Why Does Undoped FeSe Become A High Tc Superconductor Under Pressure?

Abstract

Unlike the parent phases of the iron-arsenide high Tc superconductors, undoped FeSe is not magnetically ordered and exhibits superconductivity with Tc~9K. Equally surprising is the fact that applied pressure dramatically enhances the modest Tc to ~37K. We investigate the electronic properties of FeSe using 77Se NMR to search for the key to the superconducting mechanism. We demonstrate that the electronic properties of FeSe are very similar to those of electron-doped FeAs superconductors, and that antiferromagnetic spin fluctuations are strongly enhanced near Tc. Furthermore, applied pressure enhances spin fluctuations. Our findings suggest a link between spin fluctuations and the superconducting mechanism in FeSe.

Accepted for publication in Phys. Rev. Lett. after minor revision

References in corpus (15)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• Density functional study of FeS, FeSe and FeTe: Electronic structure, magnetism, phonons and superconductivity
• Superconductivity at 27 K in tetragonal FeSe under high pressure
• Extreme Sensitivity of Superconductivity to Stoichiometry in FeSe (Fe1+dSe)
• Evolution from Itinerant Antiferromagnet to Unconventional Superconductor with Fluorine Doping in La(O_{1-x}F_{x})FeAs Revealed by ^{75}As and ^{139}La Nuclear Magnetic Resonance
• Commensurate Itinerant Antiferromagnetism in BaFe2As2: 75As-NMR Studies on a Self-Flux Grown Single Crystal
• Spin susceptibility, phase diagram, and quantum criticality in the electron-doped high Tc Superconductor Ba[Fe(1-x)Co(x)]2As2
• 19-F NMR Investigation of Iron-pnictide Superconductor LaFeAsO(0.89)F(0.11)
• Glassy Slowing of Stripe Modulation in (La,Eu,Nd)(2-x)(Sr,Ba)(x)CuO4: A Cu-63 and La-139 NQR Study Down to 350mK
• 59-Co and 75-As NMR Investigation of Electron-Doped High Tc Superconductor BaFe(1.8)Co(0.2)As(2) (Tc = 22K)
• Evidence for Unconventional Superconductivity in Arsenic-Free Iron-Based Superconductor FeSe : A ^77Se-NMR Study
• 59Co and 75As NMR Investigation of the Lightly Doped Ba[Fe(1-x)Co(x)]2As2 (x =0.02, 0.04)
• Electronic properties of LaOFFeAs in the normal state probed by NMR/NQR

Cited by in corpus (215)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Superconductivity in Iron Compounds
• A Common Thread: the pairing interaction for the unconventional superconductors
• Superconductivity at 36 K in beta-Fe1.01Se with the compression of the interlayer separation under pressure
• Pressure evolution of low-temperature crystal structure and bonding of 37 K $T_c$ FeSe superconductor
• The Structural Phase Transition in FeSe (Fe1+dSe)
• Iron-Based Superconductors: current status of materials and pairing mechanism
• Orbital-driven nematicity in FeSe
• A review of Fe-chalcogenide superconductors: the simplest Fe-based superconductor
• Dome-shaped magnetic order competing with high-temperature superconductivity at high pressures in FeSe
• Reconstruction of Band Structure Induced by Electronic Nematicity in an FeSe Superconductor
• Charge carrier localization induced by excess Fe in the Fe1+y(Te,Se) superconductor system
• Origin of the tetragonal-to-orthorhombic (nematic) phase transition in FeSe: a combined thermodynamic and NMR study
• Theoretical evidence for strong correlations and incoherent metallic state in FeSe
• Lack of coupling between superconductivity and orthorhombic distortion in stoichiometric single-crystalline FeSe
• Lifting of xz/yz orbital degeneracy at the structural transition in detwinned FeSe
