Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Hiraka, Haruhiro*; Yamaguchi, Yasuo*; Maruyama, Ryuji; Oku, Takayuki; Ino, Takashi*
Hamon, 28(3), p.144 - 149, 2018/08
no abstracts in English
MnGa systemInoue, Kazuko*; Yamaguchi, Yasuo*; Ishii, Yoshinobu; Yamauchi, Hiroki; Shishido, Toetsu*
Materials Science Forum, 539-543, p.3267 - 3272, 2007/00
Magnetic field effect on a Heusler-type NiMnGa off-stoichiometric alloy having a martensitic transformation temperature around room temperature which is coincident with a Curie temperature has been investigated. The precess of martensitic transforation of a single crystal was investigated by neutron diffraction under the magnetic field up to 8 Tesla. It was found that the magnetic field, which is applied at a temperature near the transformation temperature, causes the martensitic transformation. The process of the transformation caused by the increase of magnetic field is quite similar to the process caused by the decrease of temperature.
Fukazawa, Hiroshi; Hoshikawa, Akinori; Yamauchi, Hiroki; Yamaguchi, Yasuo*; Igawa, Naoki; Ishii, Yoshinobu
Physica B; Condensed Matter, 385-386(1), p.113 - 115, 2006/11
Times Cited Count：3 Percentile：17.99(Physics, Condensed Matter)We measured neutron diffraction of powdered samples of ice containing impurities (e.g., potassium deuteroxide, sodium deuteroxide) to analyze the formation of ice XI, a deuterium-ordered phase of ice, from ice Ih, a disordered phase. We found that the diffraction profiles changed with time for several days at 62-70 K, which are below the transition temperature 
= 76 K. From the Rietveld analysis of the diffraction profiles, we determined the change of the structural parameters with the phase transition. The structural analysis provides direct evidence for the existence of deuteron-ordered arrangements in ice containing impurities below . On the basis of the Rietveld analysis, we obtained the mass fraction (
) of ice XI as functions of time and temperature. We report a structural observation for the nucleation and growth of ice XI under various conditions (such as temperature variations and impurity effects), which leads to understand whether or not f reaches unity at an infinite annealing time.
Fukazawa, Hiroshi; Hoshikawa, Akinori; Yamauchi, Hiroki; Yamaguchi, Yasuo*; Ishii, Yoshinobu
Journal of Crystal Growth, 282(1-2), p.251 - 259, 2005/08
Times Cited Count：20 Percentile：82.02(Crystallography)We measured neutron diffraction profiles of powdered KOD-doped D2O ice to investigate the formation and growth of ice XI, a deuterium-ordered phase of ice, from ice Ih, a disordered phase. During the measurements, the ice was annealed at 57 K for about 17 h, and then warmed up and kept at 68 K for about 55 h, which are below the transition temperature Tc = 76 K. The diffraction profiles for the doped ice at 57 K did not change with time and were close to those for ice Ih with the deuterium-disordered arrangement. However, when the temperature increased from 57 K to 68 K, the diffraction profiles changed. We carried out the Rietveld analysis with the parameters for a two-phase model to obtain the structural evidence of the appearance and the growth of ice XI. The analysis provided evidence of ice XI as space group Cmc21 at 68 K. The temporal increase of the mass fraction of ice XI showed that nucleation of ice XI began just after warming up to 68 K. Then ice XI grew for several days in the doped ice. The study provides the first structural observation of the growth of ice XI.
CKaneko, Koji; Metoki, Naoto; Oyama, Kenji*; Onodera, Hideya*; Yamaguchi, Yasuo*
Journal of Magnetism and Magnetic Materials, 272-276(Suppl.), p.e375 - e376, 2004/05
Times Cited Count：0 Percentile：0(Materials Science, Multidisciplinary)no abstracts in English
C; Direct observation with resonant X-ray diffractionTanaka, Yoshikazu*; Inami, Toshiya; Lovesey, S. W.*; Knight, K. S.*; Yakhou, F.*; Mannix, D.*; Kokubun, Jun*; Kanazawa, Masayuki*; Ishida, Kotaro*; Nanao, Susumu*; et al.
