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Journal Articles

New antiferromagnetic order with pressure-induced superconductivity in EuFe$$_2$$As$$_2$$

Ikeda, Shugo*; Tsuchiya, Yu*; Zhang, X.-W.*; Kishimoto, Shunji*; Kikegawa, Takumi*; Yoda, Yoshitaka*; Nakamura, Hiroki; Machida, Masahiko; Glasbrenner, J.*; Kobayashi, Hisao*

Physical Review B, 98(10), p.100502_1 - 100502_6, 2018/09

 Percentile:100(Materials Science, Multidisciplinary)

The interplay between magnetism and superconductivity is one of important subjects to investigate the pairing mechanism in novel superconductors. We have found new coexistence between an antiferromagnetic order in the Fe sublattice and superconductivity of the FeAs-based EuFe$$_2$$As$$_2$$ superconductor in the pressure range from 2.4 to 3.0 GPa by $$^{57}$$Fe nuclear forward scattering (NFS) using a single crystal sample. The magnetic state in the Fe sublattice changes to a new antiferromagnetic one with superconductivity from a stripe-type antiferromagnetic one observed in normal conducting state at 2.7 GPa. Below the superconducting transition temperature, the temperature dependence of $$^{57}$$Fe NFS spectra reveals that the new antiferromagnetic order develops with the superconductivity. This non-trivial coupling of two ordered states in EuFe$$_2$$As$$_2$$ under pressure demonstrates a new and intriguing relationship between magnetism and superconductivity in Fe-based superconductors.

Journal Articles

Synthesis, direct formation under high pressure, structure, and electronic properties of LiNbO$$_{3}$$-type oxide PbZnO$$_{3}$$

Mori, Daisuke*; Tanaka, Kie*; Saito, Hiroyuki; Kikegawa, Takumi*; Inaguma, Yoshiyuki*

Inorganic Chemistry, 54(23), p.11405 - 11410, 2015/12

 Times Cited Count:9 Percentile:33.96(Chemistry, Inorganic & Nuclear)

Journal Articles

Compression behaviors of distorted rutile-type hydrous phases, MOOH (M = Ga, In, Cr) and CrOOD

Sano, Asami; Yagi, Takehiko*; Okada, Taku*; Goto, Hirotada*; Kikegawa, Takumi*

Physics and Chemistry of Minerals, 39(5), p.375 - 383, 2012/05

 Times Cited Count:12 Percentile:42.96(Materials Science, Multidisciplinary)

X-ray diffraction measurements of distorted rutile-type oxyhydroxides $$beta$$-GaOOH, InOOH, $$beta$$-CrOOH, and $$beta$$-CrOOD were taken at a maximum pressure of up to 35 GPa under quasi-hydrostatic conditions, at ambient temperature. Anomalies in the evolution of the relative lattice constants and the axial ratios of $$beta$$-GaOOH, InOOH, and $$beta$$-CrOOD suggest anisotropic stiffening along the a- and/or b-axes where the hydrogen bond is formed. The changes were observed at 15 GPa in $$beta$$-GaOOH and InOOH and at 4 GPa in $$beta$$-CrOOD. The pressures were higher in oxyhydroxides that have longer O...O distances of the hydrogen bond at ambient pressure. In contrast, such stiffening behavior was not observed in CrOOH, which has a significant short O...O distance and strong hydrogen bond. The stiffening behaviors observed in the present study can be attributed to the symmetrization of the hydrogen bonds in oxyhydroxides, as was previously found in $$delta$$-AlOOH(D).

Journal Articles

Pressure-induced structural changes in liquid III-V compounds

Hattori, Takanori; Taga, Naohito*; Takasugi, Yukinobu*; Kinoshita, Tomohiro*; Narushima, Takashi*; Tsuji, Kazuhiko*; Kikegawa, Takumi*

Photon Factory Activity Report 2005, Part A, p.42 - 43, 2006/11

no abstracts in English

Journal Articles

${it In situ}$ X-ray diffraction of graphite-diamond transformation using various catalysts under high pressures and high temperatures

Utsumi, Wataru; Okada, Taku; Taniguchi, Takashi*; Funakoshi, Kenichi*; Kikegawa, Takumi*; Hamaya, Nozomu; Shimomura, Osamu

