Iron-Based Superconductors: current status of materials and pairing mechanism

Abstract

Since the discovery of high Tc iron-based superconductors in early 2008, more than 15,000 papers have been published as a result of intensive research. This paper describes the current status of iron-based superconductors (IBSC) covering most up-to-date research progress along with the some background research, focusing on materials (bulk and thin film) and pairing mechanism.

arXiv comment23 Figs. 8 Tables, 222 refs, 82 pages, in press, Physica C (2015)

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• Unified Picture for Magnetic Correlations in Iron-Based Superconductors
• Two-Orbital Model Explains the Higher Transition Temperature of the Single-Layer Hg-Cuprate Superconductor Compared to That of the La-Cuprate Superconductor
• Anisotropic Energy Gaps of Iron-based Superconductivity from Intra-band Quasiparticle Interference in LiFeAs
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• Spin dynamics and an orbital-antiphase pairing symmetry in iron-based superconductors
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• Where Are the Extra d Electrons in Transition-Metal Substituted Fe Pnictides?
• Exotic d-wave superconductivity in strongly hole doped K(x)Ba(1-x)Fe2As2
• Itinerant Ferromagnetism in layered crystals LaCoOX (X = P, As)
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• Momentum dependence and nodes of the superconducting gap in iron-pnictides
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• Two types of s-wave pairing due to magnetic and orbital fluctuations in the two-dimensional 16-band d-p model for iron-based superconductors
• One-sign order parameter in iron based superconductor
• Symmetry analysis of possible superconducting states in KxFe2Se2 superconductors
• Psuedo-isotropic upper critical field in cobalt-doped SrFe2As2 epitaxial films
• Disorder-induced topological change of the superconducting gap structure in iron pnictides
• Superconductivity in Epitaxial Thin Films of Co-Doped SrFe2As2 with Bilayered FeAs Structures and their Magnetic Anisotropy
• Superconducting and ferromagnetic phases induced by lattice distortions in SrFe2As2
• Muon spin relaxation studies of magnetic order and superfluid density in antiferromagnetic NdOFeAs, BaFe2As2 and superconducting (Ba,K)Fe2As2
• Superconductivity and phase instability of NH3-free Na-intercalated FeSe1-zSz
• Preparation and superconductivity of iron selenide thin films
• Possible three dimensional nodes in the $s\pm$ superconducting gap of BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• First-principles calculation of transition-metal impurities in LaFeAsO
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• Nodes in the Gap Function of LaFePO, the Gap Function of the Fe(Se,Te) Systems, and the STM Signature of the s${}_{\pm }$ Pairing
• Reciprocal-space structure and dispersion of the magnetic resonant mode in the superconducting phase of Rb(x)Fe(2-y)Se2 single crystals
• s-wave superconductivity from antiferromagnetic spin-fluctuation model for bilayer materials
• Water-induced superconductivity in SrFe2As2
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• Possible high $T_c$ superconductivity mediated by antiferromagnetic spin fluctuations in systems with Fermi surface pockets
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• Two- and Three-Dimensional Fermi Surfaces and their Nesting Properties in Superconducting BaFe2(As1-xPx)2
• In-situ growth of superconducting NdFeAs(O,F) thin films by Molecular Beam Epitaxy
• Superconducting gap in LiFeAs from three-dimensional spin-fluctuation pairing calculations
• d- and f-orbital correlations in the REFeAsO compounds
• Spin fluctuations and unconventional pairing in KFe${}_2$As${}_2$
• Thin Film Growth and Device Fabrication of Iron-Based Superconductors
• Fermiology, Orbital Order, Orbital Fluctuation and Cooper Pairing in Iron-based Superconductors
• Coherent interfacial bonding on the FeAs tetrahedron in Fe/Ba(Fe(1-x)Co(x))2As2 bilayers