• Iron based superconductors: magnetism, superconductivity and electronic structure
• Nematicity, magnetism and superconductivity in FeSe
• Unconventional superconductivity and antiferromagnetic quantum critical behavior in the isovalent-doped BaFe2(As1-xPx)2
• Pressure Induced Static Magnetic Order in Superconducting FeSe_1-x
• Superconductivity in iron telluride thin films under tensile stress
• Using Gap Symmetry and Structure to Reveal the Pairing Mechanism in Fe-based Superconductors
• Phase diagram and Gap anisotropy in Iron-Pnictide Superconductors
• Pressure-induced high-Tc superconducting phase in FeSe: correlation between anion height and Tc
• Coexistence of Superconductivity and Magnetism in FeSe_1-x under Pressure
• Precise Pressure Dependence of the Superconducting Transition Temperature of FeSe: Resistivity and ^77Se--NMR Study
• Antiferroquadrupolar and Ising-Nematic Orders of a Frustrated Bilinear-Biquadratic Heisenberg Model and Implications for the Magnetism of FeSe
• Strong cooperative coupling of pressure-induced magnetic order and nematicity in FeSe
• Electronic Structure and Superconductivity of FeSe-Related Superconductors
• Exotic Superconducting States in FeSe-based Materials
• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Momentum-dependent sign-inversion of orbital polarization in superconducting FeSe
• Crystal orientation and thickness dependence of superconductivity on tetragonal FeSe1-x thin films
• The origin of nematic order in FeSe
• Observation of Double-Dome Superconductivity in Potassium-Doped FeSe Thin Films
• Electronic nematic susceptibility of iron-based superconductors
• Charge Nematicity and Electronic Raman Scattering in Iron-based Superconductors
• Suppression of orbital ordering by chemical pressure in FeSe1-xSx
• Interplay between magnetism and superconductivity in iron-chalcogenide superconductors: crystal growth and characterizations
• Evolution of two-gap behavior of the superconductor FeSe_1-x
• Charge induced nematicity in FeSe
• Evidence for an FFLO state with segmented vortices in the BCS-BEC-crossover superconductor FeSe
• Pressure-induced antiferromagnetic transition and phase diagram in FeSe
• Superconducting properties of sulfur-doped iron selenide
• Highly Anisotropic Superconducting Gap in Nematically Ordered and Tetragonal Phases of FeSe${}_{1-x}$S${}_x$
• High-Tc superconductivity in FeSe at high pressure: Dominant hole carriers and enhanced spin fluctuations
• Strong Pressure Dependent Electron-Phonon Coupling in FeSe
• Large electron-phonon interactions from FeSe phonons in a monolayer
• Theory of Cross Phenomena and Their Coefficients Beyond Onsager Theorem
• Strong anisotropy in nearly ideal-tetrahedral superconducting FeS single crystals
• Pressure Induced Stripe-order Antiferromagnetism and First-order Phase Transition in FeSe
• Local density of states and superconducting gap in the iron chalcogenide superconductor Fe${}_{1+\delta }$Se${}_{1-x}$Te${}_x$ observed by scanning tunneling spectroscopy
• Metal - Insulator transition in Fe1.01-xCuxSe
• 77Se NMR Investigation of the K(x)Fe(2-y)Se(2) High Tc Superconductor (Tc=33K)
• High-temperature superconductivity in one-unit-cell FeSe films
• London penetration depth and superfluid density in single crystals of Fe(Te,Se) and Fe(Te,S) superconductors
• Quasiparticle dynamics and phonon softening in FeSe superconductors
• The intercalation chemistry of layered iron chalcogenide superconductors
• Quenched nematic criticality separating two superconducting domes in an iron-based superconductor under pressure
• Atomically Resolved FeSe/SrTiO3(001) Interface Structure by Scanning Transmission Electron Microscopy