Journal of Physics; Condensed Matter, 16(14), p.S1017 - S1026, 2004/04

 Times Cited Count:11 Percentile:46.64(Physics, Condensed Matter)

The graphite-diamond transformation was investigated using in-situ time-resolved X-ray diffraction experiments with a MgO dissolved aqueous fluid as the diamond forming catalyst under conditions of 6.6-8.8 GPa and 1400-1835$$^{circ}$$C. Experiments were conducted using a 180-ton DIA-type cubic-anvil apparatus installed on the beamline BL14B1 at SPring-8, a third-generation synchrotron radiation facility in Japan. By analyzing the kinetic data using the JMAK rate equation, it was clarified that altering the pressure-temperature conditions drastically changes the nucleation and growth process of diamond.

Journal Articles

High pressure appratus for neutron diffraction experiments

Otaka, Osamu*; Utsumi, Wataru; Kikegawa, Takumi*

Mirai O Hiraku Koatsuryoku Kagaku Gijutsu Semina Shirizu, 27, p.52 - 62, 2003/07

no abstracts in English

Journal Articles

Phase relation and EOS of ZrO$$_{2}$$ and HfO$$_{2}$$ under high-temperature and high-pressure

Otaka, Osamu*; Fukui, Hiroyuki*; Funakoshi, Kenichi*; Utsumi, Wataru; Irifune, Tetsuo*; Kikegawa, Takumi*

High Pressure Research, 22(1), p.221 - 226, 2002/01

 Times Cited Count:21 Percentile:27.2(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Mechanisms and kinetics of the post-spinel transformation in Mg$$_{2}$$SiO$$_{4}$$

Kubo, Tomoaki*; Otani, Eiji*; Kato, Takumi*; Urakawa, Satoru*; Suzuki, Akio*; Kambe, Yuichi*; Funakoshi, Kenichi*; Utsumi, Wataru; Kikegawa, Takumi*; Fujino, Kiyoshi*

Physics of the Earth and Planetary Interiors, 129(1-2), p.153 - 171, 2002/01

 Times Cited Count:45 Percentile:28.91

no abstracts in English

Journal Articles

Phase relations and equations of state of ZrO$$_{2}$$ under high pressure and high perature

Otaka, Osamu*; Fukui, Hiroyuki*; Kunisada, Taichi*; Fujisawa, Tomoyuki*; Funakoshi, Kenichi*; Utsumi, Wataru; Irifune, Tetsuo*; Kuroda, Koji*; Kikegawa, Takumi*

Physical Review B, 63(17), p.174108_1 - 174108_8, 2001/05

 Times Cited Count:76 Percentile:5.45(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Laser heated diamond anvil apparatus at the Photon Factory and SPring-8; Problems and improvements

Yagi, Takehiko*; Kondo, Tadashi*; Watanuki, Tetsu; Shimomura, Osamu; Kikegawa, Takumi*

Review of Scientific Instruments, 72(2), p.1293 - 1297, 2001/02

 Times Cited Count:25 Percentile:20.64(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Crystal structure of NiO under high pressure

Eto, Tetsujiro*; Endo, Shoichi*; Imai, Motoharu*; Katayama, Yoshinori; Kikegawa, Takumi*

Physical Review B, 61(22), p.14984 - 14988, 2000/06

 Times Cited Count:38 Percentile:14.17(Materials Science, Multidisciplinary)

The pressure effect on the lattice constant of NiO with the rhombohedral distorted B1 structure was studied up to 141 GPa by ${em in situ}$ angle-dispersive x-ray diffraction using synchrotron radiation, an imaging plate, and a diamond anvil cell. The lattice constant $$a$$ and $$c$$, expressed in the hexagonal lattice, decrease monotonously with increasing pressure. The axial rage $$c/a$$ decreases monotonously with increasing pressure, indicating the distortion in the rhombohedral [111] direction becomes larger as pressure increases. The signiifcant change of $$c/a$$ above 60 GPa, suggested by a recent theoretical calculation, was not observed.

