hamon
Online ISSN : 1884-636X
Print ISSN : 1349-046X
ISSN-L : 1349-046X
Volume 29 , Issue 1
Showing 1-9 articles out of 9 articles from the selected issue
  • Keisuke Matsuura, Hajime Sagayama, Taka-hisa Arima
    2019 Volume 29 Issue 1 Pages 4-11
    Published: February 10, 2019
    Released: June 01, 2020
    JOURNALS FREE ACCESS

      We investigated the magnetic excitations and lattice vibrations in a spinel-type vanadium oxide MnV2O4 by using inelastic neutron and x-ray scattering. We discovered magnetic excitations which were not reproduced by the linear spin-wave calculation. We also confirmed that the excitation modes were not explained by the simple lattice vibration, since the dispersion and the scattering intensity are different from those obtained from inelastic neutron scattering experiment. Therefore, we proposed that the observed excitation was related to the orbital excitation mode coupling with the spin-wave excitation via spin-orbital exchange interaction and the relativistic spin-orbit interaction.

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  • Yusuke Kousaka
    2019 Volume 29 Issue 1 Pages 12-16
    Published: February 10, 2019
    Released: June 01, 2020
    JOURNALS FREE ACCESS

    We report enantiopure crystal growth and chiral helimagnetic ordering in a chiral inorganic compound CsCuCl3 with a chiral space group of right-handed P6122 or left-handed P6522. Our two-step crystal growth technique makes it possible to grow centimeter sized enantiopure single crystals. First, millimeter-sized seed crystals were synthesized by spontaneous crystallization with stirring. Then, centimeter-sized homo-chiral crystals were obtained from the selected enantiopure seed crystals. Polarized neutron diffraction experiments probed that the right-handed crystal forms purely right-handed helimagnetic structure, and the left-handed crystal forms purely left-handed helimagnetic structure. Therefore, crystallographic chirality of CsCuCl3 strongly combined with helimagnetic chirality via Dzyalloshinskii-Moriya interaction.

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  • Go Matsuba
    2019 Volume 29 Issue 1 Pages 17-21
    Published: February 10, 2019
    Released: June 01, 2020
    JOURNALS FREE ACCESS

    In this study, we evaluated the effect of molecular weight on the formation of a shish–kebab morphology on a wide spatial scale. Here we examined blended polyethylene with 97 wt% deuterated polyethylene and 3 wt% protonated polyethylene comprising molecules with a range of molecular weights. Measurements were conducted with various X-ray and neutron scattering techniques. The nanometer-scale analysis revealed that the crystal lattice is also independent of the molecular weight. Moreover, small-angle X-ray and neutron scattering measurements did not reveal any influence of molecular weight.

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  • Kenta Amemiya, Masako Suzuki-Sakamaki
    2019 Volume 29 Issue 1 Pages 22-27
    Published: February 10, 2019
    Released: June 01, 2020
    JOURNALS FREE ACCESS

    A twisted magnetic structure in a Ni film attached to an antiferromagnetic FeMn layer is suggested by a complimentary use of the polarized neutron reflectivity (PNR) and the depth-resolved X-ray magnetic circular dichroism (XMCD) techniques. The depth-resolved XMCD shows that the perpendicular magnetization component in the Ni film decreases around the interface to FeMn, while the PNR data indicates that an in-plane magnetization component is induced in Ni around the interface to FeMn by weak in-plane magnetic fields. These results are reasonably interpreted by assuming that the magnetic moment in the Ni layer is twisted from the perpendicular to the in-plane directions towards the interface to FeMn.

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  • Shun Asano, Masaki Fujita
    2019 Volume 29 Issue 1 Pages 28-32
    Published: February 10, 2019
    Released: June 01, 2020
    JOURNALS FREE ACCESS

    In this article, we introduce recent studies of reduction annealing effects on physical properties in T’-structured cuprate oxide using quantum beam spectroscopy. Our Cu K-edge x-ray absorption near-edge structure (XANES) study on the electronic states of T’-structured Pr2-xCexCuO4+α-δ clearly shows increase of number of electron at the copper sites due to annealing, similar to the case of Ce substitution. The qualitative analyses, furthermore, suggest the emergence of holes as well as electrons in the heavily Ce-doped Pr2-xCexCuO4+α-δ due to annealing. The role of annealing procedure, which is necessary for the appearance of superconductivity in T’-structured cuprates, is discussed in connection with recent photoemission spectroscopy and muon spin relaxation/rotation studies.

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