Time-of-flight elastic and inelastic neutron scattering studies on the localized 4d electron layered perovskite La5Mo4O16

Kazuki Iida, Ryoichi Kajimoto, Yusuke Mizuno, Kazuya Kamazawa, Yasuhiro Inamura, Akinori Hoshikawa, Yukihiko Yoshida, Takeshi Matsukawa, Toru Ishigaki, Yukihiko Kawamura, Soshi Ibuka, Tetsuya Yokoo, Shinichi Itoh, Takuro Katsufuji

    Research output: Contribution to journalArticle

    Abstract

    The magnetic structure and spin-wave excitations in the quasi-square-lattice layered perovskite compound La5Mo4O16 were studied by a combination of neutron diffraction and inelastic neutron scattering techniques using polycrystalline sample. Neutron powder diffraction refinement revealed that the magnetic structure is ferrimagnetic in the ab plane with antiferromagnetic stacking along the c-axis where the magnetic propagation vector is k ¼ ð0;0;1=2Þ. The ordered magnetic moments are estimated to be 0.54(2)μB for Mo5+ (4d1) ions and 1.07(3)μB for Mo4+ (4d2) ions at 4K, which are about half of the expected values. The inelastic neutron scattering results display strong easy-axis magnetic anisotropy along the c-axis due to the spin–orbit interaction in Mo ions evidenced by the spin gap at the magnetic zone center. The model Hamiltonian consisting of in-plane anisotropic exchange interactions, the interlayer exchange interaction, and easy-axis single-ion anisotropy can explain our inelastic neutron scattering data well. Strong Ising-like anisotropy and weak interlayer coupling compared with the intralayer exchange interaction can explain both the high-temperature magnetoresistance and long-time magnetization decay recently observed in La5Mo4O16.

    Original languageEnglish
    Article number064803
    JournalJournal of the Physical Society of Japan
    Volume86
    Issue number6
    DOIs
    Publication statusPublished - 2017 Jun 15

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    inelastic scattering
    neutron scattering
    anisotropy
    interlayers
    ions
    electrons
    interactions
    wave excitation
    magnons
    neutron diffraction
    magnetic moments
    neutrons
    magnetization
    propagation
    decay
    diffraction

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Time-of-flight elastic and inelastic neutron scattering studies on the localized 4d electron layered perovskite La5Mo4O16 . / Iida, Kazuki; Kajimoto, Ryoichi; Mizuno, Yusuke; Kamazawa, Kazuya; Inamura, Yasuhiro; Hoshikawa, Akinori; Yoshida, Yukihiko; Matsukawa, Takeshi; Ishigaki, Toru; Kawamura, Yukihiko; Ibuka, Soshi; Yokoo, Tetsuya; Itoh, Shinichi; Katsufuji, Takuro.

    In: Journal of the Physical Society of Japan, Vol. 86, No. 6, 064803, 15.06.2017.

    Research output: Contribution to journalArticle

    Iida, K, Kajimoto, R, Mizuno, Y, Kamazawa, K, Inamura, Y, Hoshikawa, A, Yoshida, Y, Matsukawa, T, Ishigaki, T, Kawamura, Y, Ibuka, S, Yokoo, T, Itoh, S & Katsufuji, T 2017, 'Time-of-flight elastic and inelastic neutron scattering studies on the localized 4d electron layered perovskite La5Mo4O16 ', Journal of the Physical Society of Japan, vol. 86, no. 6, 064803. https://doi.org/10.7566/JPSJ.86.064803
    Iida, Kazuki ; Kajimoto, Ryoichi ; Mizuno, Yusuke ; Kamazawa, Kazuya ; Inamura, Yasuhiro ; Hoshikawa, Akinori ; Yoshida, Yukihiko ; Matsukawa, Takeshi ; Ishigaki, Toru ; Kawamura, Yukihiko ; Ibuka, Soshi ; Yokoo, Tetsuya ; Itoh, Shinichi ; Katsufuji, Takuro. / Time-of-flight elastic and inelastic neutron scattering studies on the localized 4d electron layered perovskite La5Mo4O16 In: Journal of the Physical Society of Japan. 2017 ; Vol. 86, No. 6.
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    abstract = "The magnetic structure and spin-wave excitations in the quasi-square-lattice layered perovskite compound La5Mo4O16 were studied by a combination of neutron diffraction and inelastic neutron scattering techniques using polycrystalline sample. Neutron powder diffraction refinement revealed that the magnetic structure is ferrimagnetic in the ab plane with antiferromagnetic stacking along the c-axis where the magnetic propagation vector is k ¼ {\dh}0;0;1=2{\TH}. The ordered magnetic moments are estimated to be 0.54(2)μB for Mo5+ (4d1) ions and 1.07(3)μB for Mo4+ (4d2) ions at 4K, which are about half of the expected values. The inelastic neutron scattering results display strong easy-axis magnetic anisotropy along the c-axis due to the spin–orbit interaction in Mo ions evidenced by the spin gap at the magnetic zone center. The model Hamiltonian consisting of in-plane anisotropic exchange interactions, the interlayer exchange interaction, and easy-axis single-ion anisotropy can explain our inelastic neutron scattering data well. Strong Ising-like anisotropy and weak interlayer coupling compared with the intralayer exchange interaction can explain both the high-temperature magnetoresistance and long-time magnetization decay recently observed in La5Mo4O16.",
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    AU - Iida, Kazuki

