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using vibrational spectroscopiesSakurai, Yoko; Machida, Akihiko; Aoki, Katsutoshi
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no abstracts in English
Kambe, Shinsaku; Tokunaga, Yo; Sakai, Hironori; Chudo, Hiroyuki; Matsuda, Tatsuma; Yasuoka, Hiroshi; Haga, Yoshinori; Onuki, Yoshichika
no journal, ,
T-dependence and anisotropy of Knight shift and spin-lattice relaxation time T1 of In-NMR have been determined in heavy fermion superconductor CeIrIn. Knight shift and T1 show a strong anisotropy. Knight shift versus static susceptibility plot is non-linear at low temperatures, indicating that the hyperfine coupling depends on temperature. The origin of hyperfine interaction and anisotropy of spin fluctuations will be discussed.
Moribayashi, Kengo
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no abstracts in English
Sakai, Toru; Tonegawa, Takashi*; Okamoto, Kiyomi*
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The S=1/2 distorted diamond chain is investigated by the density matrix renormalization group and the numerical exact diagonalization. We found that an incommensurate long-range order is induced by the external magnetic field above the 1/3 magnetization plateau. We using this result theoretically explain the field induced incommensurate order observed in the azurite.
Igarashi, Takahiro; Nakazawa, Tetsuya; Tsuru, Tomohito; Kaji, Yoshiyuki
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no abstracts in English
Kawana, Daichi; Watanuki, Tetsu; Machida, Akihiko; Aoki, Katsutoshi; Tsai, A. P.*
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AlMatsuda, Tatsuma; Haga, Yoshinori; Aoki, Dai*; Tateiwa, Naoyuki; Homma, Yoshiya*; Ikeda, Shugo*; Shiokawa, Yoshinobu*; Settai, Rikio*; Onuki, Yoshichika
no journal, ,
no abstracts in English
Fukaya, Yuki
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no abstracts in English
Fukuda, Tatsuo; Baron, A. Q. R.*; Shamoto, Shinichi; Uchiyama, Hiroshi*; Ishikado, Motoyuki; Nakamura, Hiroki; Machida, Masahiko; Mizuki, Junichiro; Arai, Masatoshi; Iyo, Akira*; et al.
no journal, ,
Recently discovered iron-arsenide new superconductor has attracted considerable attraction. Within a few months the transition temperature (
) exceeded 50 K in some related compounds, and the possible novel physics as well as higher- are expected. At the early stage, calculations of phonon properties appeared and suggested that the superconductivity in these materials are not phonon mediated. However, the experimental verification is crucial. We carried out inelastic X-ray scattering on some powder as well as single samples, and found pronounced softening of the Fe-As modes compared to LDA-based phonon calculations. However, further investigation on single crystals showed the spectra are found to agree much better with calculations of the magnetic parent material, which has orthorhombic symmetry, than those using a tetragonal structure like the real superconducting compounds.
Yoshimoto, Masahiro
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no abstracts in English
Suzuki, Junichi; Takata, Shinichi; Shinohara, Takenao; Oku, Takayuki; Kira, Hiroshi; Suzuya, Kentaro; Aizawa, Kazuya; Arai, Masatoshi; Otomo, Toshiya*; Sugiyama, Masaaki*
no journal, ,
no abstracts in English
Hashimoto, Shintaro; Ogata, Kazuyuki*; Chiba, Satoshi; Yahiro, Masanobu*
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The incomplete fusion reaction, in which a part of a projectile is absorbed by a target, proceeds through a compound process. There is a long history of the study of the fusion reaction. However, the incomplete fusion process is not sufficiently well understood. The process contributes significantly in the reaction involving weakly bound nuclei, and the understanding of the reaction mechanism is required. Since a weakly bound nucleus, such as deuteron, breaks up easily in the reaction, the model taking into account the breakup process is required for the analysis. We extended the Continuum-Discretized Coupled-Channels (CDCC) method, and applied to the analysis of incomplete fusion reaction. In the present paper, we show calculated results of incomplete fusion cross section in the deuteron induced reaction on 
Li target, and discuss the importance of the process.
Kumada, Takayuki; Noda, Yohei; Hashimoto, Takeji; Koizumi, Satoshi; Ishikawa, Norito; Ohara, Kota
no journal, ,
We tried to determine distribution of radicals produced by radiolysis of polymer materials using techniques of dynamic nuclear polarization and small-angle neutron scattering.
Ikeuchi, Kazuhiko; Yoshida, Masahiro; Jarrige, I.; Ishii, Kenji; Inami, Toshiya; Mizuki, Junichiro; Bizen, Daisuke*; Murakami, Yoichi*; Miyasaka, Shigeki*; Fujioka, Jun*; et al.
no journal, ,
no abstracts in English
Hamamatsu, Kiyotaka
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no abstracts in English
Kira, Hiroshi; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Takata, Shinichi; Arai, Masatoshi
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no abstracts in English
Shinohara, Takenao; Oku, Takayuki; Suzuki, Junichi; Takata, Shinichi; Kira, Hiroshi; Aizawa, Kazuya; Arai, Masatoshi
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no abstracts in English
Masui, Tomomi; Shikinaka, Kazuhiro*; Koizumi, Satoshi; Kakugo, Akira*; Hashimoto, Takeji; Gong, J.*
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Hierarchical structures of F-actin, an anionic polyelectrolyte, and PDMAPAA-Q, a synthetic linear cationic polyelectrolyte (polycation), complexes in KCl salt solutions have been examined over a wide range of length scales from nanometer to micrometer using a combination of ultra-small-angle neutron scattering technique and fluorescence microscopy. We found hierarchical condensation of actin/polycation complex composed of a superbundle of 10 micrometer, protobundle of 100 nanometer, and protofilament (F-actin) of nanometer. These structures are largely influenced by salt concentrations. With increase of salt concentration superbundle structure changes from globular to extended states, simultaneously, the regularity of F-actin inside the protobundle increased and protobundle size increased about ten times larger. Further increase of salt concentration brings the protobundle disassemble to single F-actin.
Katayama, Yoshinori; Yomogida, Yoshiki; Saito, Hiroyuki; Aoki, Katsutoshi
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Hydrogen reacts with many metals and form metal hydrides. In transition metal hydrides, hydrogen atoms usually occupy interstitial sites and the crystalline lattice expands. To study effect of hydrogen to the structure of liquid metals, we have performed high-pressure X-ray diffraction experiments on liquid iron hydride. Measurements on liquid pure iron were also performed for comparison. Measurements were carried out on BL14B1 at SPring-8. LiAlH
was used as a hydrogen source. Structure factor, S(Q), of liquids were obtained from X-ray diffraction data. Structure factors for iron and that for hydride are similar, although the second peak for hydride is more asymmetric. This asymmetry suggests some local orders in hydride. The peak positions are almost the same. Possible causes of the small change in Fe-Fe distance are (1) low concentration of hydrogen in the liquid state, and (2) superabundant vacancy formation reported in the solid state.
irradiated with high energy ions, 3Ohara, Kota; Ishikawa, Norito; Sakai, Seiji; Matsumoto, Yoshihiro; Michikami, Osamu*; Ota, Yasuyuki*; Kimura, Yutaka*
no journal, ,
Irradiation-induced new X-ray diffraction peak is analyzed based on the model that nano-meter size ion tracks are formed in ion-irradiated CeO. X-ray diffraction profile can be interpreted by taking account of overlapping effect.