Ikuto Kawasaki
Hokkaido University
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Featured researches published by Ikuto Kawasaki.
Journal of the Physical Society of Japan | 2004
Makoto Yokoyama; H. Amitsuka; Seiichiroh Itoh; Ikuto Kawasaki; Kenichi Tenya; Hideki Yoshizawa
We have performed elastic and inelastic neutron scattering experiments on solid solutions of U(Ru 1- x Rh x ) 2 Si 2 with Ru-rich concentrations: x =0, 0.01, 0.02, 0.025, 0.03, 0.04 and 0.05. Hidden order is suppressed with increasing x , and correspondingly, the onset temperature T m (∼17.5 K at x =0) of weak antiferromagnetic (AF) Bragg reflection decreases. For x =0.04 and 0.05, no magnetic order is detected in the investigated temperature range down to 1.4 K. In the intermediate range, 0.02 ≤ x ≤0.03, we found that the AF Bragg reflection is strongly enhanced. At x =0.02, this enhancement takes place at ∼7.7 K (≡ T M ), which is significantly lower than T m (∼ 13.7 K). T M increases with increasing x , and seems to merge with T m at x =0.03. If the AF state is assumed to be homogeneous, the staggered moment µ o estimated at 1.4 K increases from 0.02(2) µ B /U ( x =0) to 0.24(1) µ B /U ( x =0.02). The behavior is similar to that observed under hydrostatic pressure (µ o increases to ∼0.25 µ B /U at 1.0 ...
Journal of the Physical Society of Japan | 2012
Shin-ichi Fujimori; Takuo Ohkochi; Ikuto Kawasaki; Akira Yasui; Yukiharu Takeda; Tetsuo Okane; Y. Saitoh; Atsushi Fujimori; Hiroshi Yamagami; Yoshinori Haga; Etsuji Yamamoto; Yoshifumi Tokiwa; Shugo Ikeda; Takashi Sugai; Hitoshi Ohkuni; Noriaki Kimura; Y. Ōnuki
High-energy-resolution core-level and valence-band photoelectron spectroscopic studies were performed for the heavy fermion uranium compounds UGe 2 , UCoGe, URhGe, URu 2 Si 2 , UNi 2 Al 3 , UPd 2 Al 3 , and UPt 3 as well as typical localized and itinerant uranium compounds to understand the relationship between the uranium valence state and their core-level spectral line shapes. In addition to the main line and high-binding energy satellite structure recognized in the core-level spectra of uranium compounds, a shoulder structure on the lower binding energy side of the main lines of localized and nearly localized uranium compounds was also found. The spectral line shapes show a systematic variation depending on the U 5 f electronic structure. The core-level spectra of UGe 2 , UCoGe, URhGe, URu 2 Si 2 , and UNi 2 Al 3 are rather similar to those of itinerant compounds, suggesting that U 5 f electrons in these compounds are well hybridized with ligand states. On the other hand, the core-level spectra of UPd ...
Journal of the Physical Society of Japan | 2006
Makoto Yokoyama; H. Amitsuka; K.-I. Matsuda; A. Gawase; N. Oyama; Ikuto Kawasaki; Kenichi Tenya; Hideki Yoshizawa
We performed elastic neutron scattering experiments on solid solution CeRh 1- x Co x In 5 with x =0.4 to clarify the nature of the antiferromagnetic (AF) phase in the vicinity of the quantum critic...
Physical Review B | 2014
Shin-ichi Fujimori; Ikuto Kawasaki; Akira Yasui; Yukiharu Takeda; Tetsuo Okane; Y. Saitoh; Atsushi Fujimori; Hiroshi Yamagami; Yoshinori Haga; Etsuji Yamamoto; Y. Ōnuki
The electronic structure of the ferromagnetic superconductor URhGe in the paramagnetic phase has been studied by angle-resolved photoelectron spectroscopy using soft x rays (
Physical Review B | 2013
Hanjie Guo; Hiroshi Tanida; Riki Kobayashi; Ikuto Kawasaki; Masafumi Sera; Takashi Nishioka; Masahiro Matsumura; Isao Watanabe; Zhu-An Xu
h\ensuremath{\nu}=595
Physical Review B | 2015
Shin-ichi Fujimori; Takuo Ohkochi; Ikuto Kawasaki; Akira Yasui; Yukiharu Takeda; Tetsuo Okane; Y. Saitoh; Atsushi Fujimori; Hiroshi Yamagami; Yoshinori Haga; Etsuji Yamamoto; Y. Ōnuki
--700 eV). Dispersive bands with large contributions from U 5
Physical Review B | 2013
Hanjie Guo; Kazuyuki Matsuhira; Ikuto Kawasaki; Makoto Wakeshima; Yukio Hinatsu; Isao Watanabe; Zhu-An Xu
f
Journal of the Physical Society of Japan | 2014
Ikuto Kawasaki; Isao Watanabe; A. D. Hillier; Dai Aoki
states were observed in the ARPES spectra and form Fermi surfaces. The band structure in the paramagnetic phase is partly explained by the band-structure calculation treating all U 5
Solid State Communications | 2009
Hiroyoshi Nobukane; Katsuhiko Inagaki; K. Ichimura; Kazuhiko Yamaya; S. Takayanagi; Ikuto Kawasaki; Kenichi Tenya; H. Amitsuka; Kohkichi Konno; Yasuhiro Asano; Satoshi Tanda
f
Journal of the Physical Society of Japan | 2014
Makoto Yokoyama; Kenji Fujimura; Sara Ishikawa; Masashi Kimura; Takeshi Hasegawa; Ikuto Kawasaki; Kenichi Tenya; Yohei Kono; Toshiro Sakakibara
electrons as being itinerant, suggesting that an itinerant description of U 5