against pressure in Ca${}_{10}$(Ir${}_4$As${}_8$)(Fe${}_{2-x}$Ir${}_x$As${}_2$)${}_5$
• Weak-Coupling Theory for Multiband Superconductivity Induced by Jahn-Teller Phonons
• Pressure induced antiferromagnetic-tetragonal to nonmagnetic-collapse-tetragonal insulator-metal transition in ThMnAsN
• Improvement in granularity of NdFeAsO0.8F0.2 superconductor through Ag doping
• Metallicity of Ca2Cu6P5 with Single and Double Copper-Pnictide Layers
• Superconductivity in Se-doped La2O2Bi2Pb2S6-xSex with a Bi2Pb2Ch4-type thick conducting layer
• Persistent Magnetism in Silver-doped BaFe2As2 Crystals
• Study of non-Fermi Liquid behavior from partial nesting in multi-orbital superconductors
• Persistent antiferromagnetic order in heavily overdoped Ca${}_{1-x}$La${}_x$FeAs${}_2$
• Majorana edge states and topological properties in 1D/2D Rashba semiconductor proximity coupled to iron-based superconductor
• First-principles-based $\pm s$-wave modelling for iron-based superconductors:Studies for specific heat and nuclear magnetic relaxation rate
• Evolution of tetragonal phase in the FeSe wire fabricated by a novel chemical-transformation PIT process
• Effect of Impurities with Internal Structure on Multiband Superconductors - Possible Enhancement of Transition Temperature -
• 75As NMR probe of antiferromagnetic fluctuations in Ba(Fe1-xRux)2As2
• Magnetotransport properties in the magnetic phase of BaFe${}_{2-x}$T${}_x$As${}_2$ (T = Co,Ni): A magnetic excitations approach
• Acoustic lattice instabilities at the magneto-structural transition in Fe${}_{1.057(7)}$Te
• Effects of metallic spacer in layered superconducting Sr2(Mg${}_y$Ti${}_{1-y}$)O3FeAs
• Introduction to High-Temperature Superconductivity for Solid State Chemists
• Hidden Fermi surface in K${}_x$Fe${}_{2-y}$Se${}_2$: LDA+DMFT study
• Quantum-critical resistivity of strange metals in a magnetic field
• The role of magnetic excitations in magnetoresistance and Hall effect of slightly TM-substituted BaFe${}_2$As${}_2$ compounds (TM = Mn, Cu, Ni)
• Single crystal growth of BaFe${}_{2-x}$Co${}_x$As${}_2$ without fluxing agent
• 75As NMR local probe study of magnetism in (Eu1-xKx)Fe2As2
• Quantum-critical transport in marginal Fermi liquids
• Two-dimensional macroscopic quantum tunneling in multi-gap superconductor Josephson junctions
• Antiferromagnetic structure and magnetic properties of Dy2O2Te: An isostructural analog of the rare-earth superconductors R2O2Bi
• Three-dimensional spin susceptibility in Ba${}_{0.75}$K${}_{0.25}$Fe${}_2$As${}_2$: Out-of-plane modulation revealed by neutron spectroscopy and theoretical modeling
• Tunnelling matrix elements with antiferromagnetic Gutzwiller wave functions