W. Higemoto
Japan Atomic Energy Research Institute
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Publication
Featured researches published by W. Higemoto.
Journal of the Physical Society of Japan | 2005
Akihiro Koda; W. Higemoto; Kazuki Ohishi; Shanta Saha; Ryosuke Kadono; Shigeki Yonezawa; Yuji Muraoka; Zenji Hiroi
Magnetic penetration depth (λ eff ) in a pyrochlore superconductor KOs 2 O 6 was studied by means of muon spin rotation (µSR). The temperature dependence of the transverse spin relaxation rate, which is proportional to λ eff -2 , exhibits a considerable deviation from that expected for the empirical two-fluid model (∝ T 4 ), obeying a T 2 tendency. Furthermore, λ eff apparently increases with increasing applied field, suggesting the presence of nonlinear and nonlocal effects. The present result strongly suggests that the superconducting order parameter in KOs 2 O 6 is anisotropic or multigapped with a small energy gap.
Journal of the Physical Society of Japan | 2005
Ryosuke Kadono; Kazuki Ohishi; Akihiro Koda; Shanta Saha; W. Higemoto; Masaki Fujita; K. Yamada
A strong correlation between field-induced antiferromagnetic (AF) order and superconductivity is demonstrated for an electron-doped cuprate superconductor, Pr 1- x LaCe x CuO 4-δ (PLCCO). In additi...
Science and Technology of Advanced Materials | 2006
S. Kuroiwa; Hiroyuki Takagiwa; M. Yamazawa; Jun Akimitsu; Akihiro Koda; Ryosuke Kadono; K. Ohishi; W. Higemoto; I. Watanabe
Abstract The temperature dependence of muon spin relaxation rate exhibits a significant increase below ~130 K in CaB6 and ~110 K in BaB6, while no sigh of spontaneous muon precession signal under a zero field is observed. Moreover, the electric field gradient at the boron site measured by muon level-crossing resonance (µLCR) exhibits a step like change at ~110 K in CaB6. These results suggest a change in electronic state and the associated emergence of weak random magnetism below 110–130 K in these alkaline earth hexaborides.
LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 | 2006
Hikomitsu Kikuchi; W. Higemoto; K. Nishiyama
We report magnetic susceptibility, zero field (ZF) and longitudinal field (LF) muon spin relaxation (μSR) measurements on LiCrTiO4, which is a frustrated antiferromagnet with a spinel type crystal structure. The spin freezing transition is found to occur at 2.7 K in a field of 30 Oe. A fast relaxation in ZF‐μSR develops at around the spin freezing temperature. Spin fluctuations persist even below the spin freezing temperature.
Physica B-condensed Matter | 2006
Kazuhiko Satoh; Hidemi Fujita; Ryosuke Sato; Hiromi Taniguchi; W. Higemoto
Physica B-condensed Matter | 2006
Kazuhiko Satoh; Hiromi Taniguchi; Atsushi Kawamoto; W. Higemoto
Journal of Physics: Condensed Matter | 2005
Akihiro Koda; R. Kadono; Kazuki Ohishi; Shanta Saha; W. Higemoto; Yoshitaka Matsushita; Y. Ueda
Physica C-superconductivity and Its Applications | 2007
Kazuyasu Tokiwa; S. Mikusu; W. Higemoto; K. Nishiyama; Akira Iyo; Yasumoto Tanaka; Hisashi Kotegawa; Hidekazu Mukuda; Y. Kitaoka; T. Watanabe
Journal of Magnetism and Magnetic Materials | 2007
K. Ishida; W. Higemoto; K. Ohishi; Akihiro Koda; K.H. Satoh; Ryosuke Kadono; Masaki Fujita; K. Yamada
Physica B-condensed Matter | 2005
Y. Aoki; W. Higemoto; S. Sanada; Kazuki Ohishi; Shanta Saha; Akihiro Koda; K. Nishiyama; R. Kadono; Hitoshi Sugawara; H. Sato
