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Murase, Satoshi*; Yoshikawa, Yumi*; Fujiwara, Kosuke*; Fukada, Yukimasa*; Teranishi, Takashi*; Kano, Jun*; Fujii, Tatsuo*; Inada, Yasuhiro*; Katayama, Misaki*; Yoshii, Kenji; et al.
Journal of Physics and Chemistry of Solids, 162, p.110468_1 - 110468_6, 2022/03
Times Cited Count:0 Percentile:0.00(Chemistry, Multidisciplinary)We report a trial of the valence control for mixed valence iron triangular oxide YbFeO in order to develop an effective technique to control the frustration of charges in strongly correlated electron systems. The electro-chemical doping of Li into YbFeO was examined on the cell type sample similar to the Li-ion secondary battery cell. Systematic change of the lattice constant, Fe-Fe and Fe-Yb distance were observed with Li doping. Maximum value of the doping was over 300 mAh/g. An EXAFS experiment indicated that Li positioned between Yb octahedron layer (U-layer) and Fe-bipyramidal layer (W-layer). However, detailed change of iron valence state of YbFeO was not clearly observed because of the superimpose of the signal from iron metal nano particles in XANES observation. The results indicate that the electrochemical method might be one of the potential technique to control the frustration of charges in YbFeO.
Tsutsui, Satoshi; Higashinaka, Ryuji*; Nakamura, Raito*; Fujiwara, Kosuke*; Nakamura, Jin*; Kobayashi, Yoshio*; Ito, Takashi; Yoda, Yoshitaka*; Kato, Kazuo*; Nitta, Kiyofumi*; et al.
Hyperfine Interactions, 242(1), p.32_1 - 32_10, 2021/12
Times Cited Count:1 Percentile:84.11(Physics, Atomic, Molecular & Chemical)Fukada, Yukimasa*; Fukuyama, Ryota*; Fujiwara, Kosuke*; Yoshii, Kenji; Shigematsu, Kei*; Azuma, Masaki*; Ikeda, Naoshi*
Journal of the Physical Society of Japan, 90(2), p.024710_1 - 024710_6, 2021/02
Times Cited Count:2 Percentile:28.62(Physics, Multidisciplinary)We report an analysis of the dielectric glasslike state of the spin- and charge-ordered system LuFeO, which has structural and physical properties analogous to those of the electronic ferroelectrics FeO (: rare earth). Aging and memory effects of resistivity were found in the electric impedance response. We performed a numerical analysis with equivalent electric circuits that have a logarithmic Gaussian distribution of resistance and capacitance. The distribution parameters well explained the glassy nature of the electric and dielectric properties between 100 and 200 K and the distribution variations of charge- and magnetic-ordered domains underlying the glass nature.
Li, T.*; Garg, U.*; Liu, Y.*; Marks, R.*; Nayak, B. K.*; Madhusudhana Rao, P. V.*; Fujiwara, Mamoru*; Hashimoto, Hisanobu*; Nakanishi, Kosuke*; Okumura, Shun*; et al.
Physical Review C, 81(3), p.034309_1 - 034309_11, 2010/03
Times Cited Count:107 Percentile:97.51(Physics, Nuclear)Hayakawa, Takehito; Miyamoto, Shuji*; Hayashi, Yukio; Kawase, Keigo*; Horikawa, Ken*; Chiba, Satoshi; Nakanishi, Kosuke*; Hashimoto, Hisanobu*; Ota, Takeshi*; Kando, Masaki; et al.
Physical Review C, 74(6), p.065802_1 - 065802_5, 2006/12
Times Cited Count:29 Percentile:82.68(Physics, Nuclear)We report a half-life of the ground state of Re populated by the ReRe reaction with the laser Compton scattering -rays generated through relativistic engineering. The -rays are provided at the electron storage ring NewSUBARU. The previous experiment using deuteron-induced reactions has yielded a recommended half-life of the 3 ground state of Re to be 38.0 0.5 d, including a possible contribution from the 8 isomer ( = 169 8 d) of Re since the presence of the isomer was not known at that time. In contrast, the reaction has an advantage to selectively populate the ground state because this reaction does not bring large angular momentum. The measured half-life of 35.4 0.7 d is shorter than the previous half-life by about 7%. This difference is crucial for applications using the activation method.
Nakayama, Shintaro*; Yamagata, Tamio*; Akimune, Hidetoshi*; Fujiwara, Mamoru; Fushimi, Kenichi*; Greenfield, M. B.*; Hara, Keigo*; Hara, Kaoru*; Hashimoto, Hisanobu*; Ichihara, Kayoko*; et al.
Nuclear Physics A, 731, p.355 - 362, 2004/02
Times Cited Count:0 Percentile:0.01(Physics, Nuclear)no abstracts in English
Zegers, R. G. T.*; Abend, H.*; Akimune, Hidetoshi*; Van den Berg, A. M.*; Fujimura, Hisako*; Fujita, Hirohiko*; Fujita, Yoshitaka*; Fujiwara, Mamoru; Gals, S.*; Hara, Keigo*; et al.