    AU - Kajimoto, Ryoichi

    AU - Mizuno, Yusuke

    AU - Kamazawa, Kazuya

    AU - Inamura, Yasuhiro

    AU - Hoshikawa, Akinori

    AU - Yoshida, Yukihiko

    AU - Matsukawa, Takeshi

    AU - Ishigaki, Toru

    AU - Kawamura, Yukihiko

    AU - Ibuka, Soshi

    AU - Yokoo, Tetsuya

    AU - Itoh, Shinichi

    AU - Katsufuji, Takuro

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    N2 - The magnetic structure and spin-wave excitations in the quasi-square-lattice layered perovskite compound La5Mo4O16 were studied by a combination of neutron diffraction and inelastic neutron scattering techniques using polycrystalline sample. Neutron powder diffraction refinement revealed that the magnetic structure is ferrimagnetic in the ab plane with antiferromagnetic stacking along the c-axis where the magnetic propagation vector is k ¼ ð0;0;1=2Þ. The ordered magnetic moments are estimated to be 0.54(2)μB for Mo5+ (4d1) ions and 1.07(3)μB for Mo4+ (4d2) ions at 4K, which are about half of the expected values. The inelastic neutron scattering results display strong easy-axis magnetic anisotropy along the c-axis due to the spin–orbit interaction in Mo ions evidenced by the spin gap at the magnetic zone center. The model Hamiltonian consisting of in-plane anisotropic exchange interactions, the interlayer exchange interaction, and easy-axis single-ion anisotropy can explain our inelastic neutron scattering data well. Strong Ising-like anisotropy and weak interlayer coupling compared with the intralayer exchange interaction can explain both the high-temperature magnetoresistance and long-time magnetization decay recently observed in La5Mo4O16.

    AB - The magnetic structure and spin-wave excitations in the quasi-square-lattice layered perovskite compound La5Mo4O16 were studied by a combination of neutron diffraction and inelastic neutron scattering techniques using polycrystalline sample. Neutron powder diffraction refinement revealed that the magnetic structure is ferrimagnetic in the ab plane with antiferromagnetic stacking along the c-axis where the magnetic propagation vector is k ¼ ð0;0;1=2Þ. The ordered magnetic moments are estimated to be 0.54(2)μB for Mo5+ (4d1) ions and 1.07(3)μB for Mo4+ (4d2) ions at 4K, which are about half of the expected values. The inelastic neutron scattering results display strong easy-axis magnetic anisotropy along the c-axis due to the spin–orbit interaction in Mo ions evidenced by the spin gap at the magnetic zone center. The model Hamiltonian consisting of in-plane anisotropic exchange interactions, the interlayer exchange interaction, and easy-axis single-ion anisotropy can explain our inelastic neutron scattering data well. Strong Ising-like anisotropy and weak interlayer coupling compared with the intralayer exchange interaction can explain both the high-temperature magnetoresistance and long-time magnetization decay recently observed in La5Mo4O16.

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