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Title: Polarized neutron scattering study of the multiple order parameter system NdB 4 [Polarized neutron scattering study on multiple order parameter system NdB 4 ]

Abstract

Neutron polarization analysis has been carried out in order to clarify the magnetic structures of multiple order parameter f-electron system NdB 4. We confirmed the noncollinear “all-in all-out” structure (Γ 4) of the in-plane moment, which is in good agreement with our previous neutron powder diffraction study. We found that the magnetic moment along the c-axis m c showed diagonally antiferromagnetic structure (Γ 10), inconsistent with previously reported “vortex” structure (Γ 2). The microscopic mixture of these two structures with q 0=(0,0,0) appears in phase II and remains stable in phases III and IV, where an incommensurate modulation coexists. The unusual magnetic ordering is phenomenologically understood via Landau theory with the primary order parameter Γ 4 coupled with higher-order secondary order parameter Γ 10. The magnetic moments were estimated to be 1.8 ± 0.2 and 0.2 ± 0.05μ B at T = 7.5K for Γ 4 and Γ 10, respectively. We also found a long-period incommensurate modulation of the q 1=(0,0,1/2) antiferromagnetic structure of mc with the propagation q s1=(0.14,0.14,0.1) and q s2=(0.2,0,0.1) in phase III and IV, respectively. The amplitude of sinusoidal modulation was about m c=1.0 ± 0.2μ B at T=1.5 K. The local (0,0,1/2) structure consists ofmore » in-plane ferromagnetic and out-of-plane antiferromagnetic coupling of m c, opposite to the coexisting Γ 10. The mc of Γ 10 is significantly enhanced up to 0.6μ B at T=1.5 K, which is accompanied by the incommensurate modulations. As a result, the Landau phenomenological approach indicates that the higher-order magnetic and/or multipole interactions based on the pseudoquartet f-electron state play important roles.« less

Authors:
 [1];  [2]; ORCiD logo [3]; ORCiD logo [3];  [4];  [5]
  1. Japan Atomic Energy Agency (JAEA), Tokai (Japan); Ibaraki Uiv., Ibaraki (Japan)
  2. Japan Atomic Energy Agency (JAEA), Tokai (Japan)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Yokohama National Univ., Yokohama (Japan)
  5. Univ. of Tokyo, Chiba (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)
OSTI Identifier:
1440823
Alternate Identifier(s):
OSTI ID: 1437506
Grant/Contract Number:  
[AC05-00OR22725]
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
[ Journal Volume: 97; Journal Issue: 17]; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Metoki, Naoto, Yamauchi, Hiroki, Matsuda, Masaaki, Fernandez-Baca, Jaime A., Watanuki, Ryuta, and Hagihala, Masato. Polarized neutron scattering study of the multiple order parameter system NdB4 [Polarized neutron scattering study on multiple order parameter system NdB4]. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.174416.
Metoki, Naoto, Yamauchi, Hiroki, Matsuda, Masaaki, Fernandez-Baca, Jaime A., Watanuki, Ryuta, & Hagihala, Masato. Polarized neutron scattering study of the multiple order parameter system NdB4 [Polarized neutron scattering study on multiple order parameter system NdB4]. United States. doi:10.1103/PhysRevB.97.174416.
Metoki, Naoto, Yamauchi, Hiroki, Matsuda, Masaaki, Fernandez-Baca, Jaime A., Watanuki, Ryuta, and Hagihala, Masato. Thu . "Polarized neutron scattering study of the multiple order parameter system NdB4 [Polarized neutron scattering study on multiple order parameter system NdB4]". United States. doi:10.1103/PhysRevB.97.174416. https://www.osti.gov/servlets/purl/1440823.
@article{osti_1440823,
title = {Polarized neutron scattering study of the multiple order parameter system NdB4 [Polarized neutron scattering study on multiple order parameter system NdB4]},
author = {Metoki, Naoto and Yamauchi, Hiroki and Matsuda, Masaaki and Fernandez-Baca, Jaime A. and Watanuki, Ryuta and Hagihala, Masato},
abstractNote = {Neutron polarization analysis has been carried out in order to clarify the magnetic structures of multiple order parameter f-electron system NdB4. We confirmed the noncollinear “all-in all-out” structure (Γ4) of the in-plane moment, which is in good agreement with our previous neutron powder diffraction study. We found that the magnetic moment along the c-axis mc showed diagonally antiferromagnetic structure (Γ10), inconsistent with previously reported “vortex” structure (Γ2). The microscopic mixture of these two structures with →q0=(0,0,0) appears in phase II and remains stable in phases III and IV, where an incommensurate modulation coexists. The unusual magnetic ordering is phenomenologically understood via Landau theory with the primary order parameter Γ4 coupled with higher-order secondary order parameter Γ10. The magnetic moments were estimated to be 1.8 ± 0.2 and 0.2 ± 0.05μB at T = 7.5K for Γ4 and Γ10, respectively. We also found a long-period incommensurate modulation of the →q1=(0,0,1/2) antiferromagnetic structure of mc with the propagation →qs1=(0.14,0.14,0.1) and →qs2=(0.2,0,0.1) in phase III and IV, respectively. The amplitude of sinusoidal modulation was about mc=1.0 ± 0.2μB at T=1.5 K. The local (0,0,1/2) structure consists of in-plane ferromagnetic and out-of-plane antiferromagnetic coupling of mc, opposite to the coexisting Γ10. The mc of Γ10 is significantly enhanced up to 0.6μB at T=1.5 K, which is accompanied by the incommensurate modulations. As a result, the Landau phenomenological approach indicates that the higher-order magnetic and/or multipole interactions based on the pseudoquartet f-electron state play important roles.},
doi = {10.1103/PhysRevB.97.174416},
journal = {Physical Review B},
number = [17],
volume = [97],
place = {United States},
year = {2018},
month = {5}
}

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Figures / Tables:

FIG. 1 FIG. 1: (Color online) Spin polarized neutron scattering profile of the (1, 1, 0) refection of NdB4 measured at (a) T = 1.5 K in phase IV, (b) T = 6.0 K in phase III, (c) T = 7.5 K in phase II, and (d) T = 20 K inmore » the paramagnetic phase I.« less

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