Physical Review B, 69(2), p.024417_1 - 024417_11, 2004/01
Times Cited Count：36 Percentile：79.6(Materials Science, Multidisciplinary)Direct evidence of the spatial ordering of Dy 4 quadrupole and hexadecapole moments in DyBC is demonstrated by resonant X-ray diffraction enhanced by an electric quadrupole event (
2 resonance) at the Dy L
absorption edge. The diffraction data show that the structural phase transition at 
= 24.7 K is accompanied by a reduction in the symmetry of the Dy site to 2/
, from 4/, and the spatial ordering of the time-even Dy multipoles with A
character. Below the crystal structure is described by the space group 
4/
and Dy ions occupy sites (4
). The distortion at T involves the lattice occupied by B and C ions, and it amounts to a buckling of B-C planes that are normal to the two-fold rotation axis of 2/. An immediately plausible model of low-energy Dy states correlates data on the specific heat, our X-ray diffraction signals, and magnetic ordering below 15.3 K which has been observed in magnetic neutron diffraction.
COyama, Kenji*; Kaneko, Koji; Onimaru, Takahiro*; Tobo, Aya*; Ishimoto, Kenichi*; Onodera, Hideya*; Yamaguchi, Yasuo*
Journal of the Physical Society of Japan, 72(12), p.3303 - 3304, 2003/12
Times Cited Count：6 Percentile：43(Physics, Multidisciplinary)no abstracts in English
Lu
BC(0
x0.31) compoundsTobo, Aya*; Ishimoto, Kenichi*; Konno, Junya*; Oyama, Kenji*; Kaneko, Koji; Yamaguchi, Yasuo*; Onodera, Hideya*
Journal of the Physical Society of Japan, 72(12), p.3231 - 3236, 2003/12
Times Cited Count：1 Percentile：12.86(Physics, Multidisciplinary)no abstracts in English
Inoue, Kazuko*; Horikawa, Takeshi*; *; *; Minakawa, Nobuaki; Tsuchiya, Yoshinori*; Morii, Yukio; *
Japanese Journal of Applied Physics, Part 1, 37(10), p.5680 - 5686, 1998/10
Times Cited Count：2 Percentile：13.54(Physics, Applied)no abstracts in English
X (X=Ge,Si)S.Purwanto*; *; *; Morii, Yukio; Funahashi, Satoru; *; *
Physica B; Condensed Matter, 213-214, p.318 - 320, 1995/00
Times Cited Count：3 Percentile：25.66(Physics, Condensed Matter)no abstracts in English
Pt*; *; Funahashi, Satoru; *; *; *
Physica B; Condensed Matter, 180-181, p.235 - 237, 1992/00
Times Cited Count：6 Percentile：39.36(Physics, Condensed Matter)no abstracts in English
NiO
*; *; *; *; *; *; *; *; Morii, Yukio; ; et al.
Physica C, 185-189, p.579 - 580, 1991/00
Times Cited Count：16 Percentile：69.11(Physics, Applied)no abstracts in English
MnGa single crystalInoue, Kazuko*; Yamaguchi, Yasuo*; Ishii, Yoshinobu; Yamauchi, Hiroki; Hiraka, Haruhiro*
no journal, ,
no abstracts in English
Metoki, Naoto; Kaneko, Koji; Matsuda, Masaaki; Hiraka, Haruhiro*; Yamaguchi, Yasuo*; Oyama, Kenji*; Yamada, Kazuyoshi*; Matsuura, Masato*; Hirota, Kazuma*; Sato, Taku*
no journal, ,
We present development of TAS in JRR-3.
He filter technique for condensed-matter physics; Development of spin control devicesTsutsumi, Kenji*; Oyama, Kenji*; Hiraka, Haruhiro*; Yamaguchi, Yasuo*; Ino, Takashi*; Oku, Takayuki; Sakaguchi, Yoshifumi; Kira, Hiroshi; Arimoto, Yasushi*; Takeda, Masayasu; et al.
no journal, ,
no abstracts in English
