Preferred Spin Excitations in the Bilayer Iron-Based Superconductor CaK(Fe${}_{0.96}$Ni${}_{0.04}$)${}_4$As${}_4$ with Spin-Vortex Crystal Order

Abstract

The spin-orbit coupling (SOC) is a key to understand the magnetically driven superconductivity in iron-based superconductors, where both local and itinerant electrons are present and the orbital angular momentum is not completely quenched. Here, we report a neutron scattering study on the bilayer compound CaK(Fe${}_{0.96}$Ni${}_{0.04}$)${}_4$As${}_4$ with superconductivity coexisting with a non-collinear spin-vortex crystal magnetic order that preserves the tetragonal symmetry of Fe-Fe plane. In the superconducting state, two spin resonance modes with odd and even $L$ symmetries due to the bilayer coupling are found similar to the undoped compound CaKFe${}_4$As${}_4$ but at lower energies. Polarization analysis reveals that the odd mode is $c-$axis polarized, and the low-energy spin anisotropy can persist to the paramagnetic phase at high temperature, which closely resembles other systems with in-plane collinear and $c-$axis biaxial magnetic orders. These results provide the missing piece of the puzzle on the SOC effect in iron-pnictide superconductors, and also establish a common picture of $c-$axis preferred magnetic excitations below $T_c$ regardless of the details of magnetic pattern or lattice symmetry.

arXiv comment14 pages, 11 figures, including Supplementary Materials. Accepted for publication on Physical Review Letters

References in corpus (56)

• Advanced capabilities for materials modelling with Quantum ESPRESSO
• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• The virtual crystal approximation revisited: Application to dielectric and piezoelectric properties of perovskites
• Strong electronic correlations from Hund's coupling
• Antiferromagnetic order and spin dynamics in iron-based superconductors
• Resonant Spin Excitation in the High Temperature Superconductor Ba0.6K0.4Fe2As2
• Magnetism and its microscopic origin in iron-based high-temperature superconductors
• High Temperature Superconductivity in Iron Pnictides and Chalcogenides
• FermiSurfer: Fermi-surface viewer providing multiple representation schemes
• The effect of collective spin-1 excitations on electronic spectra in high-Tc superconductors
• Iron based high transition temperature superconductors
• Nematic spin correlations in the tetragonal state of uniaxial strained BaFe2-xNixAs2
• Superconductivity-induced reentrance of orthorhombic distortion in Ba1-xKxFe2As2
• Manifestations of nematic degrees of freedom in the magnetic, elastic, and superconducting properties of the iron pnictides
• Anisotropic thermodynamic and transport properties of single crystalline CaKFe${}_4$As${}_4$
• Double-Q spin-density wave in iron arsenide superconductors
• Neutron Scattering Resonance and the Fe-pnictide Superconducting Gap
• Hedgehog spin-vortex crystal stabilized in a hole-doped iron-based superconductor
• Competing orders in FeAs layers
• Coexistence and competition of the short-range incommensurate antiferromagnetic order with superconductivity in BaFe2-xNixAs2
• Spin fluctuations in iron pnictides and chalcogenides: From antiferromagnetism to superconductivity
• Avoided quantum criticality and magnetoelastic coupling in BaFe${}_{2-x}$Ni${}_x$As${}_2$
• Optimization of the Crystal Growth of the Superconductor CaKFe${}_4$As${}_4$ from Solution in the FeAs-CaFe${}_2$As${}_2$-KFe${}_2$As${}_2$ System
• Close relationship between superconductivity and the bosonic mode in Ba0.6K0.4Fe2As2 and Na(Fe0.975Co0.025)As
• 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
• Vestigial chiral and charge orders from bidirectional spin-density waves: Application to the iron-based superconductors
• 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
• Magnetic fluctuations and superconducting properties of CaKFe4As4 studied by 75As NMR
• Neutron spin resonance in a quasi-two-dimensional iron-based superconductor
• Prominent role of spin-orbit coupling in FeSe
• Odd and even modes of neutron spin resonance in the bilayer iron-based superconductor CaKFe${}_4$As${}_4$
• Orbital selectivity in electron correlations and superconducting pairing of iron-based superconductors
• Electronic properties, low-energy Hamiltonian and superconducting instabilities in CaKFe${}_4$As${}_4$
• Antiferromagnetic order in CaK(Fe[1-x]Ni[x])4As4 and its interplay with superconductivity
• Neutron spin resonance in the 112-type iron-based superconductor
• Anisotropic neutron spin resonance in underdoped superconducting NaFe1-xCoxAs
• Magnetic anisotropy in hole-doped superconducting Ba 0.67K 0.33Fe 2As2 probed by polarized inelastic neutron scattering
• Polarized neutron scattering studies of magnetic excitations in electron-overdoped superconducting BaFe${}_{1.85}$Ni${}_{0.15}$As${}_2$
• Anisotropy of incommensurate magnetic excitations in slightly overdoped Ba${}_{0.5}$K${}_{0.5}$Fe${}_2$As${}_2$ probed by polarized inelastic neutron scattering experiments
• Crystal growth and phase diagram of 112-type iron pnictide superconductor Ca1-yLayFe1-xNixAs2
• Impact of local-moment fluctuations on the magnetic degeneracy of iron arsenide superconductors
• High Tc superconductivity in CaKFe${}_4$As${}_4$ in absence of nematic fluctuations
• Spin anisotropy due to spin-orbit coupling in optimally hole-doped Ba${}_{0.67}$K${}_{0.33}$Fe${}_2$As${}_2$
• Intertwined spin-orbital coupled orders in the iron-based superconductors
• In-plane uniaxial pressure-induced out-of-plane antiferromagnetic moment and critical fluctuations in BaFe${}_2$As${}_2$
• Suppression of low-energy longitudinal spin-excitations in Co-underdoped BaFe2As2
• Spin excitation anisotropy in optimal-isovalent-doped superconductor BaFe2(As0.7P0.3)2
• Doping evolution of antiferromagnetism and transport properties in the non-superconducting BaFe2-2xNixCrxAs2
• Strong Spin Resonance Mode associated with suppression of soft magnetic ordering in Hole-doped Ba1-xNaxFe2As2
• Preferred magnetic excitations in Sr${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$
• Doping effects of Cr on the physical properties of BaFe${}_{1.9-x}$Ni${}_{0.1}$Cr${}_x$As${}_2$
• Spin-Excitations Anisotropy in the Bilayer Iron-Based Superconductor CaKFe${}_4$As${}_4$
• Temperature and polarization dependence of low-energy magnetic fluctuations in nearly-optimal-doped NaFe${}_{0.9785}$Co${}_{0.0215}$As
• Orbital-dependent modulation of the superconducting gap in uniaxially strained Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$

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• Nematic fluctuations in the non-superconducting iron pnictide BaFe${}_{1.9-x}$Ni${}_{0.1}$Cr${}_x$As${}_2$
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• Interplay of stripe and double-Q magnetism with superconductivity in ${\mathrm{Ba}}_{1-x}{\mathrm{K}}_x{\mathrm{Fe}}_2{\mathrm{As}}_2$ under the influence of magnetic fields
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