• Quantum oscillations and upper critical magnetic field of the iron-based superconductor FeSe
• A perspective on pnictide superconductors
• 77Se NMR study of pairing symmetry and spin dynamics in KyFe2-xSe2
• Synthesis, crystal structure and magnetism of beta-Fe1.00(2)Se1.00(3) single crystals
• Interplay between lattice and spin states degree of freedom in the FeSe superconductor: dynamic spin state instabilities
• The phase diagrams of iron-based superconductors: theory and experiments
• Non-monotonic pressure evolution of the upper critical field in superconducting FeSe
• Superconducting gap structure of FeSe
• Moisture-induced superconductivity in FeTe0.8S0.2
• Thin Film Growth and Device Fabrication of Iron-Based Superconductors
• Stripe antiferromagnetic correlations in LaFeAsO1-xFx probed by 75As NMR
• Detection of an Unconventional Superconducting Phase in the Vicinity of the Strong First-Order Magnetic Transition in CrAs Using ^75As-Nuclear Quadrupole Resonance
• Calorimetric Evidence of Strong-Coupling Multiband Superconductivity in Fe(Te0.57Se0.43) Single Crystal
• Correlation between Superconductivity and Magnetic Fluctuations in Fe(Se1-xSx) Revealed by 77Se NMR
• Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx
• Superconductivity and magnetism in Iron Sulfides Intercalated by Metal Hydroxides
• Synthesis and Crystal Growth of Tetragonal Fe1.00Se
• Spin excitations in a model of FeSe with orbital ordering
• Electron correlation in FeSe superconductor studied by bulk-sensitive photoemission spectroscopy
• The role of double TiO2 layers at the interface of FeSe/SrTiO3 superconductors
• Emergence of an incipient ordering mode in FeSe
• Fermi surface reconstruction in FeSe under high pressure
• NMR investigation of superconductivity and antiferromagnetism in CaFe${}_2$As${}_2$ under pressure
• Electronic Structure, Localization and Spin-State Transition in Cu-substituted FeSe: Fe${}_{1-x}$Cu${}_x$Se
• Density of Phonon States in Superconducting FeSe as a Function of Temperature and Pressure
• Contrasting Pressure Effects in Sr2VFeAsO3 and Sr2ScFePO3
• Specific-heat study of superconducting and normal states in FeSe1-xTex (0.6<=x<=1) single crystals: Strong-coupling superconductivity, strong electron-correlation, and inhomogeneity
• Sr${}_2$VO${}_3$FeAs: A Nanolayered Bimetallic Iron Pnictide Superconductor
• The Electronic Phase Diagram of the Iron-based High Tc Superconductor Ba(Fe(1-x)Co(x))2As2 Under Hydrostatic Pressure (0 < x <0.099)
• Imaging the Electron-Boson Coupling in Superconducting FeSe
• Gap opening and orbital modification of superconducting FeSe above the structural distortion
• NMR evidence for static local nematicity and its cooperative interplay with low-energy magnetic fluctuations in FeSe under pressure
• Interplay of nematic and magnetic orders in FeSe under pressure
• Coexistence of low moment magnetism and superconductivity in tetragonal FeS and suppression of $T_{\mathrm{c}}$ under pressure
• Mossbauer studies on FeSe and FeTe
• The preparation and phase diagrams of (${}^7$Li${}_{1-x}$Fe${}_x$OD)FeSe and (Li${}_{1-x}$Fe${}_x$OH)FeSe superconductors
• Structural, Magnetic and Electronic Properties of the Iron-Chalcogenide A${}_x$Fe${}_{2-y}$Se${}_2$ (A=K, Cs, Rb, Tl and etc.) Superconductors
• Odd parity pairing and nodeless anti-phase $s^{\pm }$ in Iron-Based Superconductors
• Nematicity, magnetism and superconductivity in FeSe under pressure: Unified explanation based on the self-consistent vertex correction theory
• Progressive slowing down of spin fluctuations in underdoped LaFeAsO${}_{1-x}$F${}_x$
