Iron pnictides as a new setting for quantum criticality

Abstract

Two major themes in the physics of condensed matter are quantum critical phenomena and unconventional superconductivity. These usually occur in the context of competing interactions in systems of strongly-correlated electrons. All this interesting physics comes together in the behavior of the recently discovered iron pnictide compounds that have generated enormous interest because of their moderately high-temperature superconductivity. The ubiquity of antiferromagnetic ordering in their phase diagrams naturally raises the question of the relevance of magnetic quantum criticality, but the answer remains uncertain both theoretically and experimentally. Here we show that the undoped iron pnictides feature a novel type of magnetic quantum critical point, which results from a competition between electronic localization and itinerancy. Our theory provides a mechanism to understand the experimentally-observed variation of the ordered moment among the undoped iron pnictides. We suggest P substitution for As in the undoped iron pnictides as a means to access this new example of magnetic quantum criticality in an unmasked fashion. Our findings point to the iron pnictides as a much-needed new setting for quantum criticality, one that offers a new set of control parameters.

(v3) New abstract, more explanatory material, accepted for PNAS

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Cited by in corpus (123)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• High-temperature superconductivity in iron-based materials
• Antiferromagnetic order and spin dynamics in iron-based superconductors
• High Temperature Superconductivity in Iron Pnictides and Chalcogenides
• Spin Waves and Magnetic Exchange Interactions in CaFe2As2
• Quantum critical point lying beneath the superconducting dome in iron-pnictides
• A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe2(As1-xPx)2
• Superconductivity up to 30 K in the vicinity of quantum critical point in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Orbital-Ordering Induces Structural Phase Transition and the Resistivity Anomaly in Iron Pnictides
• Nematic spin fluid in the tetragonal phase of BaFe2As2
• Strongly Correlated Materials
• Unconventional superconductivity and antiferromagnetic quantum critical behavior in the isovalent-doped BaFe2(As1-xPx)2
• Nematic spin correlations in the tetragonal state of uniaxial strained BaFe2-xNixAs2
• Orbital Ordering and Unfrustrated $(\pi ,0)$ Magnetism from Degenerate Double Exchange in the Iron Pnictides
• Electronic Correlation and Magnetism in the Ferromagnetic Metal Fe3GeTe2
• Orbital-selective Mott Phase in Multiorbital Models for Alkaline Iron Selenides K(1-x)Fe(2-y)Se2
• Magnetoresistance near a quantum critical point
• J_1-J_2 frustrated two-dimensional Heisenberg model: Random phase approximation and functional renormalization group
• Unconventional electronic reconstruction in undoped (Ba,Sr)Fe${}_2$As${}_2$ across the spin density wave transition
• Antiferroquadrupolar and Ising-Nematic Orders of a Frustrated Bilinear-Biquadratic Heisenberg Model and Implications for the Magnetism of FeSe
• Flat bands, strange metals, and the Kondo effect
• Anisotropic in-plane resistivity in the nematic phase of the iron pnictides
• Electronic structure of Fe1.04(Te0.66Se0.34)
• U(1) Slave-spin theory and its application to Mott transition in a multi-orbital model for iron pnictides
• Emergence of superconductivity in the canonical heavy-electron metal YbRh2Si2
• Superconductivity in LaFeAs${}_{1-x}$P${}_x$O: effect of chemical pressures and bond covalency
• Effects of the magnetic orderings on the dynamical conductivity: optical investigations of EuFe${}_2$As${}_2$ single crystals
• Spin fluctuations in iron pnictides and chalcogenides: From antiferromagnetism to superconductivity
• Quantum criticality in the iron pnictides and chalcogenides
• Narrow superconducting window in Ni-doped LaFeAsO
• Pressure Induced Stripe-order Antiferromagnetism and First-order Phase Transition in FeSe
• Orbitally and Magnetically Induced Anisotropy in Iron-based Superconductors
• The Nematic Energy Scale and the Missing Electron Pocket in FeSe
• Electronic Evidence of an Insulator-Superconductor Transition in Single-Layer FeSe/SrTiO3 Films
• Proximity of Iron Pnictide Superconductors to a Quantum Tricritical Point