• Magnetism and Superconductivity in the Two-Dimensional 16 Band d-p Model for Iron-Based Superconductors
• Is Fermi-surface nesting the origin of superconductivity in iron pnictides?: A fluctuation-exchange-approximation study
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• Alcoholic beverages induce superconductivity in FeTe${}_{1-x}$S${}_x$
• Superconductivity at the Border of Electron Localization and Itinerancy
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• Maximizing Fermi surface multiplicity optimizes superconductivity in iron pnictides
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• Shadow gap in the over-doped (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ compound
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• Identical effects of indirect and direct electron doping of superconducting BaFe2As2 thin films
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• Single Impurity Problem in Iron-Pnictide Superconductors
• Spin fluctuations and superconductivity in KxFe{2-y}Se2
• Full Gap Superconductivity in Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ Probed by Muon Spin Rotation
• Superconductivity at 52 K in hydrogen-substituted LaFeAsO1-xHx under high pressure
• Superconductivity induced by hydrogen anion substitution in 1111-type iron arsenides
• Evolution of the Phase Diagram of LaFeP${}_{1-x}$As${}_x$O${}_{1-y}$F${}_y$ ($y$ = 0 -- 0.1)
• Overview on the physics and materials of the new superconductor KxFe2-ySe2
• Electric double-layer transistor using layered iron selenide Mott insulator TlFe1.6Se2
• Neutron-scattering measurements of the spin excitations in LaFeAsO and Ba(Fe${}_{0.953}$Co${}_{0.047}$)${}_2$As${}_2$: Evidence for a sharp enhancement of spin fluctuations by nematic order
• Electronic Structure of Novel Superconductor Ca4Al2O6Fe2As2
• Switching of intra-orbital spin excitations in electron-doped iron pnictide superconductors
• Two distinct superconducting states in KFe${}_2$As${}_2$ under high pressure
• Controlling Factors of Tc-Dome Structure in 1111-Type Iron Arsenide Superconductors
• Enhancement of Superconducting Transition Temperature Due to Antiferromagnetic Spin Fluctuations in Iron-pnictides LaFe(As_{1-x}P_x)(O_{1-y}F_y) : 31P-NMR Studies
• Cooperative effects of Coulomb and electron-phonon interactions in the two-dimensional 16-band d-p model for iron-based superconductors
• Study of phase diagram and superconducting states in LaFeAsO${}_{1-x}$H${}_x$ based on the multiorbital extended Hubbard model
• Effect of electron-phonon interactions on orbital fluctuations in iron-based superconductors
• The electronic instabilities of the Iron-based superconductors: a variational Monte-Carlo study
• Unusual Phase Transitions and Magnetoelastic Coupling in TlFe1.6Se2 Single Crystals
• Two Fermi surface states and two $T_{\mathrm{c}}$-rising mechanisms revealed by transport properties in $R$FeP${}_{1-x}$As${}_x$O${}_{0.9}$F${}_{0.1}$ ($R$=La, Pr and Nd)
• Robust spin fluctuations and $s\pm$ pairing in the heavily electron doped iron-based superconductors
• Functional renormalization group study of an eight-band model for the iron arsenides
• A High-Tc Mechanism of Iron Pnictide Superconductivity due to Cooperation of Ferro-orbital and Antiferromagnetic Fluctuations
• Determination of the pairing state in iron-based superconductors through neutron scattering
• Possibility of Unconventional Pairing Due to Coulomb Interaction in Fe-Based Pnictide Superconductors: Perturbative Analysis of Multi-Band Hubbard Models
• Antiferromagnetism in Iron-Based Superconductors: Selection of Magnetic Order and Quasiparticle Interference
• Robust accidental nodes and zeroes and critical quasiparticle scaling in iron-based multiband superconductors
• Least momentum space frustration as a condition for "high $T_c$ sweet spot" in the iron-based superconductors
• Reproduction of Experimental Gap Structure in LiFeAs based on the Orbital-Spin Fluctuation Theory: $s_{++}$-wave, $s_{\pm }$-wave, and hole-$s_{\pm }$-wave states
• Phase diagram and optical conductivity of La1.8-xEu0.2SrxCuO4
