Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe4As4

被引:38
作者
Iida, K. [1 ]
Nagai, Y. [2 ,3 ]
Ishida, S. [4 ]
Ishikado, M. [1 ]
Murai, N. [5 ]
Christianson, A. D. [6 ,7 ]
Yoshida, H. [8 ]
Inamura, Y. [5 ]
Nakamura, H. [2 ]
Nakao, A. [1 ]
Munakata, K. [1 ]
Kagerbauer, D. [9 ]
Eisterer, M. [9 ]
Kawashima, K. [4 ,10 ]
Yoshida, Y. [4 ]
Eisaki, H. [4 ]
Iyo, A. [4 ]
机构
[1] CROSS, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan
[2] Japan Atom Energy Agcy, CCSE, Kashiwa, Chiba 2770871, Japan
[3] RIKEN Ctr Adv Intelligence Project AIP, Math Sci Team, Chuo Ku, 1-4-1 Nihonbashi, Tokyo 1030027, Japan
[4] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan
[5] J PARC Ctr, Mat & Life Sci Div, Tokai, Ibaraki 3191195, Japan
[6] Oak Ridge Natl Lab, Neutron Scattering Div, POB 2009, Oak Ridge, TN 37831 USA
[7] Oak Ridge Natl Lab, Mat Sci & Technol Div, POB 2009, Oak Ridge, TN 37831 USA
[8] Hokkaido Univ, Fac Sci, Dept Phys, Sapporo, Hokkaido 0600810, Japan
[9] TU Wien, Atominst, Stadionalle 2, A-1020 Vienna, Austria
[10] IMRA Mat R&D Co Ltd, Kariya, Aichi 4480032, Japan
基金
奥地利科学基金会;
关键词
NEUTRON-SCATTERING; EXCITATIONS; DYNAMICS;
D O I
10.1103/PhysRevB.100.014506
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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 T-c = 36.5 K, the INS spectra exhibit the neutron spin resonances at Q(res) = 1.27(2) and 1.79(3) angstrom(-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 neutron spin resonance is E-res = 17.7(3) meV corresponding to 5.7(1)k(B)T(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(+/-) superconducting pairing symmetry in EuRbFe4As4. In addition to the neutron spin resonance mode, upon decreasing temperature below the magnetic transition temperature T-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 k = (0, 0, 0.25), representing the three-dimensional antiferromagnetic order. Linear spin wave calculations assuming the obtained magnetic structure with the intra- and interplane nearest neighbor exchange couplings of J(1)/k(B) = -1.31 K and J(c)/k(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 EuRbFe4As4, whereas the coupling between them is rather weak.
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页数:8
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