Competing Orders and Spin-Density-Wave Instability in La(O${}_{1-x}$F${}_x$)FeAs

Abstract

The interplay between different ordered phases, such as superconducting, charge or spin ordered phases, is of central interest in condensed matter physics. The very recent discovery of superconductivity with a remarkable T${}_c$= 26 K in Fe-based oxypnictide La(O${}_{1-x}$F${}_x$)FeAs is a surprise to the scientific community\cite{Kamihara08}. The pure LaOFeAs itself is not superconducting but shows an anomaly near 150 K in both resistivity and dc magnetic susceptibility. Here we provide combined experimental and theoretical evidences showing that the anomaly is caused by the spin-density-wave (SDW) instability, and electron-doping by F suppresses the SDW instability and recovers the superconductivity. Therefore, the La(O${}_{1-x}$F${}_x$)FeAs offers an exciting new system showing competing orders in layered compounds.

4 pages, 4 figures

References in corpus (2)

• Correlated electronic structure of LaOFeAs
• Doping-dependent Phase Diagram of LaO{\it M}As ({\it M}=V--Cu) and Electron-type Superconductivity near Ferromagnetic Instability

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• Comparative study on the thermoelectric effect of parent oxypnictides La$T$AsO ($T$ = Fe, Ni)
• Electronic structure, lattice dynamics and magnetism of new ThXAsN (X=Fe,Co,Ni) superconductors: A First Principles Study
• A Unified Description of Cuprate and Iron Arsenide Superconductors
• Structural and Physical Properties of CaFe4As3 Single Crystals
• Lattice anomalies in the FeAs${}_4$ tetrahedra of the NdFeAsO${}_{0.85}$ superconductor that disappear at T${}_{\mathrm{c}}$
• Structural properties and phase diagram of the $La(F{e}_{1-x}R{u}_x)AsO$ system
• Coexistence of ferromagnetic and stripe-type antiferromagnetic spin fluctuations in YFe${}_2$Ge${}_2$
• Positron potential and wavefunction in LaFeAsO
• Quantum critical behavior driven by Hund's rule coupling in quantum antiferromagnets
• Magnetic neutron scattering studies on the Fe-based superconductor system Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• A Finite-temperature First-principles Approach to Spin Fluctuation in BaFe_2As_2
• Emergent Nesting of the Fermi Surface from Local-Moment Description of Iron-Pnictide High-Tc Superconductors
• Spin Waves and Spatially Anisotropic Exchange Interactions in the $\mathrm{S}=2$ Stripe Antiferromagnet Rb${}_{0.8}$Fe${}_{1.5}$S${}_2$
• Role of Sn impurity on electronic topological transitions in 122 Fe-based superconductors
• Anomalous Dome-like Superconductivity in RE2(Cu1-xNix)5As3O2(RE=La, Pr, Nd)
• Anisotropic superconducting properties of aligned Sm${}_{0.95}$La${}_{0.05}$FeAsO${}_{0.85}$F${}_{0.15}$ microcrystalline powder
• Coexistence of localized and itinerant magnetism in intercalated iron-selenide (Li,Fe)OHFeSe
• Intrinsic charge dynamics in high-Tc AFeAs(O,F) superconductors
• The structural distortion in antiferromagnetic LaFeAsO investigated by a group-theoretical approach
• Spin-wave energy dispersion of a frustrated spin-1/2 Heisenberg antiferromagnet on a stacked square lattice
• Electron-phonon coupling in the superconducting single crystal Rb${}_{0.8}$Fe${}_{1.68}$Se${}_2$
• Static and Dynamical Susceptibility of LaO1-xFxFeAs
• Phase Diagram and Quantum Critical Point in Newly Discovered Superconductors: SmO_{1-x}F_xFeAs
• Competitions of magnetism and superconductivity in FeAs-based materials
• Contrast of LiFeAs with isostructural, isoelectronic, and non-superconducting MgFeGe
• Direct evidence for the magnetic ordering of Nd ions in NdFeAsO by high resolution inelastic neutron scattering
• Constraints Imposed by Symmetry on Pairing Operators for the Pnictides
• Avoided ferromagnetic quantum critical point: Antiferromagnetic ground state in substituted CeFePO
• Spin Quenching Assisted by a Strongly Anisotropic Compression Behavior in MnP
