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Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe$_4$As$_4$ | | K. Iida
; Y. Nagai
; S. Ishida
; M. Ishikado
; N. Murai
; A. D. Christianson
; H. Yoshida
; Y. Inamura
; H. Nakamura
; A. Nakao
; K. Munakata
; D. Kagerbauer
; M. Eisterer
; K. Kawashima
; Y. Yoshida
; H. Eisaki
; A. Iyo
; | | Date: |
8 Jul 2019 | | 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 $T_ ext{c}=36.5$~K, the INS spectra exhibit the neutron
spin resonances at $Q_ ext{res}=1.27(2)$~$ ext{AA}^{-1}$ and
$1.79(3)$~$ ext{AA}^{-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
$E_ ext{res}=17.7(3)$~meV corresponding to $5.7(1)k_ ext{B}T_ ext{c}$.
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 $T_ ext{N}=15$~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 $J_1/k_ ext{B}=-1.31$~K and $J_c/k_ ext{B}=0.08$~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. | | Source: | arXiv, 1907.3839 | | Services: | Forum | Review | PDF | Favorites | |
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