Polarized neutron scattering study of the multiple order parameter system NdB4 [Polarized neutron scattering study on multiple order parameter system NdB4]

Metoki, Naoto; Yamauchi, Hiroki; Matsuda, Masaaki; Fernandez-Baca, Jaime A.; Watanuki, Ryuta; Hagihala, Masato

doi:10.1103/PhysRevB.97.174416

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

Journal Article · Thu May 17 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.97.174416· OSTI ID:1440823

Metoki, Naoto ^[1]; Yamauchi, Hiroki ^[2];

^[3];

^[3]; Watanuki, Ryuta ^[4]; Hagihala, Masato ^[5]

Japan Atomic Energy Agency (JAEA), Tokai (Japan); Ibaraki Uiv., Ibaraki (Japan)
Japan Atomic Energy Agency (JAEA), Tokai (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Yokohama National Univ., Yokohama (Japan)
Univ. of Tokyo, Chiba (Japan)

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 m_c 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 ± 0.05μ_B 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 ^→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 of in-plane ferromagnetic and out-of-plane antiferromagnetic coupling of m_c, opposite to the coexisting Γ₁₀. The mc of Γ₁₀ 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.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1440823

Alternate ID(s):: OSTI ID: 1437506

Journal Information:: Physical Review B, Vol. 97, Issue 17; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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