Journal Articles

Phase relations of Ca(OH)$$_{2}$$ under high-temperature and high-pressure conditions

Fukui, Hiroyuki*; Otaka, Osamu*; Katsura, Tomoo*; Nagai, Takaya*; Funakoshi, Kenichi*; Utsumi, Wataru; Kikegawa, Takumi*

Science and Technology of High Pressure, p.554 - 557, 2000/00

no abstracts in English

Journal Articles

Crystal structure of NiO under high pressure

Eto, Tetsujiro*; Endo, Shoichi*; Imai, Motoharu*; Katayama, Yoshinori; Kikegawa, Takumi*

Science and Technology of High Pressure (Proceedings of AIRAPT-17), p.487 - 490, 2000/00

The pressure effect on the lattice constant of NiO with the rhombohedral distorted B1 structure was studied up to 141 GPa by ${em in situ}$ angle-dispersive x-ray diffraction using synchrotron radiation and an imaging plate, with reference to a recent theoretical calculation within the density-functional formalism with the local-spin density approcximation. The lattice constant $$a$$ and $$c$$, expressed in the hexagonal lattice, decrease monotonously with increasing pressure. The axial rage $$c/a$$ decreases monotonously with increasing pressure, indicating the enhancement of the rhombohedral distortion. The signiifcant change of $$c/a$$ above 60 GPa suggested by the calculation was not observed.

Journal Articles

X ray diffraction measurements in a double-stage multianvil apparatus using ADC anvils

Irifune, Tetsuo*; Kuroda, Koji*; Nishiyama, Norimasa*; Inoue, Toru*; Funamori, Nobumasa*; Uchida, Takeyuki*; Yagi, Takehiko*; Utsumi, Wataru; Miyajima, Nobuyoshi*; Fujino, Kiyoshi*; et al.

Geophysical Monograph 101 (Properties of Earth and Planetary Materials at High Pressure and Temperature), p.1 - 8, 1998/00

no abstracts in English

Journal Articles

Density measurements of liquid under high pressure and high temperature

Katayama, Yoshinori; Tsuji, Kazuhiko*; Shimomura, Osamu; Kikegawa, Takumi*; M.Mezouar*; D.Martinez-Garcia*; J.M.Besson*; D.Haeusermann*; M.Hanfland*

Journal of Synchrotron Radiation, 5(Part3), p.1023 - 1025, 1998/00

no abstracts in English

Journal Articles

In-situ X-ray observation of phase transformation of rhombohedral boron nitride under static high pressure and high temperature

Taniguchi, Takashi*; Sato, Masashi*; Utsumi, Wataru; Kikegawa, Takumi*; Shimomura, Osamu

Diamond and Related Materials, 6(12), p.1806 - 1815, 1997/12

 Times Cited Count:15 Percentile:31.2

no abstracts in English

Journal Articles

Effect of nonhydrostaticity on the pressure induced phase transformation of rhombohedral boron nitride

Taniguchi, Takashi*; Sato, Masashi*; Utsumi, Wataru; Kikegawa, Takumi*; Shimomura, Osamu

Applied Physics Letters, 70(18), p.2392 - 2394, 1997/05

 Times Cited Count:20 Percentile:27.47(Physics, Applied)

no abstracts in English

Journal Articles

Angle-dispersive diffraction measurement system for high-pressure experiments using a multichannel collimator

Yaoita, Kenichi*; Katayama, Yoshinori; Tsuji, Kazuhiko*; Kikegawa, Takumi*; Shimomura, Osamu

Review of Scientific Instruments, 68(5), p.2106 - 2110, 1997/05

 Times Cited Count:29 Percentile:13.44(Instruments & Instrumentation)

An optical device called a multichannel collimator (MCC) was developed to rapidly perform an angle-dispersive diffraction using a multi-anvil press (MAP) with synchrotron radiation. The MCC consists of multiple channels of collimators in a radial alignment. This eliminates diffraction from the materials surrounding the sample so that we can obtain high-quality diffraction from samples in a MAP using an imaging plate. We have installed a MCC system on a MAP named MAX90 at the Photon Factory, National Laboratory for High Energy Physics. Performance of the MCC has been satisfactorily evaluated, and diffraction patterns of liquid sodium and liquid gallium under 4.8 GPahave been succesfully obtained using this system.

Oral presentation

Change in compression in M$$^{3+}$$OOH oxyhydroxide and implication for hydrogen bond symmetrization

Sano, Asami; Yagi, Takehiko*; Okada, Taku*; Goto, Hirotada*; Kagi, Hiroyuki*; Nagai, Takaya*; Kikegawa, Takumi*

no journal, , 

19 (Records 1-19 displayed on this page)
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