• Avoided quantum criticality and magnetoelastic coupling in BaFe${}_{2-x}$Ni${}_x$As${}_2$
• Global Phase Diagram for Magnetism and Lattice Distortion of Fe-pnictide Materials
• Quantum oscillation studies of the Fermi surface of iron-pnictide superconductors
• Lattice distortion and magnetic quantum phase transition in CeFeAs(1-x)P(x)O
• Robustness of s-wave Pairing in Electron-Overdoped ${\text{A}}_{1-y}{\text{Fe}}_{2-x}{\text{Se}}_2$
• Orbital-selective superconductivity, gap anisotropy and spin resonance excitations in a multiorbital t-J1-J2 model for iron pnictides
• Correlation effects in the iron pnictides
• Phase diagram of CeFeAs${}_{1-x}$P${}_x$O obtained from electric resistivity, magnetization, and specific heat measurements
• A Tale of Two Metals: contrasting criticalities in the pnictides and hole-doped cuprates
• Shape resonance for the anisotropic superconducting gaps near a Lifshitz transition: the effect of electron hopping between layers
• Quantum criticality in AFe2As2 with A = K, Rb, and Cs suppresses superconductivity
• 20 K superconductivity in heavily electron doped surface layer of FeSe bulk crystal
• Orbital selectivity enhanced by nematic order in FeSe
• The specific heat jump at the superconducting transition and the quantum critical nature of the normal state of Pnictide superconductors
• Spin Dynamics of a J1-J2-K Model for the Paramagnetic Phase of Iron Pnictides
• Electronic Structure, Localization and Spin-State Transition in Cu-substituted FeSe: Fe${}_{1-x}$Cu${}_x$Se
• Tunable Bi-frustrated Electron Spin and Charge States in a Cu-Hexaaminobenzene Framework
• Pressure-induced magnetic transition and volume collapse in FeAs superconductors: An orbital-selective Mott scenario
• Impact of Uniaxial Pressure on Structural and Magnetic Phase Transitions in Electron-Doped Iron Pnictides
• Orbital selectivity in electron correlations and superconducting pairing of iron-based superconductors
• Normal state spin dynamics in the iron-pnictide superconductors BaFe2(As1-xPx)2 and Ba(Fe1-xCox)2As2 probed with NMR measurements
• Orbital-selective superconductivity in the nematic phase of FeSe
• Magnetic and superconducting instabilities in a hybrid model of itinerant/localized electrons for iron pnictides
• Upper critical field and thermally activated flux flow in single crystalline Tl${}_{0.58}$Rb${}_{0.42}$Fe${}_{1.72}$Se${}_2$
• Superconductivity in Multi-orbital t-J1-J2 Model and its Implications for Iron Pnictides
• Evolution of the Phase Diagram of LaFeP${}_{1-x}$As${}_x$O${}_{1-y}$F${}_y$ ($y$ = 0 -- 0.1)
• Hall effect in heavy-fermion metals
• A brief review on muSR studies of unconventional Fe and Cr-based superconductors
• The magnetic phase diagram of an extended J1-J2 model on a modulated square lattice and its implications for the antiferromagnetic phase of KyFexSe2
• S-wave superconductivity with orbital dependent sign change in the checkerboard models of iron-based superconductors
• Signatures of quantum criticality in the thermopower of Ba(Fe(1-x)Co(x))2As2
• The magnetic moment enigma in Fe-based high temperature superconductors
• Electronic nematic correlations in the stress free tetragonal state of BaFe${}_{2-x}$Ni${}_x$As${}_2$
• Relationship between Superconductivity and Antiferromagnetism in LaFe(As${}_{1-x}$P${}_x$)O Revealed by ${}^{31}$P-NMR
• Magnetic property and crystalline electric field effect in ThCr${}_2$Si${}_2$-type CeNi${}_2$As${}_2$
• Non-Fermi-liquid scattering rates and anomalous band dispersion in ferropnictides
• Spin Dynamics of a $J_1-J_2$ Antiferromagnet and its Implications for Iron Pnictides
• Spin-state Crossover Model for the Magnetism of Iron Pnictides
• Magnetic Properties of Ab initio Model for Iron-Based Superconductors LaFeAsO
• Hedgehog Spin-vortex Crystal Antiferromagnetic Quantum Criticality in CaK(Fe1-xNix)4As4 Revealed by NMR
• Spectroscopic Evidence for Strong Quantum Spin Fluctuations with Itinerant Character in YFe2Ge2
• Vortex state in iron-based superconductors with collinear antiferromagnetic cores
• Theory of Point Contact Spectroscopy in Correlated Materials
• Iron-based superconductors: teenage, complex, challenging
• Interplay of composition, structure, magnetism, and superconductivity in SmFeAs1-xPxO1-y
• Orbital-dependent effects of electron correlations in microscopic models for iron-based superconductors
