Neutron spin resonance in the 112-type iron-based superconductor

Abstract

We use inelastic neutron scattering to study the low-energy spin excitations of 112-type iron pnictide Ca${}_{0.82}$La${}_{0.18}$Fe${}_{0.96}$Ni${}_{0.04}$As${}_2$ with bulk superconductivity below $T_c=22$ K. A two-dimensional spin resonance mode is found around $E=$ 11 meV, where the resonance energy is almost temperature independent and linearly scales with $T_c$ along with other iron-based superconductors. Polarized neutron analysis reveals the resonance is nearly isotropic in spin space without any $L$ modulations. Due to the unique monoclinic structure with additional zigzag arsenic chains, the As $4p$ orbitals contribute to a three-dimensional hole pocket around $\Gamma$ point and an extra electron pocket at $X$ point. Our results suggest that the energy and momentum distribution of spin resonance does not directly response to the $k_z$ dependence of fermiology, and the spin resonance intrinsically is a spin-1 mode from singlet-triplet excitations of the Cooper pairs in the case of weak spin-orbital coupling.

arXiv comment9 pages, 8 figures, with supplementary materials

References in corpus (60)

• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• Antiferromagnetic order and spin dynamics in iron-based superconductors
• Resonant Spin Excitation in the High Temperature Superconductor Ba0.6K0.4Fe2As2
• Pairing Symmetry and Pairing State in Ferropnictides: Theoretical Overview
• Normal-State Spin Dynamics and Temperature-Dependent Spin Resonance Energy in an Optimally Doped Iron Arsenide Superconductor
• The effect of collective spin-1 excitations on electronic spectra in high-Tc superconductors
• Theory of magnetic excitations in iron-based layered superconductors
• Strong Interplay between Stripe Spin Fluctuations, Nematicity and Superconductivity in FeSe
• Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2
• Spin Gap and Resonance at the Nesting Wavevector in Superconducting FeSe0.4Te0.6
• Neutron scattering as a probe of the Fe-pnicitide superconducting gap
• Three-dimensional Resonance in superconducting BaFe${}_{1.9}$Ni${}_{0.1}$As${}_2$
• Universal relation between magnetic resonance and superconducting gap in unconventional superconductors
• Superconductivity in Ca1-xLaxFeAs2: A Novel 112-Type Iron Pnictide with Arsenic Zigzag Bonds
• Neutron Scattering Resonance and the Fe-pnictide Superconducting Gap
• Resonance in the electron-doped high-Tc superconductor Pr0.88LaCe0.12CuO(4-delta)
• Discovery of New Layered Iron Arsenide Superconductor (Ca,Pr)FeAs2
• Magnetic Resonant Mode in the Low-Energy Spin-Excitation Spectrum of Superconducting Rb2Fe4Se5 Single Crystals
• Spin fluctuations in iron pnictides and chalcogenides: From antiferromagnetism to superconductivity
• Electron-doping evolution of the low-energy spin excitations in the iron arsenide BaFe${}_{2-x}$Ni${}_x$As${}_2$ superconductors
• Incommensurate magnetic excitations in superconducting LiFeAs
• Unusual Relationship between Magnetism and Superconductivity in FeTe${}_{0.5}$Se${}_{0.5}$
• Spin excitation anisotropy as a probe of orbital ordering in the paramagnetic tetragonal phase of superconducting BaFe1.904Ni0.096As2
• Splitting of resonance excitations in nearly optimally doped Ba(Fe0.94Co0.06)2As2: an inelastic neutron scattering study with polarization analysis
• Anisotropic Neutron Spin Resonance in Superconducting BaFe${}_{1.9}$Ni${}_{0.1}$As${}_2$
• Local magnetic anisotropy in BaFe${}_2$As${}_2$: a polarized inelastic neutron scattering study
• Degradation of superconductivity and spin fluctuations by electron over-doping in LaFeAsO${}_{1-x}$F${}_x$
• Distinguishing $s^{\pm }$ and $s^{++}$ electron pairing symmetries by neutron spin resonance in superconducting NaFe${}_{0.935}$Co${}_{0.045}$As
• Electron doping evolution of the magnetic excitations in BaFe2-xNixAs2
• Unified phase diagram for iron-based superconductors
• Doping-Enhanced Antiferromagnetism in Ca1-xLaxFeAs2
• Prominent role of spin-orbit coupling in FeSe
• Structural and magnetic phase transitions in Ca${}_{0.73}$La${}_{0.27}$FeAs${}_2$ with electron overdoped FeAs layers
• In-plane spin excitation anisotropy in the paramagnetic phase of NaFeAs
• Significant contribution of As 4p orbitals to the low-lying electronic structure of 112-type iron-based superconductor Ca0.9La0.1FeAs2
• Spin anisotropy of the resonance in superconducting FeSe0.5Te0.5
• Spin Resonance in the New-Structure-Type Iron-Based Superconductor CaKFe4As4
• Anisotropic neutron spin resonance in underdoped superconducting NaFe1-xCoxAs
• Universality of dispersive spin-resonance mode in superconducting BaFe2As2
• Polarized neutron scattering studies of magnetic excitations in electron-overdoped superconducting BaFe${}_{1.85}$Ni${}_{0.15}$As${}_2$
• Anisotropic Ginzburg-Landau scaling of Hc2 and transport properties of 112-type Ca0.8La0.2Fe0.98Co0.02As2 single crystal
• Low-energy spin excitations in Li(0.8)Fe(0.2)ODFeSe superconductor studied with inelastic neutron scattering
• Crystal growth and phase diagram of 112-type iron pnictide superconductor Ca1-yLayFe1-xNixAs2
• Coexistence of superconductivity and antiferromagnetism in Ca${}_{0.74(1)}$La${}_{0.26(1)}$(Fe${}_{1-x}$Co${}_x$)As${}_2$ single crystals
• Transition from sign-reversed to sign-preserved Cooper-pairing symmetry in sulfur-doped iron selenide superconductors
• Observation of the anisotropic Dirac cone in the band dispersion of 112-structured iron-based superconductor Ca0.9La0.1FeAs2
• Spin anisotropy due to spin-orbit coupling in optimally hole-doped Ba${}_{0.67}$K${}_{0.33}$Fe${}_2$As${}_2$
• Superconducting properties and pseudogap from preformed Cooper pairs in the triclinic (CaFe${}_{1-x}$Pt${}_x$As)${}_{10}$Pt${}_3$As${}_8$
• In-plane magnetic field effect on the neutron spin resonance in optimally doped FeSe${}_{0.4}$Te${}_{0.6}$ and BaFe${}_{1.9}$Ni${}_{0.1}$As${}_2$ superconductors
• Suppression of spin-exciton state in hole overdoped iron-based superconductors
• Spin excitation anisotropy in optimal-isovalent-doped superconductor BaFe2(As0.7P0.3)2
• Phase stability and large in-plane resistivity in the 112-type iron-based superconductor Ca${}_{1-x}$La${}_x$FeAs${}_2$
• Experimental elucidation of the origin of the `double spin resonances' in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Quasi-2D behavior of 112-type iron-based superconductors
• Temperature dependence of the resonance and low energy spin excitations in superconducting FeTe${}_{0.6}$Se${}_{0.4}$
• Site-Selective Antimony Doping in Arsenic Zigzag Chains of 112-type Ca1-xLaxFeAs2
• Orbital selective neutron spin resonance in underdoped superconducting NaFe${}_{\text{0.985}}$Co${}_{\text{0.015}}$As
• Temperature and polarization dependence of low-energy magnetic fluctuations in nearly-optimal-doped NaFe${}_{0.9785}$Co${}_{0.0215}$As

