Neutron scattering study of the oxypnictide superconductor La(O,F)FeAs

Abstract

The newly discovered superconductor La(O,F)FeAs (Tc = 26 K) was investigated using the neutron scattering technique. No spin-density-wave (SDW) order was observed in the normal state nor in the superconducting state, both with and without an applied magnetic field of 9 T, consistent with the proposal that SDW and superconductivity are competing in the laminar materials. While our inelastic measurements offer no constraints on the spin dynamic response from d-wave pairing, an upper limit for the magnetic resonance peak predicted from an extended s-wave pairing mechanism is provided. Our measurements also support the energy scale of the calculated phonon spectrum which is used in electron-phonon coupling theory, and fails to produce the high observed Tc.

4 pages, 4 figures

References in corpus (17)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• LaFeAsO${}_{1-x}$F${}_x$: A low carrier density superconductor near itinerant magnetism
• Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO${}_{1-x}$F${}_x$FeAs
• Competing Orders and Spin-Density-Wave Instability in La(O${}_{1-x}$F${}_x$)FeAs
• Superconductivity in iron-based F-doped layered quaternary compound Nd[O1-xFx]FeAs
• Is LaO${}_{1-x}$F${}_x$FeAs an electron-phonon superconductor ?
• Superconductivity at 25 K in hole doped $(L{a}_{1-x}S{r}_x)OFeAs$
• Origin of the ~150 K Anomaly in LaOFeAs; Competing Antiferromagnetic Superexchange Interactions, Frustration, and Structural Phase Transition
• Correlated electronic structure of LaOFeAs
• Spin resonance in the d-wave superconductor CeCoIn5
• Hall effect and magnetoresistance in the normal state of the superconductor LaO${}_{0.9}$F${}_{0.1-x}$FeAs
• Upper critical field, Hall effect and magnetoresistance in the iron-based layered superconductor LaFeAsO_{0.9}F_{0.1-δ}
• Superconducting properties of Fe-based layered superconductor LaO${}_{0.9}$F${}_{0.1-\delta }$FeAs
• Superconductivity at 36 K in Gadolinium-arsenide Oxides GdO${}_{1-x}$F${}_x$FeAs
• A Generic Two-band Model for Unconventional Superconductivity and Spin-Density-Wave Order in Electron and Hole Doped Iron-Based Superconductors
• Pressure Effect on the superconducting properties of LaO_{1-x}F_{x}FeAs(x=0.11) superconductor

Cited by in corpus (26)

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• Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering
• Electronic structure of the iron-based superconductor LaOFeP
• High - Temperature Superconductivity in Iron Based Layered Compounds
• Itinerant magnetic excitations in antiferromagnetic CaFe2As2
• Structure and Magnetic Order in the NdFeAs(O,F) Superconductor System
• Intrinsic Properties of Stoichiometric LaOFeP
• Neutron Scattering Studies on the High-$T_c$ Superconductor La${}_3$Ni${}_2$O${}_{7-\delta }$ at Ambient Pressure
• ARPES studies of the electronic structure of LaOFe(P,As)
• Phonon Density of States of LaFeAsO1-xFx
• Superconducting Properties of the $s^{\pm }$-wave state: Fe-based superconductors
• Impurity Effects in Sign Reversing Fully-Gapped Superconductors: Analysis of FeAs Superconductors
• Coexistence of two order parameters and a pseudogaplike feature in the iron-based superconductor LaFeAsO_(1-x)F_x
• Neutron scattering Measurements of the phonon density of states of FeSe${}_{1-x}$ superconductors
• Lattice Dynamics of LaFeAsO_{1-x}F_{x} and PrFeAsO_{1-y} via Inelastic X-Ray Scattering and First-Principles Calculation
• Disappearance of static magnetic order and evolution of spin fluctuations in Fe${}_{1+\delta }$Se${}_x$Te${}_{1-x}$
• Impurity-induced in-gap state and Tc in sign-reversing s-wave superconductors: analysis of iron oxypnictide superconductors
• Phonon Density of States in Nd(O${}_{1-x}$F${}_x$)FeAs
• Neutron scattering investigation of the magnetic order in single crystalline BaFe2As2
• Effective Hamiltonian for FeAs based superconductors
• Anisotropic superconducting properties of aligned Sm${}_{0.95}$La${}_{0.05}$FeAsO${}_{0.85}$F${}_{0.15}$ microcrystalline powder
• Dynamical spin susceptibility of spin-valley half-metal
• Proposal to determine the Fermi-surface topology of a doped iron-based superconductor using bulk-sensitive Fourier-transform Compton scattering
• High resolution Compton scattering as a Probe of the Fermi surface in the Iron-based superconductor $La{O}_{1-x}{F}_{x}FeAs$
• Cu, Pu and Fe high Tc superconductors: all the same mechanism!