High Temperature Superconductivity in Iron Pnictides and Chalcogenides

Abstract

Superconductivity develops in metals upon the formation of a coherent macroscopic quantum state of electron pairs. Iron pnictides and chalcogenides are materials that have high superconducting transition temperatures. In this Review, we describe the advances in the field that have led to higher superconducting transition temperatures in iron-based superconductors and the wide range of materials that form them. We summarize both the essential aspects of the normal state and the mechanism for superconductivity. We emphasize the degree of electron-electron correlations and their manifestation in properties of the normal state. We examine the nature of magnetism, analyse its role in driving the electronic nematicity, and discuss quantum criticality at the border of magnetism in the phase diagram. Finally, we review the amplitude and structure of the superconducting pairing, and survey the potential settings for optimizing superconductivity.

Review article commissioned by Nature Reviews Materials, and intended for general readers. 41 pages, 7 figures. A slightly shortened version, with redrawn figures, has been published in the journal

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• Finite Temperature Auxiliary Field Quantum Monte Carlo in the Canonical Ensemble
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• Effect of electron correlations on the electronic structure and phase stability of FeSe upon lattice expansion
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• Lifshitz transition enabling superconducting dome around the quantum critical point in TiSe${}_2$
• Complex structure due to As bonding and interplay with electronic structure in superconducting BaNi2As2
• Spin-isotropic continuum of spin excitations in antiferromagnetically ordered Fe${}_{1.07}$Te
• Anisotropic magnetic excitations of a frustrated bilinear-biquadratic spin model -- Implications for spin waves of detwinned iron pnictides
• Theory Perspective: SCES 2016
• Local Structure of Mott Insulating Iron Oxychalcogenides La${}_2$O${}_2$Fe${}_2$O$M$${}_2$ ($M$ = S, Se)
• Comparison of Gd addition effect on the superconducting properties of FeSe0.5Te0.5 bulks under ambient and high-pressure conditions
• The splitting of electrons and violation of the Luttinger sum rule
• Quantum Criticality Enabled by Intertwined Degrees of Freedom
• Orbital-selective correlations and renormalized electronic structure in LiFeAs
• Putative hybridization gap in CaMn${}_2$Bi${}_2$ under applied pressure
• Fulde-Ferrell-Larkin-Ovchinnikov state in strongly correlated d-wave superconductors
• Spontaneous layer selective Mott phase in the bilayer Hubbard model
• Probing hidden Mott gap and incommensurate charge modulation on the polar surfaces of PdCrO${}_2$
• Observation of a C-type short range antiferromagnetic order in expanded FeS
• A mean-field approach to Kondo-attractive-Hubbard model
• Domes of $T_c$ in single-band and multiband superconductors with finite-range attractive interactions
• Nodal-to-nodeless superconducting order parameter in LaFeAs${}_{1-x}$P${}_x$O synthesized under high pressure
• Superconducting Order Parameters in overdoped BaFe${}_{1.86}$Ni${}_{0.14}$As${}_2$ Revealed by Multiple Andreev Reflection Spectroscopy of Planar Break-Junctions
• Vibrational anomalies in AFe${}_2$As${}_2$ (A$=$Ca, Sr, and Ba) single crystals
• Rise and Fall of Non-Fermi Liquid Fixed Points in Multipolar Kondo Problems
• Superconductivity in a Topological Lattice Model with Strong Repulsion
• Identifying the dominant pairing interaction in high-$T_c$ FeSe superconductors through Leggett modes
• On the size of superconducting islands on the density-wave background in organic metals
• Unconventional superconductivity in a strongly correlated band-insulator without doping
• Effect of electron doping in FeTe${}_{1-y}$Se${}_y$ realized by Co and Ni substitution
• Evidence of a multiple boson emission in Sm${}_{1-x}$Th${}_x$OFeAs
• Nematic fluctuations in the non-superconducting iron pnictide BaFe${}_{1.9-x}$Ni${}_{0.1}$Cr${}_x$As${}_2$
• Cu doping effects on the electronic structure of Fe1-xCuxSe
• Uniaxial stress effect on the electronic structure of quantum materials
• Data analysis of $ab$ $initio$ effective Hamiltonians in iron-based superconductors $\unicode{x2014}$ Construction of predictors for superconducting critical temperature
• High-pressure growth effects on the superconducting properties of Sm-based oxypnictide superconductors
• Spin dynamics in NaFeAs and NaFe${}_{0.53}$Cu${}_{0.47}$As probed by resonant inelastic X-ray scattering
