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Search Results: Records 1-7 displayed on this page of 7
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Journal Articles

Softening of magnetic excitations leading to pressure-induced quantum phase transition in gapped spin system KCuCl$$_{3}$$

Goto, Kenji*; Osakabe, Toyotaka; Kakurai, Kazuhisa; Uwatoko, Yoshiya*; Osawa, Akira*; Kawakami, Jun*; Tanaka, Hidekazu*

Journal of the Physical Society of Japan, 76(5), p.053704_1 - 053704_4, 2007/05

https://doi.org/10.1143/JPSJ.76.053704
 Times Cited Count：12 Percentile：57.82(Physics, Multidisciplinary)

The neutron scattering investigation on magnetic excitations in KCuCl$$_{3}$$ under applied pressure was performed. The softening of the excitation mode at a hydrostatic pressure of 4.7kbar was clearly observed. From the analysis of the dispersion relations, it was found that the intradimer interaction decreases under hydrostatic pressure, while most of the interdimer interactions increase.

Journal Articles

Pressure-induced magnetic ordering in KCuCl$$_{3}$$

Kakurai, Kazuhisa; Osakabe, Toyotaka; Goto, Kenji*; Osawa, Akira*; Fujisawa, Masashi*; Tanaka, Hidekazu*

Physica B; Condensed Matter, 385-386(Part 1), p.450 - 452, 2006/11

https://doi.org/10.1016/j.physb.2006.05.237
 Times Cited Count：1 Percentile：6.63(Physics, Condensed Matter)

KCuCl$$_{3}$$ and TlCuCl$$_{3}$$ are singlet ground state systems with excitation gap of 31K and 7.7K, respectively. The origin of the spin gap is the strong antiferromagnetic spin dimer of the chemical Cu$$_{2}$$Cl$$_{6}$$ unit. These spin dimers are weakly coupled three dimensionally via non-frustrating inter dimer exchanges. The magnetization measurements under applied hydrostatic pressure show the existence of the magnetic order above certain critical pressure Pc=8.8 kbar and 0.42 kbar, respectively. We report on the elastic neutron scattering results of the pressure induced magnetic ordering in these quantum systems. The observed magnetic structures and the possible role of the spin-lattice coupling in the spin reorientation in TlCuCl3 under pressure will be discussed.

Journal Articles

Pressure-induced magnetic quantum phase transition in gapped spin system KCuCl$$_{3}$$

Goto, Kenji; Fujisawa, Masashi*; Tanaka, Hidekazu*; Uwatoko, Yoshiya*; Osawa, Akira*; Osakabe, Toyotaka; Kakurai, Kazuhisa

Journal of the Physical Society of Japan, 75(6), p.064703_1 - 064703_7, 2006/06

https://doi.org/10.1143/JPSJ.75.064703
 Times Cited Count：30 Percentile：76.29(Physics, Multidisciplinary)

Magnetization and neutron elastic scattering experiments under hydrostatic pressure were performed on KCuCl$$_{3}$$, which is a three-dimensionally coupled spin dimer system with a gapped ground state. It was found that the intradimer interaction decreases with increasing hydrostatic pressure, while the sum of the interdimer interactions increases. This leads to the shrinkage of the spin gap. A quantum phase transition from a gapped state to an antiferromagnetic state occurs at Pc$$sim$$8.2 kbar. For P$$>$$Pc, magnetic reflections were observed at reciprocal lattice points equivalent to those for the lowest magnetic excitation at zero temperature. This confirms that the spin gap decreases and closes under applied pressure.

JAEA Reports

Working Programme for MIU-4 Borehole Investigations

Ota, Kunio; Nakano, Katsushi; Metcalfe, R.; Ikeda, Koki; ; Amano, Kenji; Takeuchi, Shinji; Hama, Katsuhiro; Matsui, Hiroya

JNC TN7410 99-007, 44 Pages, 1999/08

JNC-TN7410-99-007.pdf:2.59MB

Journal Articles

New composite composed of boron carbide and carbon fiber with high thermal conductivity for first wall

*; Saido, Masahiro; Nakamura, Kazuyuki; Akiba, Masato; ; Goto, Yoshitaka*; *; *; Yamaki, Takahiro*; *; et al.

Journal of Nuclear Materials, 233-237(PT.A), p.781 - 786, 1996/00

https://doi.org/10.1016/S0022-3115(96)00306-6
 Times Cited Count：13 Percentile：72.37(Materials Science, Multidisciplinary)

no abstracts in English

Oral presentation

Magnetization and neutron scattering experiments on TlCuCl$$_{3}$$ and KCuCl$$_{3}$$ under applied pressure

Goto, Kenji*; Fujisawa, Masashi*; Osawa, Akira*; Kakurai, Kazuhisa; Osakabe, Toyotaka; Uwatoko, Yoshiya*; Tanaka, Hidekazu*

no journal, , 

no abstracts in English

Oral presentation

Development of extraction chromatography for Am and Cm recovery, 6; Resin exchange procedure

Goto, Ichiro; Watanabe, So; Koizumi, Kenji; Hirano, Hiroyasu; Sano, Yuichi; Koma, Yoshikazu

no journal, , 

no abstracts in English

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