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Title: Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe 4 As 4

Abstract

Here, magnetic excitations and magnetic structure of EuRbFe 4As 4 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)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 neutron spin resonance is E res=17.7(3) meV corresponding to 5.7(1)k BT 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 EuRbFe 4As 4. 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=0.08more » K can reproduce quantitatively the observed spin wave excitation. Our findings show that superconductivity and long-range magnetic order of Eu coexist in EuRbFe 4As 4, whereas the coupling between them is rather weak.« less

Authors:
 [1];  [2];  [3];  [4];  [5]; ORCiD logo [6];  [7];  [5];  [8];  [4];  [4];  [9];  [9];  [10];  [3];  [3];  [3]
  1. Comprehensive Research Organization for Science and Society (CROSS), Ibaraki (Japan)
  2. Japan Atomic Energy Agency (JAEA), Chiba (Japan); RIKEN, Tokyo (Japan)
  3. National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan)
  4. Comprehensive Research Organization for Science and Society (CROSS), Ibaraki (Japan)
  5. J-PARC Center, Ibaraki (Japan)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  7. Hokkaido Univ., Sapporo (Japan)
  8. Japan Atomic Energy Agency (JAEA), Chiba (Japan)
  9. Univ. Wien (Austria)
  10. National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan); IMRA Material R&D Co., Ltd., Aichi (Japan)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1564231
Alternate Identifier(s):
OSTI ID: 1546288
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 1; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats

Iida, Kazuki, Nagai, Y., Ishida, S., Ishikado, Motoyuki, Murai, N., Christianson, Andrew D., Yoshida, Hiroyuki, Inamura, Yasuhiro, Nakamura, Hirohiko, Nakao, A., Munakata, Koji, Kagerbauer, D., Eisterer, M., Kawashima, K., Yoshida, Y., Eisaki, Hiroshi, and Iyo, Akira. Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe4As4. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.014506.
Iida, Kazuki, Nagai, Y., Ishida, S., Ishikado, Motoyuki, Murai, N., Christianson, Andrew D., Yoshida, Hiroyuki, Inamura, Yasuhiro, Nakamura, Hirohiko, Nakao, A., Munakata, Koji, Kagerbauer, D., Eisterer, M., Kawashima, K., Yoshida, Y., Eisaki, Hiroshi, & Iyo, Akira. Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe4As4. United States. doi:10.1103/PhysRevB.100.014506.
Iida, Kazuki, Nagai, Y., Ishida, S., Ishikado, Motoyuki, Murai, N., Christianson, Andrew D., Yoshida, Hiroyuki, Inamura, Yasuhiro, Nakamura, Hirohiko, Nakao, A., Munakata, Koji, Kagerbauer, D., Eisterer, M., Kawashima, K., Yoshida, Y., Eisaki, Hiroshi, and Iyo, Akira. Mon . "Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe4As4". United States. doi:10.1103/PhysRevB.100.014506.
@article{osti_1564231,
title = {Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe4As4},
author = {Iida, Kazuki and Nagai, Y. and Ishida, S. and Ishikado, Motoyuki and Murai, N. and Christianson, Andrew D. and Yoshida, Hiroyuki and Inamura, Yasuhiro and Nakamura, Hirohiko and Nakao, A. and Munakata, Koji and Kagerbauer, D. and Eisterer, M. and Kawashima, K. and Yoshida, Y. and Eisaki, Hiroshi and Iyo, Akira},
abstractNote = {Here, 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) 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 neutron spin resonance is Eres=17.7(3) meV corresponding to 5.7(1)kBTc. 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 TN=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 J1/kB=–1.31 K and Jc/kB=0.08 K can reproduce quantitatively the observed spin wave excitation. Our findings show that superconductivity and long-range magnetic order of Eu coexist in EuRbFe4As4, whereas the coupling between them is rather weak.},
doi = {10.1103/PhysRevB.100.014506},
journal = {Physical Review B},
number = 1,
volume = 100,
place = {United States},
year = {2019},
month = {7}
}

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