Theory of Magnetic Fluctuations in Iron Pnictides

Abstract

Magnetic fluctuations in an unconventional superconductor (U-SC) can distinguish between distinct proposals for the symmetry of the order parameter. Motivated thereby, we undertake a study magnetic fluctuations in Iron pnictides, tracking their evolution from the incoherent normal, pseudogapped metal, to the U-SC state. Within our proposal of extended-s-plus s_{xy} inplane gap with proximity-induced out-of-plane line nodes, (i) we describe the evolution of the spin-lattice relaxation rate, from a non-Korringa form in the normal state, to a power-law form in the U-SC in good agreement with experiment, and (ii) we predict a sharp resonance in the U-SC state along (π,π), but not along (π/2,0), along with modulated c-axis intensity in inelastic neutron scattering work as a specific and testable manifestation of our proposal.

4 pages, 3 figures - to be submitted to PRL

References in corpus (36)

• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• Strong Correlations and Magnetic Frustration in the High Tc Iron Pnictides
• Pnictogen height as a possible switch between high-T_c nodeless and low-T_c nodal pairings in the iron based superconductors
• Resonant Spin Excitation in the High Temperature Superconductor Ba0.6K0.4Fe2As2
• Origin of the ~150 K Anomaly in LaOFeAs; Competing Antiferromagnetic Superexchange Interactions, Frustration, and Structural Phase Transition
• Correlated electronic structure of LaOFeAs
• Ising and Spin orders in Iron-based Superconductors
• Why Does Undoped FeSe Become A High Tc Superconductor Under Pressure?
• Pairing Symmetry and Pairing State in Ferropnictides: Theoretical Overview
• The BCS-like gap in superconductor SmFeAsO_0.85F_0.15
• Electronic structure of the iron-based superconductor LaOFeP
• Theory of magnetic excitations in iron-based layered superconductors
• 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
• Evidence for nodal superconductivity in LaFePO
• Neutron scattering as a probe of the Fe-pnicitide superconducting gap
• Three-dimensional Resonance in superconducting BaFe${}_{1.9}$Ni${}_{0.1}$As${}_2$
• NMR relaxation rate in superconducting pnictides: extended $s_{\pm }$ scenario
• Itinerant magnetic excitations in antiferromagnetic CaFe2As2
• Momentum-dependence of Superconducting Gap, strong-coupling dispersion Kink, and tightly bound Cooper pairs in the high-Tc (Sr,Ba)1-x(K,Na)xFe2As2 superconductors
• Tightly-bound Cooper pair, quasiparticle kinks and clues on the pairing potential in a high Tc FeAs Superconductor
• Theory of the Magnetic Moment in Iron Pnictides
• Lifting of nodes by disorder in extended-$s$ state superconductors: application to ferropnictides
• 19-F NMR Investigation of Iron-pnictide Superconductor LaFeAsO(0.89)F(0.11)
• Neutron Scattering Resonance and the Fe-pnictide Superconducting Gap
• Universal linear-temperature dependence of static magnetic susceptibility in iron-pnictides
• Magnetic penetration depth of single crystal SmFeAsO_{1-x}F_y: a fully gapped superconducting state
• Normal State Correlated Electronic Structure of Iron Pnictides
• Two superconducting gaps in LaFeAsO0.92F0.08 revealed by 75As nuclear quadrupole resonance
• Signatures of Electronic Correlations in Optical Properties of LaFeAsO${}_{1-x}$F${}_x$
• Correlation effects in the iron pnictides
• Anisotropic London Penetration Depth and Superfluid Density in Single Crystals of Iron-based Pnictide Superconductors
• Theory of Multiband Superconductivity in Iron Pnictides
• Magnetic Properties of the Superconducting State of Iron-Based Superconductors
• Systematic ^{75}As NMR study of the dependence of low-lying excitations on F doping in the iron oxypnictide LaFeAs(O_{1-x}F_{x})
• Dynamic spin-response function of the high-temperature Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ superconductor form angle resolved photoemission spectra

Cited by in corpus (3)

• Evidence for superconducting gap nodes in the zone-centered hole bands of KFe2As2 from magnetic penetration-depth measurements
• Dichotomy between large local and small ordered magnetic moment in Iron-based superconductors
• Doping dependence of spin fluctuations and electron correlations in iron pnictides