Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe${}_4$As${}_4$

Abstract

Magnetic excitations and magnetic structure of EuRbFe${}_4$As${}_4$ were investigated by inelastic neutron scattering (INS), neutron diffraction, and random phase approximation (RPA) calculations. Below the superconducting transition temperature $T_{\text{c}}=36.5$~K, the INS spectra exhibit the neutron spin resonances at $Q_{\text{res}}=1.27(2)$~${\text{A˚}}^{-1}$ and $1.79(3)$~${\text{A˚}}^{-1}$. They correspond to the $\mathbf{Q}=(0.5,0.5,1)$ and $(0.5,0.5,3)$ nesting wave vectors, showing three dimensional nature of the band structure. The characteristic energy of the neutron spin resonance is $E_{\text{res}}=17.7(3)$~meV corresponding to $5.7(1)k_{\text{B}}{T}_{\text{c}}$. Observation of the neutron spin resonance mode and our RPA calculations in conjunction with the recent optical conductivity measurements are indicative of the $s_{\pm }$ superconducting pairing symmetry in EuRbFe${}_4$As${}_4$. In addition to the neutron spin resonance mode, upon decreasing temperature below the magnetic transition temperature $T_{\text{N}}=15$~K, the spin wave excitation originating in the long-range magnetic order of the Eu sublattice was observed in the low-energy inelastic channel. Single-crystal neutron diffraction measurements demonstrate that the magnetic propagation vector of the Eu sublattice is $\mathbf{k}=(0,0,0.25)$, representing the three-dimensional antiferromagnetic order. Linear spin wave calculations assuming the obtained magnetic structure with the intra- and inter-plane nearest neighbor exchange couplings of $J_1/k_{\text{B}}=-1.31$~K and $J_c/k_{\text{B}}=0.08$~K can reproduce quantitatively the observed spin wave excitation. Our results show that superconductivity and long-range magnetic order of Eu coexist in EuRbFe${}_4$As${}_4$ whereas the coupling between them is rather weak.

arXiv comment8 pages, 4 figures

References in corpus (61)

• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Antiferromagnetic order and spin dynamics in iron-based superconductors
• Resonant Spin Excitation in the High Temperature Superconductor Ba0.6K0.4Fe2As2
• Linear spin wave theory for single-Q incommensurate magnetic structures
• Normal-State Spin Dynamics and Temperature-Dependent Spin Resonance Energy in an Optimally Doped Iron Arsenide Superconductor
• Neutron Scattering from Magnetic Excitations in Bi_2 Sr_2 Ca_2 O_8+delta
• Theory of magnetic excitations in iron-based layered superconductors
• Comparison of Ab initio Low-Energy Models for LaFePO, LaFeAsO, BaFe2As2, LiFeAs, FeSe and FeTe: Electron Correlation and Covalency
• Magnetism in Fe-based superconductors
• Spin resonance in the d-wave superconductor CeCoIn5
• Superconductivity induced by phosphorus doping and its coexistence with ferromagnetism in EuFe${}_2$(As${}_{0.7}$P${}_{0.3}$)${}_2$
• The Spin Excitation Spectrum in Superconducting $\mathbf{YB}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_{6.85}$
• Spin Gap and Resonance at the Nesting Wavevector in Superconducting FeSe0.4Te0.6
• Magnetic Resonant Mode in the Single-Layer High Temperature Superconductor Tl${}_2$Ba${}_2$Cu${}_{6+\delta }$
• High-Temperature Superconductivity in Eu0.5K0.5Fe2As2
• Antiferromagnetic transition in EuFe${}_2$As${}_2$: A possible parent compound for superconductors
• Neutron scattering as a probe of the Fe-pnicitide superconducting gap
• Magnetic structure of EuFe2As2 determined by single crystal neutron diffraction
• Electrical Resistivity and Specific Heat of EuFe2As2 Single Crystals: Magnetic homologue of SrFe2As2
• Static and Dynamic Magnetism in Underdoped Superconductor BaFe${}_{1.92}$Co${}_{0.08}$As${}_2$
• Symmetry of spin excitation spectra in the tetragonal paramagnetic and superconducting phases of 122-ferropnictides
• Metamagnetic transition in EuFe${}_2$As${}_2$ single crystals
• Interplay of antiferromagnetism, ferromagnetism and superconductivity in EuFe_2(As_1-xP_x)_2 single crystals
• Spin fluctuations in LiFeAs observed by neutron scattering
• Superconductivity and Ferromagnetism in Hole-Doped RbEuFe${}_4$As${}_4$
• Superconductivity and local-moment magnetism in Eu(Fe${}_{0.89}$Co${}_{0.11}$)${}_2$As${}_2$
• Effects of the magnetic orderings on the dynamical conductivity: optical investigations of EuFe${}_2$As${}_2$ single crystals
• Spin fluctuations in iron pnictides and chalcogenides: From antiferromagnetism to superconductivity
• Incommensurate itinerant antiferromagnetic excitations and spin resonance in the FeTe${}_{0.6}$Se${}_{0.4}$ superconductor
• Superconductivity at 34.7 K in the iron arsenide Eu0.7Na0.3Fe2As2
• Absolute cross-section normalization of magnetic neutron scattering data
• Effect of Fermi Surface Nesting on Resonant Spin Excitations in Ba1-xKxFe2As2
• EuFe2(As1-xPx)2: reentrant spin glass and superconductivity
• Haydeeite: a spin-1/2 kagome ferromagnet
• Suppression of spin-density-wave transition and emergence of ferromagnetic ordering of Eu${}^{2+}$ moments in EuFe${}_{2-x}$Ni${}_x$As${}_2$
• Superconductivity and ferromagnetism in EuFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Anisotropic superconductivity and magnetism in single-crystal RbEuFe${}_4$As${}_4$
• Inelastic neutron scattering study on the resonance mode in an optimally doped superconductor LaFeAsO${}_{0.92}$F${}_{0.08}$
• Odd and even modes of neutron spin resonance in the bilayer iron-based superconductor CaKFe${}_4$As${}_4$
• Magnetic excitations of Fe_{1+y}Se_xTe_{1-x} in magnetic and superconductive phases
• Magnetic structure of the Eu2+ moments in superconducting EuFe2(As1-xPx)2 with x = 0.19
• Reentrant Superconductivity in Eu(Fe1-xIrx)2As2
• Superconducting and magnetic phase diagram of RbEuFe4As4 and CsEuFe4As4 at high pressure
• Magnetic ground state of superconducting Eu(Fe0.88Ir0.12)2As2: A combined neutron diffraction and first-principles calculation study
• RbEu(Fe${}_{1-x}$Ni${}_x$)${}_4$As${}_4$: From a ferromagnetic superconductor to a superconducting ferromagnet
• Unique interplay between superconducting and ferromagnetic orders in EuRbFe${}_4$As${}_4$
• Phase diagram of Eu magnetic ordering in Sn-flux-grown Eu(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ single crystals
• Spin Resonance in the New-Structure-Type Iron-Based Superconductor CaKFe4As4
• Switching of intra-orbital spin excitations in electron-doped iron pnictide superconductors
• Spin resonance in the superconducting state of Li${}_{1-x}$Fe${}_x$ODFe${}_{1-y}$Se observed by neutron spectroscopy
• Strongly fluctuating moments in the high-temperature magnetic superconductor RbEuFe${}_4$As${}_4$
• Strong coupling between Eu2+ spins and Fe2As2 layers in EuFe1.9Co0.1As2 observed with NMR
• Electronic structure of Ni-doped EuRbFe${}_4$As${}_4$: Unique crystal field splitting and multiband RKKY interactions
• $\mu$SR and Neutron Diffraction Investigations on Reentrant Ferromagnetic Superconductor Eu(Fe{0.86}Ir{0.14})2As2
• Magnetism and superconductivity in Eu(Fe${}_{1-x}$Ni${}_x$)As${}_2$ ($x$ = 0, 0.04)
• Magnetic phase diagram in Eu${}_{1-x}$La${}_x$Fe${}_2$As${}_2$ single crystals
• Pressure-temperature phase diagram of EuRbFe${}_4$As${}_4$ superconductor
• Reentrant phases in electron-doped ${\text{EuFe}}_2{\text{As}}_2$: spin glass and superconductivity
• Q-scan-analysis of the neutron scattering in iron-based superconductors
• Effects of pressure and magnetic field on the re-entrant superconductor Eu(Fe${}_{0.93}$Rh${}_{0.07}$)${}_2$As${}_2$