• Synthesis and Physical Properties of FeSe1/2Te1/2 Superconductor
• Superfluid density and microwave conductivity of FeSe superconductor: ultra-long-lived quasiparticles and extended s-wave energy gap
• Competing collinear magnetic structures in superconducting FeSe by first principles quantum Monte Carlo calculations
• Anomalous Pressure Dependence of the Superconducting Transition Temperature in FeSe1-x Studied by DC Magnetic Measurements
• Resistivity and magnetoresistance of FeSe single crystals under Helium-gas pressure
• Possible Superconducting Symmetry and Magnetic Correlations in K0.8Fe2Se2: A 77Se-NMR Study
• Magnetotransport study of the pressure-induced antiferromagnetic phase in FeSe
• Pressure effect on superconductivity of $A_x$Fe${}_2$Se${}_2$ ($A$ = K and Cs)
• Nematic antiferromagnetic states in bulk FeSe
• Superconductivity-enhanced Nematicity and '$s+d$' Gap Symmetry in Fe(Se${}_{1-x}$S${}_x$)
• Temperature-dependent transformation of the magnetic excitation spectrum on approaching superconductivity in Fe1-x (Ni/Cu)x Te0.5 Se0.5
• Identification of prototypical Brinkman-Rice Mott physics in a class of iron chalcogenides superconductors
• The substitution effects on electronic structure of iron selenide superconductors
• Separate tuning of nematicity and spin fluctuations to unravel the origin of superconductivity in FeSe
• Hole-doping-induced melting of spin-state ordering in PrBaCo2O5.5+x
• Weakening of the diamagnetic shielding in FeSe${}_{1-x}$S${}_x$ at high pressures
• Mott-Kondo Insulator Behavior in the Iron Oxychalcogenides
• 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
• Eliashberg theory for spin-fluctuations mediated superconductivity -- Application to bulk and monolayer FeSe
• Quasiparticle Excitations in the Superconducting State of FeSe Probed by Thermal Hall Conductivity in the Vicinity of the BCS-BEC Crossover
• The influence of spin-phonon coupling on antiferromagnetic spin fluctuations in FeSe under pressure: the First-principles calculations with van der Waals corrections
• Fabrication of FeSe1-x superconducting films with bulk properties
• Two-electronic component behavior in the multiband FeSe${}_{0.42}$Te${}_{0.58}$ superconductor
• Theoretical study of impurity-induced magnetism in FeSe
• Pressure induced magnetic order in FeSe
• Strain effects on electronic structure of the iron selenide superconductor
• Simultaneous optimization of spin fluctuations and superconductivity under pressure in an iron-based superconductor
• Critical Behavior of the SDW Transition in Underdoped Ba(Fe1-xCox)2As2 (x <=0.05): 75As NMR Investigation
• Photoinduced ultrafast dynamics of local nematicity and lattice distortions in FeSe crystals
• Nearly-critical spin and charge fluctuations in KFe2As2 observed by high-pressure NMR
• Antiferroquadrupolar order and rotational symmetry breaking in a generalized bilinear-biquadratic model on a square lattice
• Impurity-induced bound states inside the superconducting gap of FeSe
• Impact of Nematicity on the Relationship between Antiferromagnetic Fluctuations and Superconductivity in FeSe0.91S0.09 Under Pressure
• Local spin fluctuations in iron-based superconductors: 77Se and 87Rb NMR measurements of Tl0.47Rb0.34Fe1.63Se2
• Visualization of local magnetic moments emerging from impurities in the Hund's metal states of FeSe
• NMR investigation of spin correlations in BaCo2As2
• Superconductivity in PbO-type Fe chalcogenides
• Enhanced superconducting transition temperature in hyper-interlayer-expanded FeSe despite the suppressed electronic nematic order and spin fluctuations
