2019
DOI: 10.1103/physrevb.100.014506
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Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe4As4

Abstract: Magnetic excitations and magnetic structure of EuRbFe4As4 were investigated by inelastic neutron scattering (INS), neutron diffraction, and random phase approximation (RPA) calculations. Below the superconducting transition temperature Tc = 36.5 K, the INS spectra exhibit the neutron spin resonances at Qres = 1.27(2)Å −1 and 1.79(3)Å −1 . They correspond to the 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 neut… Show more

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Cited by 48 publications
(52 citation statements)
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“…The unusual helical state considered in this paper has been established in the superconducting iron arsenide RbEuFe 4 As 4 [20,21], which has the superconducting transition at 36.5 K and magnetic transition at 15K. The most likely reason for very small nearest-neighbor bilinear exchange interaction J z,1 in this material is an accidental compensation of the normal and superconducting RKKY contributions to this parameter [30].…”
Section: Summary and Discussionmentioning
confidence: 98%
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“…The unusual helical state considered in this paper has been established in the superconducting iron arsenide RbEuFe 4 As 4 [20,21], which has the superconducting transition at 36.5 K and magnetic transition at 15K. The most likely reason for very small nearest-neighbor bilinear exchange interaction J z,1 in this material is an accidental compensation of the normal and superconducting RKKY contributions to this parameter [30].…”
Section: Summary and Discussionmentioning
confidence: 98%
“…At the instability point, we have relations given by Eqs. ( 18) and (20). This allows us to exclude both h and α 0 and express c 4 at the instability point via r b leading to Eq.…”
Section: Summary and Discussionmentioning
confidence: 99%
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“…This factor, as well as the redistribution between Eu-and Rb-layers of a small amount (5-10%) of atoms lead to self-doping of the nominally stoichiometric compounds with p-type carriers (0.25 holes/Fe atom); as a result, a superconducting state emerges with a critical temperature T c ≈ 36 K. Magnetic ordering in the Eu sublattice occurs at a temperature T m ∼ 15 K, inside the domain of the superconducting state. Due to the missing mirror symmetry along the c axis, in EuRbFe 4 As 4 (in contrast to EuFe 2 As 2 ), the magnetic order emerging below the Curie temperature is a helicoidal antiferromagnet structure [14,24,25].…”
Section: Methodsmentioning
confidence: 99%
“…17 Neutron diffraction measurements on a Eu1144 single crystal have been performed to clarify how the two-dimensional in-plane ferromagnetic Eu layers stack along the c axis. 19 A magnetic propagation vector of k = (0, 0, 0.25) is revealed, suggesting the rotation angle of 90 • between the in-plane ferromagnetically aligned Eu 2+ spins on adjacent layers. Such a helical magnetic structure of undoped Eu1144 is in stark contrast to the collinear A-type AFM structure of undoped EuFe 2 As 2 , but resembles those of EuCo 2 As 2 and EuNi 2 As 2 , showing an incommensurate magnetic propagation vector of k = (0, 0, 0.79) and k = (0, 0, 0.92), respectively.…”
Section: Introductionmentioning
confidence: 95%