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arXiv · 1705.07916

Time-of-flight elastic and inelastic neutron scattering studies on the localized $4d$ electron layered perovskite La$_5$Mo$_4$O$_{16}$

K. Iida·R. Kajimoto·Y. Mizuno·K. Kamazawa·Y. Inamura·A. Hoshikawa·Y. Yoshida·T. Matsukawa·T. Ishigaki·Y. Kawamura·S. Ibuka·T. Yokoo·S. Itoh·T. Katsufuji
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Abstract

The magnetic structure and spin-wave excitations in the quasi-square-lattice layered perovskite compound La$_5$Mo$_4$O$_{16}$ 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 $\mathbf{k}=\left(0,0,\frac{1}{2}\right)$. The ordered magnetic moments are estimated to be $0.54(2)\mu_\text{B}$ for Mo$^{5+}$ ($4d^1$) ions and $1.07(3)\mu_\text{B}$ for Mo$^{4+}$ ($4d^2$) ions at 4 K, 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 La$_5$Mo$_4$O$_{16}$.

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K. Iida, R. Kajimoto, Y. Mizuno, K. Kamazawa, Y. Inamura, A. Hoshikawa, Y. Yoshida, T. Matsukawa, T. Ishigaki, Y. Kawamura, S. Ibuka, T. Yokoo, S. Itoh, T. Katsufuji. 2017-05-22. Time-of-flight elastic and inelastic neutron scattering studies on the localized $4d$ electron layered perovskite La$_5$Mo$_4$O$_{16}$. https://doi.org/10.7566/jpsj.86.064803

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