Browsing by Author "Kawano-Furukawa, H"

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    Flux line lattice structure in YNi2B2C
    (Physical Society of Japan, 2008-10) Kawano-Furukawa, H; Ohira-Kawamura, S; Tsukagoshi, H; Kobayashi, C; Nagata, T; Sakiyama, N; Yoshizawa, H; Yethiraj, M; Suzuki, J; Takeya, H
    Recently Nakai et at. reported a theoretical H-T phase diagram of flux line lattice (FLL) structure in which successive transitions from a triangular, a square (square(v)), a triangular and another square (square(g)) occur with increasing a magnetic field. Here square(v) and square(g) indicate the FLL structures reflecting anisotropies in the Fermi velocity and the superconducting gap, respectively. In the case of YNi2B2C, square(v) and square(g) should rotate by 45 degrees. The low field transition from triangular to square(v) is observed in RENi2B2C (RE = Er, Tm, Lu, and Y). However, there is no experimental evidence for the appearance of square(g) phase so far. We studied the FLL structure of YNi2B2C in the higher field region by small-angle neutron scattering. Our results show that a large area of the H-T phase diagram is occupied by square(v) phase and there is no evidence for the appearance of square(g) lattice. © 2008, Physical Society of Japan
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    Neutron scattering study of the quasi-one-dimensional antiferromagnet Ba2CoSi2O7
    (American Physical Society, 2019-10-07) Soda, M; Hong, T; Avdeev, M; Yoshizawa, H; Masuda, T; Kawano-Furukawa, H
    Magnetization and neutron scattering measurements have been carried out on an antiferromagnet Ba2CoSi2O7. The observed magnetic excitation is almost dispersionless, and the neutron intensity is only modulated along the [101] direction. The dispersionless magnetic excitation suggest that the Ba2CoSi2O7 system is a quasi-one-dimensional antiferromagnet. Classical spin-wave theory for a one-dimensional antiferromagnet can explain the dispersionless spin excitation. The magnetic structure determined by the measurement of the neutron powder diffraction is consistent with no observation of the multiferroic property in this system. ©2019 American Physical Society