Browsing by Author "Munakata, K"

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Block magnetism coupled with local distortion in the iron-based spin-ladder compound BaFe 2 Se 3
    (American Physical Society, 2012-02-22) Nambu, Y; Ohgushi, K; Suzuki, S; Du, F; Avdeev, M; Uwatoko, Y; Munakata, K; Fukazawa, H; Chi, S; Ueda, Y; Sato, TJ
    Magnetism in the insulating BaFe2Se3 was examined through susceptibility, specific heat, resistivity, and neutron diffraction measurements. After formation of a short-range magnetic correlation, a long-range ordering was observed below TN∼255 K. The transition is obscured by bulk properties. Magnetic moments (∥a) are arranged to form a Fe4 ferromagnetic unit, and each Fe4 stacks antiferromagnetically. This block magnetism is of the third type among magnetic structures of ferrous materials. The magnetic ordering drives unusually large distortion via magnetoelastic coupling. ©2012 American Physical Society
  • No Thumbnail Available
    Item
    Relief of spin frustration through magnetic anisotropy in the quasi-one-dimensional 𝑆= 1/2 antiferromagnet Na2⁢CuSO4⁢Cl2
    (American Physical Society (APS), 2022-03-29) Fujihala, M; Sakuma, Y; Mitsuda, S; Nakao, A; Munakata, K; Mole, RA; Yano, S; Yu, DH; Takehana, K; Imanaka, Y; Akaki, M; Okubo, S; Ohta, H
    We report the magnetic structure and anisotropy of the quasi-one-dimensional S=12 antiferromagnet Na2CuSO4Cl2 obtained by single-crystal neutron scattering, electron spin resonance (ESR), and magnetization measurements, following an earlier study of its dynamics [M. Fujihala, Phys. Rev. B 101, 024410 (2020)10.1103/PhysRevB.101.024410]. A Néel-Type spin structure is formed within the chain of this compound, where the spins point along the b axis, and ESR data indicate an antisymmetric exchange with a uniform Dzyaloshinskii-Moriya (DM) vector pointing along the b axis. The anisotropy g factor and magnetic structure are strong indicators of magnetic anisotropy originating from a symmetric anisotropic exchange interaction and/or a magnetic dipole interaction. These results suggest that these terms of the anisotropic spin Hamiltonian counteract the effect of the DM interaction and stabilize the Néel-Type structure in Na2CuSO4Cl2. ©2022 American Physical Society.