• Structural Phase Transition, Antiferromagnetism and Two Superconducting Domes in LaFeAsO${}_{1-x}$F${}_x$ (0 $<x\le$ 0.75)
• Specific Heat and Upper Critical Field of Sc5Ir4Si10 Superconductor
• Magnetic Properties Controlled by Interstitial or Interlayer Cations in Iron Chalcogenides
• Uniaxial "nematic-like" electronic structure and Fermi surface of untwinned CaFe2As2
• Effects of the vortices and impurities on the nuclear spin relaxation rate in iron-based superconductors
• Fermi surfaces of iron-pnictide high-Tc superconductors from the limit of local magnetic moments
• Evidence the ferromagnetic order on CoSb layer of LaCoSb${}_2$
• Collective Mode at Lifshitz Transition in Iron-Pnictide Superconductors
• Oriented gap opening in the magnetically ordered state of Iron-pnicitides: an impact of intrinsic unit cell doubling on the $Fe$ square lattice by $As$ atoms
• Superconductivity induced by U-doping in the SmFeAsO system
• Correlation effects in Ni 3d states of LaNiPO
• Spin density wave in oxypnictide superconductors in a three-band model
• Magnetic and pairing properties of a two-orbital model for the pnictide superconductors: A quantum Monte Carlo study
• Structural properties, defects and structural phase transition in the ROFeM (R=La, Nd; M=As, P) materials
• Impurity states in antiferromagnetic Iron Arsenides
• Unconventional superconductivity originating from disconnected Fermi surfaces in the iron-based compound
• Structural investigation of the Sm(Fe1-xRux)As(O0.85F0.15) system: a synchrotron X-ray powder diffraction study
• The magnetoresistance and Hall effect in CeFeAsO: a high magnetic field study
• The reason why doping causes superconductivity in LaFeAsO
• Influence of electronic correlations on orbital polarizations in the parent and doped iron pnictides
• Structural distortion as prerequisite for superconductivity in LiFeAs
• Aligned crystallite powder of NdFeAsO${}_{0.86}$F${}_{0.14}$: magnetic hysteresis and penetration depth
• Pressure Effects on the Superconducting and Spin-Density-Wave States of the Newly Discovered Sm(O1-xFx)FeAs
• Study of Ni and Zn doped CeOFeAs: Effect on the structural transition and specific heat capacity
• Breakdown of the Hund's Rule in CuFeAs
• Orbital-transverse density-wave instabilities in iron-based superconductors
• Evidence for negative thermal expansion in the superconducting precursor phase SmFeAsO
• Thermal activation energy of 3D vortex matter in NaFe1-xCoxAs (x=0.01, 0.03 and 0.07) single crystals
• Evidence of spin density wave in LaFeAsO, the parent material of the new Fe-based oxypnictide superconductors
• Universal quasi-degenerate orbital origin of two-dome phases in iron pnictide superconductors
• Interplay of iron and rare-earth magnetic order in rare-earth iron pnictide superconductors under magnetic field
• Indirect K-edge bimagnon resonant inelastic X-ray scattering spectrum of $\alpha$-FeTe
• Complete electronic phase diagram and enhanced superconductivity in fluorine-doped PrFeAsO1-xFx
• The mechanism of anisotropic exchange interaction in superconducting iron arsenides
• Superconductivity at 33 K in potassium-doped 1,2:8,9-dibenzopentacene
• Effects of the sintering atmosphere on the superconductivity of SmFeAsO1-xFx compounds
• Localized and itinerant dichotomy of electrons in Ba(Fe,Co)2As2
• A Short Review of the $S_4$ Symmetric Microscopic Model for Iron-Based High Temperature Superconductors
• First-principles study of the electronic structure of CaKRu${}_4$P${}_4$
• Atomic-scale imaging of electronic nematicity in ferropnictides
• The role of magnetic excitations in magnetoresistance and Hall effect of slightly TM-substituted BaFe${}_2$As${}_2$ compounds (TM = Mn, Cu, Ni)
• Magnetic properties of iron pnictides from spin-spiral calculations
• Isovalent substitution effects of arsenic on structural and electrical properties of iron-based superconductor NdFeAsO0.8F0.2
• Phase separation near half-filling point in superconducting compounds