• Q-scan-analysis of the neutron scattering in iron-based superconductors
• Understanding the re-entrant superconducting phase diagram of an iron-pnictide Ca${}_4$Al${}_2$O${}_6$Fe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Effect of the iron valence in the two types of layers in LiFeO${}_2$Fe${}_2$Se${}_2$

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• Details of the disorder-induced transition between $s_{\pm }$ and $s_{++}$ states in two-band model for Fe-based superconductors
• Spin excitation anisotropy in the paramagnetic tetragonal phase of BaFe2 As2
• Evidence of nodal superconductivity in LaFeSiH
• Orbital localization and the role of the Fe and As $4p$ orbitals in BaFe${}_2$As${}_2$ probed by XANES
• Superconductivity and magnetic and transport properties of single-crystalline CaK(Fe${}_{1-x}$Cr${}_x$)${}_4$As${}_4$
• Superconducting transition temperatures in the electronic and magnetic phase diagrams of Sr2VFeAsO3-delta, a superconductor
• Local characterization of a heavy-fermion superconductor via sub-Kelvin magnetic force microscopy
• Particulate Generation on Surface of Iron Selenide Films by Air Exposure
• Anisotropy of the magnetic properties of the FeTe0.65Se0.35 superconductor
• Magnetic and superconducting anisotropy in Ni-doped RbEuFe${}_4$As${}_4$ single crystals
• $t$-$J$ model for strongly correlated two-orbital systems: Application to bilayer nickelate superconductors
• Stability of Bogoliubov Fermi Surfaces within BCS Theory
• Fermi surface and mass renormalization in the iron-based superconductor YFe${}_2$Ge${}_2$
• Simultaneous collapse of antiferroquadrupolar order and superconductivity in PrIr${}_2$Zn${}_{20}$ by nonhydrostatic pressure
• First-principles study of magnetism, lattice dynamics, and superconductivity in LaFeSiH${}_x$
• Incoherent electronic band states in Mn-substituted BaFe${}_2$As${}_2$
• Single-crystal growth of iron-based superconductor La${}_{0.34}$Na${}_{0.66}$Fe${}_2$As${}_2$
• Excitonic Order and Superconductivity in the Two-Orbital Hubbard Model: Variational Cluster Approach
• 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
• Theoretical approach to resonant inelastic x-ray scattering in iron-based superconductors at the energy scale of the superconducting gap
• Spin correlation in trigonal EuMn${}_2$As${}_2$
• Strong Landau-quantization effects in high-magnetic-field superconductivity of a two-dimensional multiple-band metal near the Lifshitz transition
• Magnetism driven by strong electronic correlation in the heavily carrier-doped iron oxypnictide LaFeAsO${}_{0.49}$H${}_{0.51}$
• Structural disorder in Li(x)[C5H5N](y)Fe(2-z)Se2 and Cs(x)Fe(2-z)Se2 superconductors studied by Mössbauer spectroscopy
• Superconductor discovery in the emerging paradigm of Materials Informatics
• Evolution of shape and volume fraction of superconducting domains with temperature and anion disorder in (TMTSF)${}_2$ClO${}_4$
• Observation of Dirac-like energy band and unusual spectral line shape in quasi-one-dimensional superconductor Tl2Mo6Se6
• Growth of nematic susceptibility in the field-induced normal state of an iron-based superconductor revealed by elastoresistivity measurements in a 65 T pulsed magnet
• Drastic enhancement of the superconducting temperature in type-II Weyl semimetal candidate MoTe${}_2$ via biaxial strain
• Uncovering anisotropic magnetic phases via fast dimensionality analysis
• Stabilization and heteroepitaxial growth of metastable tetragonal FeS thin films by pulsed laser deposition
• High-energy spin fluctuation in low-$T_{\mathrm{c}}$ iron-based superconductor LaFePO${}_{0.9}$
• Nearly ferromagnetic metal state in the collapsed tetragonal phase of YFe${}_2$(Ge,Si)${}_2$
• Quasiparticle interference in multiband superconductors with strong coupling
• Data analysis of $ab$ $initio$ effective Hamiltonians in iron-based superconductors $\unicode{x2014}$ Construction of predictors for superconducting critical temperature
• Effect of nonsymmorphic space group on correlation functions in iron-based superconductors