Cited by in corpus (23)

• Smectic Pair Density Wave Order in EuRbFe4As4
• Topological superconductivity and Majorana states in low-dimensional systems
• Aspects of topological superconductivity in 2D systems: noncollinear magnetism, skyrmions, and higher-order topology
• When superconductivity does not fear magnetism: Insight into electronic structure of RbEuFe${}_4$As${}_4$
• Vortex dynamic, pinning and irreversibility field investigation in EuRbFe4As4 superconductor
• Superconductivity driven helical magnetic structure in EuRbFe${}_4$As${}_4$ ferromagnetic superconductor
• Observing the suppression of superconductivity in RbEuFe${}_4$As${}_4$ by correlated magnetic fluctuations
• Helical structures in layered magnetic superconductors due to indirect exchange interactions mediated by interlayer tunneling
• Superconductivity-driven ferromagnetism and spin manipulation using vortices in the magnetic superconductor EuRbFe4As4
• Topological magnetic order and superconductivity in EuRbFe${}_4$As${}_4$
• Superconductivity and phase diagrams of CaK(Fe${}_{1-x}$Mn${}_x$)${}_4$As${}_4$ single crystals
• Novel magnetic stoichiometric superconductor EuRbFe4As4
• Suppression of superconducting parameters by correlated quasi-two-dimensional magnetic fluctuations
• Anisotropic magnetotransport properties coupled with spiral spin modulation in a triangular-lattice magnet EuZnGe
• Antiferromagnetic resonances in twinned EuFe2As2 single crystal
• Magnetic and superconducting anisotropy in Ni-doped RbEuFe${}_4$As${}_4$ single crystals
• Magnetic and superconducting phase diagram of Eu(Fe${}_{1-x}$Ni${}_x$)As${}_2$
• Evolution from helical to collinear ferromagnetic order of the Eu${}^{2+}$ spins in RbEu(Fe${}_{1-x}$Ni${}_x$)${}_4$As${}_4$
• Odd-Parity Magnetism in Fe-Based Superconductors
• Phenomenological theory of magnetic 90${}^{\circ }$ helical state
• In-situ local imaging of ferromagnetism and superconductivity in RbEuFe${}_4$As${}_4$
• Spin waves and high-frequency response in layered superconductors with helical magnetic structure
• Competing ferromagnetic superconducting states in europium-based iron pnictides