• Strain effects on the electronic structure of the FeSe0.5Te0.5 superconductor
• Superconductivity and normal state properties of single-crystalline Tl0.47Rb0.34Fe1.63Se2 as seen via 77Se and 87Rb NMR
• MAGNETIC ANOMALY IN SUPERCONDUCTING FeSe
• Thermal evolution of antiferromagnetic correlations and tetrahedral bond angles in superconducting FeTe${}_{1-x}$Se${}_x$
• Multichannel superconductivity of monolayer FeSe on SrTiO${}_3$: Interplay of spin fluctuations and electron-phonon interaction
• Influence of disorder on the signature of pseudogap and multigap superconducting behavior in FeSe
• Synthesis, phase stability, structural and physical properties of 11-type iron chalcogenides
• Disorder-dependent superconducting phase-diagram at high magnetic fields in Fe${}_{1+y}$Se${}_x$Te${}_{1-x}$ ($x\sim 0.4$)
• First-principles theory of electron-spin fluctuation coupling and superconducting instabilities in iron selenide
• Intercalation effect on hyperfine parameters of Fe in FeSe superconductor with Tc = 42 K
• Coexistence of superconductivity and magnetism in K0.8Fe2Se1.4S0.4
• Synthesis, structural and physical properties of ${\delta }^{\prime }$-FeSe${}_{1-x}$
• ${}^{77}$Se-NMR Study under Pressure on 12%-S Doped FeSe
• Review of nuclear magnetic resonance studies on iron-based superconductors
• Ab initio prediction of pressure-induced structural phase transition of superconducting FeSe
• Single crystal growth and structural characterization of FeTe1-xSx
• Pressure dependence of the low- temperature crystal structure and phase transition behaviour of CaFeAsF and SrFeAsF: A synchrotron x-ray diffraction study
• Nematic magnetoelastic effect contrasted between Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ and FeSe
• Pressure-induced superconductivity in palladium sulfide
• Role of interstitial "caged" Fe in the superconductivity of FeTe1/2Se1/2
• Exploration of iron-chalcogenide superconductors
• Inhomogeneous Knight shift in vortex cores of superconducting FeSe
• NMR evidence for an intimate relationship between antiferromagnetic spin fluctuations and extended s-wave superconductivity in mono-crystalline SrFe2(As_{1-x}P_{x})2
• Nematic state of the FeSe superconductor
• High-Tc Nodeless s_\pm-wave Superconductivity in (Y,La)FeAsO_{1-y} with Tc=50 K: 75As-NMR Study
• The Superconducting Transition Temperatures of Fe1+xSe1--y, Fe1+xSe1--yTey and (K/Rb/Cs)zFe2--xSe2
• Intrinsic pinning property of FeSe0.5Te0.5
• Observation of orbital ordering and origin of the nematic order in FeSe
• NMR Investigation of the iron-based superconductors Ca4(Mg,Ti)3Fe2As2O8-y and Ca5(Sc,Ti)4Fe2As2O11-y
• Pressure effect on superconductivity in FeSe0.5Te0.5
• Magnetic neutron scattering studies on the Fe-based superconductor system Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• First-principles study of FeSe epitaxial films on SrTiO3
• Role of the Extra-Fe in K2-xFe4+ySe5 superconductors
• Interrelationships between nematicity, antiferromagnetic spin fluctuations and superconductivity: Role of hotspots in FeSe${}_{1-x}$S${}_x$ revealed by high pressure ${}^{77}$Se NMR study
• Fermi surface, pressure-induced antiferromagnetic order, and superconductivity in FeSe
• Band-filling and correlation controlling electronic properties and magnetism in K${}_x$Fe${}_{2-y}$Se${}_2$: A slave boson study
• Tuning the interplay between nematicity and spin fluctuations in Na${}_{1-x}$Li${}_x$FeAs superconductors
• Suppression of Superconductivity and Nematic Order in Fe${}_{1-y}$Se${}_{1-x}$S${}_x$ (0$\le$$x$$\le$1, $y$$\le$0.1) Crystals by Anion Height Disorder