• Flat bands in condensed-matter systems -- perspective for magnetism and superconductivity
• One-dimensional scattering of two-dimensional fermions near quantum criticality
• The Future of the Correlated Electron Problem
• Magnetic and structural properties of the iron silicide superconductor LaFeSiH
• Magnetic competition in iron-based germanide and silicide superconductors
• c-axis pressure induced antiferromagnetic order in optimally P-doped BaFe2(As0.70P0.30)2 superconductor
• Quantum dynamics of hydrogen in iron-based superconductor LaFeAsO0.9D0.1 measured with inelastic neutron spectroscopy
• An efficient GPU algorithm for tetrahedron-based Brillouin-zone integration
• Surface Nematic Order in Iron Pnictides
• Magnetic disorder and gap symmetry in optimally electron doped Sr(Fe, Co)${}_2$As${}_2$ superconductor
• Diverse Exotic Orders and Fermiology in Fe-based Superconductors: A Unified Mechanism for $B_{1g}/B_{2g}$ Nematicity in FeSe/(Cs,Rb)Fe${}_2$As${}_2$ and Smectic Order in BaFe${}_2$As${}_2$
• In-situ visualization of local distortions in the high-$T_c$ molecule-intercalated $L{i}_x(C_5{H}_{5}N{)}_{y}F{e}_{2-z}S{e}_2$ superconductor
• Vacancy-free cubic superconducting NbN enabled by quantum anharmonicity
• Enhanced superconductivity and moderate spin fluctuations suppressed at low energies in heavily electron-doped La1111-based superconductor
• An investigation of the interrelationship between pressure and correlation in LaFeAsO under pressure
• Effect of spark plasma sintering on the superconducting properties of Sm-based oxypnictide
• Representation-protected topology of spin-singlet $s$-wave superconductors
• Electronic properties and surface states of RbNi${}_2$Se${}_2$
• Change of Fermi surface states related with two different $T_{\mathrm{c}}$-raising mechanisms in iron pnictide superconductor
• Phonon Spectra in the Parent Superconducting Iron-tuned Telluride Fe${}_{1+x}$Te from Inelastic Neutron Scattering and Ab Initio Calculations
• Hidden Kondo lattice physics in single-orbital Hubbard models
• Anisotropic superconductivity and Fermi surface reconstruction in the spin-vortex antiferromagnetic superconductor CaK(Fe${}_{0.95}$Ni${}_{0.05}$)${}_4$As${}_4$
• Hole doping and electronic correlations in Cr-substituted BaFe${}_2$As${}_2$
• Two-Dimensional Phase-Fluctuating Superconductivity in Bulk-Crystalline NdO${}_{0.5}$F${}_{0.5}$BiS${}_2$
• Massive electrons and unconventional room-temperature superconductivity in superhydrides
• Persistent antiferromagnetic order in heavily overdoped Ca${}_{1-x}$La${}_x$FeAs${}_2$
• Fluctuating magnetism of Co- and Cu-doped NaFeAs
• Temperature and doping dependence of normal state spectral properties in a two-orbital model for ferropnictides
• Crossover of Superconductivity across the antiferromagnetic end point in FeSe${}_{1-\mathrm{x}}$S${}_{\mathrm{x}}$ under pressure
• Absence of itinerant ferromagnetism in a cobalt-based oxypnictide
• Supercurrent-induced antiferromagnetic order and spin-triplet pair generation in quantum critical d-wave superconductors
• Effect of Mn Substitution on Superconductivity in PrFeAs(O,F): Role of Magnetic Impurities
• Depairing critical current density and the vortex-free state in FeSe nanobridges
• The calcium doping effects on the structural and electrical properties of NdFeAsO0.8F0.2
• Novel Superconducting SrSnP with Strong Sn-P Antibonding Interaction: Is the Sn Atom Single or Mixed Valent?
• Hidden Ladder in SrMoO${}_3$/SrTiO${}_3$ Superlattices: Experiments and Theoretical Calculations
• Tuning Superconductivity by Isovalent Antimony Substitution in PrFeAs(O,F)
• Growth and microwave properties of FeSe thin films and comparison with Fe(Se,Te)
• Fluorine-substitution-dependent phase diagram and superconducting properties of Sm-based oxypnictides synthesized by a high-pressure growth technique
• Superconductivity above 30 K due to the introduction of oxygen in CaFeAsF
• Isovalent substitution effects of arsenic on structural and electrical properties of iron-based superconductor NdFeAsO0.8F0.2