Nuclear Physics A, 731, p.121 - 128, 2004/02
Times Cited Count:11 Percentile:56.77(Physics, Nuclear)no abstracts in English
Hara, Keigo*; Adachi, Takeshi*; Akimune, Hidetoshi*; Daito, Izuru*; Fujimura, Hisako*; Fujita, Yoshitaka*; Fujiwara, Mamoru; Fushimi, Kenichi*; Hara, Kaoru*; Harakeh, M. N.*; et al.
Physical Review C, 68(6), p.064612_1 - 064612_9, 2003/12
Times Cited Count:11 Percentile:57.99(Physics, Nuclear)no abstracts in English
Zegers, R. G. T.; Abend, H.*; Akimune, Hidetoshi*; Van den Berg, A. M.*; Fujimura, Hisako*; Fujita, Hirohiko*; Fujita, Yoshitaka*; Fujiwara, Mamoru; Gals, S.*; Hara, Keigo*; et al.
Physical Review Letters, 90(20), p.202501_1 - 202501_4, 2003/05
Times Cited Count:49 Percentile:84.91(Physics, Multidisciplinary)no abstracts in English
Fukada, Yukimasa; Kawasaki, Ikuto; Fukuda, Tatsuo; Yu, H.*; Fujiwara, Kosuke*; Matsumura, Daiju; Yoshii, Kenji; Ikeda, Naoshi*
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Fujiwara, Kosuke*; Yu, H.*; Kimura, Akito*; Fukada, Yukimasa; Ikeda, Naoshi*; Okimoto, Yoichi*; Frontzek, M. D.*; Kakurai, Kazuhisa*
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Yu, H.*; Yano, Yuta*; Park, G.*; Okimoto, Yoichi*; Shimanuki, Shuhei*; Fukada, Yukimasa; Fujiwara, Kosuke*; Ikeda, Naoshi*
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Yano, Yuta*; Yu, H.*; Park, G.*; Matsuda, Rikako*; Okimoto, Yoichi*; Fukada, Yukimasa; Fujiwara, Kosuke*; Nakao, Hironori*; Fukaya, Ryo*; Fujii, Tatsuo*; et al.
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Yu, H.*; Park, G.*; Yano, Yuta*; Ikeda, Naoshi*; Fukada, Yukimasa; Fujiwara, Kosuke*; Wang, X.*; Shimanuki, Shuhei*; Okimoto, Yoichi*
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no abstracts in English
Fukada, Yukimasa*; Fukuyama, Ryota*; Fujiwara, Kosuke*; Yoshii, Kenji; Ikeda, Naoshi*
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Fukada, Yukimasa*; Yoshii, Kenji; Fujiwara, Kosuke*; Fukuyama, Ryota*; Ikeda, Naoshi*
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no abstracts in English
Fukada, Yukimasa*; Yoshii, Kenji; Fujiwara, Kosuke*; Hayashi, Naoaki*; Fukuda, Tatsuo; Mizumaki, Masaichiro*; Shigematsu, Kei*; Azuma, Masaki*; Takeda, Masayasu; Ikeda, Naoshi*
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Magnetic and dielectric properties were investigated for poly and single crystalline LuFeO, a related oxide to the electronic ferroelectric RFeO (R: rare earths). The magnetization measurements showed a ferrimagnetic transition at T=270 K. In addition, the temperature derivative showed the existence of a multiple magnetic transition. With cooling the sample, a broad transition occurs at 250-270 K, below which a sharp transition is observed. This result likely indicates the presence of multiple magnetic phases, rooted in the geometrical frustration on the triangular lattice. The dielectric measurements showed a possible correlation between magnetic and dielectric properties at about 120 K, at which both magnetization and AC susceptibility showed broad maxima. The other results will be presented at the conference.
Hayakawa, Takehito; Shizuma, Toshiyuki; Miyamoto, Shuji*; Amano, Sho*; Horikawa, Ken*; Hayashi, Yukio; Kawase, Keigo; Kando, Masaki; Kikuzawa, Nobuhiro; Chiba, Satoshi; et al.
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Hayakawa, Takehito; Miyamoto, Shuji*; Hayashi, Yukio; Kawase, Keigo*; Horikawa, Ken*; Chiba, Satoshi; Nakanishi, Kosuke*; Hashimoto, Hisanobu*; Ota, Takeshi*; Kando, Masaki; et al.
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Hayakawa, Takehito; Miyamoto, Shuji*; Hayashi, Yukio; Kawase, Keigo*; Horikawa, Ken*; Chiba, Satoshi; Nakanishi, Kosuke*; Hashimoto, Hisanobu*; Ota, Takeshi*; Kando, Masaki; et al.
no journal, ,
no abstracts in English