Neutron-Inelastic-Scattering Peak by Dissipationless Mechanism in the s++ -wave State in Iron-based Superconductors

Abstract

We investigate the neutron scattering spectrum in iron pnictides based on the random-phase approximation in the five-orbital model with a realistic superconducting (SC) gap, Delta=5meV. In the normal state, the neutron spectrum is suppressed by large inelastic quasi-particle (QP) scattering rate gamma* ~ Delta. In the fully-gapped s-wave state without sign reversal (s++), a hump-shaped enhancement appears in the neutron spectrum just above 2Delta, since the inelastic QP scattering is prohibited by the SC gap. That is, the hump structure is produced by the dissipationless QPs for Ek<3Delta. The obtained result is more consistent with experimental spectra, compared to the results of our previous paper with Delta=50meV. On the other hand, both height and weight of the resonance peak in the fully-gapped s-wave states with sign reversal (s+-) are much larger than those observed in experiments. We conclude that experimentally observed broad spectral peak in iron pnictides is created by the present "dissipationless mechanism" in the s++ -wave state.

9 pages, 6 figures, note added in conclusion following an editor's suggestion

References in corpus (24)

• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• Effect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO1-y (Ln=La,Nd)
• Theory of magnetic excitations in iron-based layered superconductors
• Spin resonance in the d-wave superconductor CeCoIn5
• Superconductivity in SrFe_(2-x)Co_xAs_2: Internal Doping of the Iron Arsenide Layers
• Microwave Penetration Depth and Quasiparticle Conductivity in PrFeAsO_1-y Single Crystals : Evidence for a Full-Gap Superconductor
• Electron Correlations in the Low Carrier Density LaFeAsO0.89F0.11 Superconductor (Tc = 28 K)
• Spin Gap and Resonance at the Nesting Wavevector in Superconducting FeSe0.4Te0.6
• Superconducting gap symmetry of Ba0.6K0.4Fe2As2 studied by angle-resolved photoemission spectroscopy
• Neutron scattering as a probe of the Fe-pnicitide superconducting gap
• Origin of Orthorhombic Transition, Magnetic Transition, and Shear Modulus Softening in Iron Pnictide Superconductors: Analysis based on the Orbital Fluctuation Theory
• Origin of Gap Anisotropy in Spin Fluctuation Models of the Fe-pnictides
• Momentum-resolved superconducting gap in the bulk of Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ from combined ARPES and $\mu$SR measurements
• Neutron Scattering Resonance and the Fe-pnictide Superconducting Gap
• Orbital Fluctuation Theory in Iron Pnictides: Effects of As-Fe-As Bond Angle, Isotope Substitution, and $Z^2$-Orbital Pocket on the Superconductivity
• On the Superconductivity of LaFe1-yCoyAsO1-xFx
• Local measurement of the superfluid density in the pnictide superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ across the superconducting dome
• Optical properties of the iron-arsenic superconductor BaFe1.85Co0.15As2
• Emergence of Fully-Gapped $s_{++}$-wave and Nodal d-wave States Mediated by Orbital- and Spin-Fluctuations in Ten-Orbital Model for KFe${}_2$Se${}_2$
• Superconductivity induced by ruthenium substitution in an iron arsenide: investigation of SrFe2-xRuxAs2 (0 <= x <= 2)
• Study of Ni-doping Effect of Specific Heat and Transport Properties for LaFe1-yNiyAsO0.89F0.11
• Determination of the pairing state in iron-based superconductors through neutron scattering

Cited by in corpus (36)

• Unconventional Superconductivity
• Self-Consistent Vertex Correction Analysis for Iron-Based Superconductors: Mechanism of Coulomb-Interaction-Driven Orbital Fluctuations
• Spin fluctuations in iron pnictides and chalcogenides: From antiferromagnetism to superconductivity
• Fully gapped superconductivity with no sign change in the prototypical heavy-fermion CeCu2Si2
• Superconductivity, Antiferromagnetism, and Neutron Scattering
• Superconducting Properties of the $s^{\pm }$-wave state: Fe-based superconductors
• Linear Response Theory for Shear Modulus $C_{66}$ and Raman Quadrupole Susceptibility: Significant Evidence for Orbital Nematic Fluctuations in Fe-Based Superconductors
• Potential antiferromagnetic fluctuations in hole-doped iron-pnictide superconductor Ba_{1-x}K_{x}Fe_{2}As_{2} studied by ^{75}As nuclear magnetic
• Distinguishing $s^{\pm }$ and $s^{++}$ electron pairing symmetries by neutron spin resonance in superconducting NaFe${}_{0.935}$Co${}_{0.045}$As
• Superconducting state in Fe-based materials and spin-fluctuation theory of pairing
• Nodal gap structure in Fe-based superconductors due to the competition between orbital and spin fluctuations
• Impurity-Induced Electronic Nematic State in Iron-Pnictide Superconductors
• Unconventional density waves and superconductivities in Fe-based superconductors and other strongly correlated electron systems
• Incommensurate magnetic fluctuations and Fermi surface topology in LiFeAs
• Revisit of the Orbital-Fluctuation-Mediated Superconductivity in LiFeAs: Nontrivial Spin-Orbit Interaction Effects on the Bandstructure and Superconducting Gap Function
• Universality of dispersive spin-resonance mode in superconducting BaFe2As2
• Effect of realistic finite-size impurities on Tc in Fe-based superconductors based on the five-orbital tight-binding model
• Non-Fermi-Liquid Transport Phenomena and Superconductivity Driven by Orbital Fluctuations in Iron Pnictides: Analysis by Fluctuation-Exchange Approximation
• Effect of gap anisotropy on the spin resonance peak in the superconducting state of iron-based materials
• Spin resonance peak in Fe-based superconductors with unequal gaps
• Interplay between unconventional superconductivity and heavy-fermion quantum criticality: CeCu${}_2$Si${}_2$ versus YbRh${}_2$Si${}_2$
• Double magnetic resonance and spin anisotropy in Fe-based superconductors due to static and fluctuating antiferromagnetic orders
• Suppression of spin-exciton state in hole overdoped iron-based superconductors
• Temperature dependence of the resonance and low energy spin excitations in superconducting FeTe${}_{0.6}$Se${}_{0.4}$
• Possible spin excitation structure in monolayer FeSe grown on SrTiO${}_3$
• Self-energy driven resonance-like inelastic neutron spectrum in $s_{++}$-wave state in Fe-based superconductors
• Possible pairing symmetry in the FeSe-based superconductors determined by quasiparticle interference
• Quasiparticle Interference in Fe-based Superconductors Based on a Five-Orbital Tight-Binding Model
• Theory of Mixed-State Effect on Quasiparticle Interference in Iron-based Superconductors
• Q-scan-analysis of the neutron scattering in iron-based superconductors
• Evidence of a multiple boson emission in Sm${}_{1-x}$Th${}_x$OFeAs
• Effect of inelastic scattering on the nuclear magnetic relaxation rate 1/T1T in iron-based superconductors
• Strong electron-boson coupling in the iron-based superconductor BaFe1.9Pt0.1As2 revealed by infrared spectroscopy
• Effect of pairing fluctuations on the spin resonance in Fe-based superconductors
• Hot-lines topology and the fate of the spin resonance mode in three-dimensional unconventional superconductors
• Q Dependence of Magnetic Resonance Mode on FeTe${}_{0.5}$Se${}_{0.5}$ Studied by Inelastic Neutron Scattering