Cited by in corpus (16)

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• Odd and even modes of neutron spin resonance in the bilayer iron-based superconductor CaKFe${}_4$As${}_4$
• Unconventional density waves and superconductivities in Fe-based superconductors and other strongly correlated electron systems
• Ultrafast Optical Spectroscopy Evidence of Pseudogap and Electron-Phonon Coupling in an Iron-Based Superconductor KCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Charge Density Wave order and electron-phonon coupling in ternary superconductor Bi${}_2$Rh${}_3$Se${}_2$
• Preferred Spin Excitations in the Bilayer Iron-Based Superconductor CaK(Fe${}_{0.96}$Ni${}_{0.04}$)${}_4$As${}_4$ with Spin-Vortex Crystal Order
• Observation of a neutron spin resonance in the bilayered superconductor CsCa2Fe4As4F2
• Gapless spin-excitations in the superconducting state of a quasi-one-dimensional spin-triplet superconductor
• Spin-Excitations Anisotropy in the Bilayer Iron-Based Superconductor CaKFe${}_4$As${}_4$
• Neutron Spin Resonance Near a Lifshitz Transition in Overdoped Ba${}_{0.4}$K${}_{0.6}$Fe${}_2$As${}_2$
• Nematic fluctuations in the non-superconducting iron pnictide BaFe${}_{1.9-x}$Ni${}_{0.1}$Cr${}_x$As${}_2$
• Low-energy spin excitations in optimally doped CaFe${}_{0.88}$Co${}_{0.12}$AsF superconductor studied with inelastic neutron scattering
• Preformed Cooper Pairs in a Triclinic Iron Pnictide Superconductor
• Spin fluctuations in the 112-type iron-based superconductor Ca${}_{0.82}$La${}_{0.18}$Fe${}_{0.96}$Ni${}_{0.04}$As${}_2$
• Crystal growth and characterization of a hole-doped iron-based superconductor Ba(Fe${}_{0.875}$Ti${}_{0.125}$)${}_2$As${}_2$
• Three-dimensional spin susceptibility in Ba${}_{0.75}$K${}_{0.25}$Fe${}_2$As${}_2$: Out-of-plane modulation revealed by neutron spectroscopy and theoretical modeling