• Interplay of superconductivity and magnetism in FeSe${}_{1-x}$Te${}_x$ compounds. Pressure effects
• High-throughput investigation of tunable superconductivity in FeSe films
• Piezomagnetism of FeSe single crystals
• Structure, superconductivity, and magnetism in Rb1-xFe1.6Se2-zSz
• Charge carrier dynamics of FeSe thin film investigated by terahertz magneto-optical spectroscopy
• Electronic origin of structural transition in 122 Fe based superconductors
• Magnetism and Superconductivity of S-substituted FeTe
• Theoretical study on the correlation between the spin fluctuation and $T_c$ in the isovalent-doped 1111 iron-based superconductors
• Magnetic correlations in the pressure-induced superconductor CrAs investigated by ${}^{75}$As nuclear magnetic resonance
• Pressure-induced magnetic collapse and metallization of $\mathrm{TlF}{\mathrm{e}}_{1.6}\mathrm{S}{\mathrm{e}}_2$
• Phase transitions in a frustrated biquadratic Heisenberg model with coupled orbital degree of freedom for iron-based superconductors
• Electronic structure of ruthenium-doped iron chalcogenides
• Theory of Magnetic Fluctuations in Iron Pnictides
• NMR Characterization of Sulphur Substitution Effects in the K(x)Fe(2-y)Se(2-z)S(z) high Tc Superconductor
• Weak Spin Fluctuation with Finite Wave Vector and Superconducting Gap Symmetry in KxFe2-ySe2: 77Se Nuclear Magnetic Resonance
• 31P NMR Investigation of the Superconductor LiFeP (Tc = 5 K)
• Two new parent compounds for FeSe-based superconducting phases
• Conductance spectrum and superconducting gap structures observed in c-axis FeSe0.3Te0.7/Au junctions
• Unconventional superconductivity induced by suppressing an iron-selenium based Mott insulator CsFe4-xSe4
• Tuning the magnetism of the top-layer FeAs on BaFe${}_2$As${}_2$(001): First-principles study
• Pressure-induced transitions in FePS${}_3$: Structural, magnetic and electronic properties
• Superconductivity Near a Quantum Critical Point in Ba(Fe,Co)2As2
• Studies of superconductivity of Fe chalcogenides in films grown by PLD technique
• The local atomic structure of superconducting Fe-Se-Te
• LaO as a candidate substrate for realizing superconductivity in FeSe epitaxial film
• Impact of atomic defects in the electronic states of FeSe${}_{1-x}$S${}_x$ superconducting crystals
• Two-step phase transitions in Fe(Se,Te)
• Strong correlation between $H$-linear magnetoresistance and strange metal in FeSe superconductor
• Dynamics of orbital degrees of freedom probed via isotope ${}^{121,123}$ Sb nuclear quadrupole moments in Sb-substituted iron-pnictide superconductors
• Magnetotransport studies of FeSe under hydrostatic pressure
• Decoupled nematic and magnetic criticality in FeSe${}_{1-x}$S${}_x$
• Spin-nematic order induced superconductivity
• Stripe Antiferromagnetic Ground-State Configuration of FeSe Revealed by Density Functional Theory
• Structural, elastic, optoelectronic and transport properties of Sr3SnO under pressure
• Microscopic Description of Unconventional Nodal Superconductivity in FeSe
• Tripling of the Superconducting Critical Current Density in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ Retained After Pressure Release
• On the bad metallicity and phase diagrams of Fe${}_{1+\delta }X$ ($X$ =Te, Se, S, solid solutions): an electrical resistivity study
• Fragile pressure-induced magnetism in FeSe superconductors with a thickness reduction
• Short-lived electron excitations in $\mathrm{FeT}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{S}{\mathrm{e}}_{\mathrm{x}}$ as revealed by microwave absorption