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

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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  • Cite this

    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, 86(6), [064803]. https://doi.org/10.7566/JPSJ.86.064803