• Broken mirror symmetry, incommensurate spin correlations, and $B_{2g}$ nematic order in iron pnictides
• Evolution of correlation strength in KxFe(2-y)Se2 superconductor doped with S
• Pristine quantum criticality in a Kondo semimetal
• Nematic phase without Heisenberg physics in FeAs planes
• Field tuned critical fluctuations in YFe2Al10: Evidence from magnetization, 27Al (NMR, NQR) investigations
• Spin and quadrupolar orders in the spin-1 bilinear-biquadratic model for iron-based superconductors
• Spin excitations and the Fermi surface of superconducting FeS
• Electronic Nematicity Revealed by Torque Magnetometry in Iron Arsenide EuFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Fermi surface evolution through a heavy fermion superconductor-to-antiferromagnet transition: de Haas-van Alphen effect in Cd-substituted CeCoIn${}_5$
• Pressure-temperature phase diagrams of CaK(Fe${}_{1-x}$Ni${}_x$)${}_4$As${}_4$ superconductors
• Exchange striction driven magnetodielectric effect and potential photovoltaic effect in polar CaOFeS
• Effective Exchange Interactions for Bad Metals and Implications for Iron-based Superconductors
• Strong-Correlation Derived Spin-Fermion Model for Skyrmions in MnGe
• Spectral Evidence for Emergent Order in Ba${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$
• Magnetic and Structural Properties of the Iron Oxychalcogenides La${}_2$O${}_2$Fe${}_2$O$M_2$ ($M$= S, Se)
• In-plane anisotropy of transport coefficients in the electronic nematic states: Universal origin of the nematicity in Fe-based superconductors
• Pressure-induced superconductivity in EuFe2As2 without a quantum critical point: magnetotransport and upper critical field measurements under high pressure
• Increasing stripe-type fluctuations in $A$Fe${}_2$As${}_2$ ($A$ = K, Rb, Cs) superconductors probed by ${}^{75}$As NMR spectroscopy
• Transitions from a Kondo-like diamagnetic insulator into a modulated ferromagnetic metal in ${\mathrm{FeGa}}_{3-\mathbf{y}}{\mathrm{Ge}}_{\mathbf{y}}$
• Density Matrix Renormalization Group Study of Nematicity in Two Dimensions: Application to a Spin-$1$ Bilinear-Biquadratic Model on the Square Lattice
• Local dynamics and thermal activation in the transverse-field Ising chain
• $B_{1g}$-like pairing states in two-leg ladder iron superconductors
• Orbital Nematic Order and Interplay with Magnetism in the Two-Orbital Hubbard Model
• Kagome materials $A$V${}_3$Sb${}_5$ ($A$=K,Rb,Cs): pairing symmetry and pressure-tuning studies
• Electron Correlation and Spin Dynamics in Iron Pnictides and Chalcogenides
• Revealing the degree of magnetic frustration by non-magnetic impurities
• Coexistence of antiferromagnetism and topological superconductivity on the honeycomb lattice Hubbard model
• Electronic structure and quantum criticality in Ba(Fe${}_{1-x-y}$Co${}_x$Mn${}_y$)${}_2$As${}_2$, an ARPES study
• Magnetic and Ising quantum phase transitions in a model for isoelectronically tuned iron pnictides
• Anisotropic magnetic excitations of a frustrated bilinear-biquadratic spin model -- Implications for spin waves of detwinned iron pnictides
• Magnetic and Quasiparticle Excitation Spectra of an Itinerant $J_1-J_2$ Model for Iron Pnictide Superconductors
• Electronic and magnetic properties of orthorhombic iron selenide (FeSe)
• Anomalous sharp peak in the London penetration depth induced by the nodeless-to-nodal superconducting transition in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Interplay between Fe 3d and Ce 4f magnetism and Kondo interaction in CeFeAs_{1-x}P_{x}O probed by ^{75}As and ^{31}P NMR
• Doping dependence and electron-boson coupling in the ultrafast relaxation of hot electron populations in Ba(Fe_{1-x}Co_x)_2As_2
• Nematic fluctuations in the non-superconducting iron pnictide BaFe${}_{1.9-x}$Ni${}_{0.1}$Cr${}_x$As${}_2$
• Fermi surface evolution and checker-board block-spin antiferromagnetism in $A_x$Fe${}_{2-y}$Se${}_2$
• Pressure-temperature phase diagram of CaK(Fe${}_{1-x}$Mn${}_x$)${}_4$As${}_4$ for $x$=0.024
• Dynamical charge and spin density wave scattering in cuprate superconductor
• Pressure-Induced Superconductivity and Its Scaling with Doping-Induced Superconductivity in the Iron Pnictide with Skutterudite Intermediary Layers
• Superconducting states of a J1-J2-K model for iron pnictides
• Localized and itinerant dichotomy of electrons in Ba(Fe,Co)2As2