• Superconductivity with Tc=7 K under pressure for Cu-, and Au-doped BaFe2As2
• Antimony Doping Effect on the Superconducting Properties of SmFeAs(O,F)
• Anomalous Field-Temperature Phase Diagram of Superconductivity in Sn-Pb Solder
• Interplay between Multipolar Order and Multipole-Induced Superconductivity in PrTi${}_2$Al${}_{20}$
• Superconductivity and phonon self-energy effects in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$
• Magnetism of competing high-spin/low-spin states in Ba${}_2$NiO${}_2$(AgSe)${}_2$ and related two-orbital two-electron systems
• Application of SQUIDs to low temperature and high magnetic field measurements - Ultra low noise torque magnetometry
• Electronic Correlations and Absence of Superconductivity in the Collapsed Phase of LaFe${}_2$As${}_2$
• Direct observation of the spin exciton in Andreev spectroscopy of iron-based superconductors
• Unusual band splitting and superconducting gap evolution with sulfur substitution in FeSe
• Mössbauer studies of spin- and charge-modulations in BaFe2(As1-xPx)2
• First-order phase transition between superconductivity and charge/spin-density wave as the reason of their coexistence in organic metals
• Identifying materials with charge-spin physics using charge-spin susceptibility computed from first principles
• High-pressure growth effect on the properties of high-Tc iron-based superconductors: A short review
• Structural and Physical Properties of the Heavy Fermion Metal Ce${}_2$NiAl${}_6$Si${}_5$
• Pressure tuning of localization and superconductivity in LaOPbBiS${}_3$ and La${}_2$O${}_2$Bi${}_3$AgS${}_6$
• High-entropy magnetism of murunskite
• Enhanced low-energy magnetic excitations evidencing the Cu-induced localization in an Fe-based superconductor Fe${}_{0.98}$Te${}_{0.5}$Se${}_{0.5}$
• Strong electron-boson coupling in the iron-based superconductor BaFe1.9Pt0.1As2 revealed by infrared spectroscopy
• Quantum order by disorder in Frustrated Spin Nanotubes
• Critical local moment fluctuations and enhanced pairing correlations in a cluster Anderson model
• Optimization of Synthesis Parameters and Superconducting Properties of GdFeAsO1-xFx
• Free energy and metastable states in the square-lattice $J_1$-$J_2$ Ising model
• Praseodymium doping effect on the superconducting properties of FeSe${}_{0.5}$Te${}_{0.5}$ bulks under ambient and high-pressure growth conditions
• Spin correlations in the parent phase of Li${}_{1-x}$Fe${}_x$ODFeSe
• Superconductivity at 12 K in La${}_2$IOs${}_2$: a 5d metal with osmium honeycomb layer
• Self-consistent and Maxwell approximations to describe the excess conductivity anisotropy in FeSe above superconducting transition temperature
• Preformed Cooper Pairs in a Triclinic Iron Pnictide Superconductor
• Effect of strain-induced orbital splitting on the magnetic excitations in undoped cuprates
• Orbital-selective electron correlations in high-$T_{\mathrm{c}}$ bilayer nickelates: from a global phase diagram to implications for spectroscopy
• Neutron powder diffraction study on the non-superconducting phases of ThFeAsN${}_{1-x}$O${}_x$ ($x=0.15,0.6$) iron pnictide
• Frustrated phonon with charge density wave in vanadium Kagome metal
• Spin fluctuations in the 112-type iron-based superconductor Ca${}_{0.82}$La${}_{0.18}$Fe${}_{0.96}$Ni${}_{0.04}$As${}_2$
• Spin pumping effect in non-Fermi liquid metals
• Temperature-dependent local structure of superconducting BaPd${}_2$As${}_2$ and SrPd${}_2$As${}_2$
• Dynamical Coulomb Blockade as a Signature of the Sign-Reversing Cooper Pairing Potential
• Cuprates, Pnictides and Sulfosalts: Lessons in Functional Materials
• Spin dynamics in itinerant antiferromagnet SrCr${}_2$As${}_2$
• Triplet pairing, orbital selectivity and correlations in Iron-based superconductors
• Strong correlation between $H$-linear magnetoresistance and strange metal in FeSe superconductor
• Spin wave approach to the two-magnon Raman scattering in an J1x-J1y-J2-Jc antiferromagnetic Heisenberg model
• Magnetically-induced local lattice anomalies and low-frequency nematic fluctuations in the Mott insulator La${}_2$O${}_3$Fe${}_2$Se${}_2$
• Dual Enhancement of Superconductivity in FeSe/SrTiO3 via Orbital and Correlation Synergy
• Peculiar effect of sample size in layered superconductors
• Twinning of domains and spin anisotropy in K${}_5$Fe${}_4$Ag${}_6$Te${}_{10}$
• Evolution from three-dimensional charge density wave to one-dimensional stripe order in CsV${}_{3-x}$Ti${}_x$Sb${}_5$
• Synthesis and characterizations of arsenic doped FeSe bulks
• Quasi-one-dimensional spin excitations in the iron pnictide NaFe${}_{0.53}$Cu${}_{0.47}$As
• Interference Effect of Beam Splitter Current in Iron-Pnictide Superconductors