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Journal Articles

Excited configurations of hydrogen in the BaTiO$$_{3-x}$$H$$_x$$ perovskite lattice associated with hydrogen exchange and transport

Ito, Takashi; Koda, Akihiro*; Shimomura, Koichiro*; Higemoto, Wataru; Matsuzaki, Teiichiro*; Kobayashi, Yoji*; Kageyama, Hiroshi*

Physical Review B, 95(2), p.020301_1 - 020301_5, 2017/01

 Times Cited Count:11 Percentile:48.83(Materials Science, Multidisciplinary)

Journal Articles

Volume-wise destruction of the antiferromagnetic Mott insulating state through quantum tuning

Frandsen, B. A.*; Liu, L.*; Cheung, S. C.*; Guguchia, Z.*; Khasanov, R.*; Morenzoni, E.*; Munsie, T. J. S.*; Hallas, A. M.*; Wilson, M. N.*; Cai, Y.*; et al.

Nature Communications (Internet), 7, p.12519_1 - 12519_8, 2016/08

 Times Cited Count:33 Percentile:77.26(Multidisciplinary Sciences)

Journal Articles

ToF inelastic neutron scattering studies on quantum spin systems (CuCl)La$$B_2$$O$$_7$$ ($$B$$ = Nb, Ta)

Kawamura, Seiko; Nakajima, Kenji; Inamura, Yasuhiro; Tsujimoto, Yoshihiro*; Kitada, Atsushi*; Takeiri, Fumitaka*; Kageyama, Hiroshi*; Ajiro, Yoshitami*; Nishi, Masakazu*; Kakurai, Kazuhisa

Journal of Physics; Conference Series, 320, p.012037_1 - 012037_5, 2011/09

 Times Cited Count:0 Percentile:0.03(Physics, Condensed Matter)

The magnetic ground state of (CuCl)LaNb$$_2$$O$$_7$$ has been suggested to be a spin-singlet state with an excitation gap of $$Delta E sim 2.3$$ meV, while (CuCl)LaTa$$_2$$O$$_7$$ has an antiferromagnetic (AFM) ground state. The systems are suspected to be a frustrated quantum spin system due to the competition between the nearest and next-nearest exchange interactions. We have studied magnetic excitation in these systems by ToF inelastic neutron scattering technique. The measurements were performed on powder samples of (CuCl)LaNb$$_2$$O$$_7$$ and (CuCl)LaTa$$_2$$O$$_7$$ at a disk-chopper-type spectrometer AMATERAS in J-PARC. In both systems, a band-like excitation was observed at $$Delta E sim 2$$ meV. The $$Q$$ dependence of the intensity of magnetic excitation around 2 meV for (CuCl)LaNb$$_2$$O$$_7$$ well reproduces that observed at a triple-axis spectrometer, exhibiting characteristics of spin-singlet dimers. On the other hand, (CuCl)LaTa$$_2$$O$$_7$$ in the AFM state exhibits a different $$Q$$ dependence.

Journal Articles

Magnetic excitations in infinite-layer antiferromagnetic insulator

Tomiyasu, Keisuke*; Kageyama, Hiroshi*; Lee, C.*; Whangbo, M. H.*; Tsujimoto, Yoshihiro*; Yoshimura, Kazuyoshi*; Taylor, J. W.*; Llobet, A.*; Trouw, F.*; Kakurai, Kazuhisa; et al.

Journal of the Physical Society of Japan, 79(3), p.034707_1 - 034707_4, 2010/03

 Times Cited Count:16 Percentile:66.29(Physics, Multidisciplinary)

Journal Articles

Neutron scattering investigation on quantum spin system SrCu$$_{2}$$(BO$$_{3}$$)$$_{2}$$

Kakurai, Kazuhisa; Nukui, Katsuyuki*; Aso, Naofumi*; Nishi, Masakazu*; Kadowaki, Hiroaki*; Kageyama, Hiroshi*; Ueda, Yutaka*; Regnault, L.-P.*; C$'e$pas, O.*

Progress of Theoretical Physics Supplement, (159), p.22 - 32, 2005/10

no abstracts in English

Journal Articles

High energy-resolution inelastic neutron scattering experiments on triplet bound state excitations in SrCu$$_{2}$$(BO$$_{3}$$)$$_{2}$$

Aso, Naofumi*; Kageyama, Hiroshi*; Nukui, Katsuyuki*; Nishi, Masakazu*; Kadowaki, Hiroaki*; Ueda, Yutaka*; Kakurai, Kazuhisa

Journal of the Physical Society of Japan, 74(8), p.2189 - 2192, 2005/08

 Times Cited Count:8 Percentile:48.31(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Dzyaloshinski-Moriya interaction in the 2D spin gas system SrCu$$_{2}$$(BO$$_{3}$$)$$_{2}$$

C$'e$pas, O.*; Kakurai, Kazuhisa; Regnault, L. P.*; Ziman, T.*; Boucher, J. P.*; Aso, Naofumi*; Nishi, Masakazu*; Kageyama, Hiroshi*; Ueda, Yutaka*

Physical Review Letters, 87(16), p.167205_1 - 167205_4, 2001/10

 Times Cited Count:103 Percentile:92.15(Physics, Multidisciplinary)

no abstracts in English

Oral presentation

The Study of Fe 3d state of A(A=Sr,Ca)FeO$$_{2}$$ by X-ray spectroscopy

Mizumaki, Masaichiro*; Taguchi, Munetaka*; Agui, Akane; Kawamura, Naomi*; Tassel, C.*; Tsujimoto, Yoshihiro*; Kageyama, Hiroshi*

no journal, , 

no abstracts in English

Oral presentation

Powder inelastic neutron scattering study of infinite-layer ferrite SrFeO$$_{2}$$

Tomiyasu, Keisuke*; Kageyama, Hiroshi*; Tsujimoto, Yoshihiro*; Yoshimura, Kazuyoshi*; Taylor, J. W.*; Llobet, A.*; Kakurai, Kazuhisa; Yamada, Kazuyoshi*

no journal, , 

no abstracts in English

Oral presentation

Inelastic neutron scattering measurements on powder sample of 2D quantum spin system (CuCl)La$$A_2$$O$$_7$$ ($$A =$$ Nb,Ta)

Kawamura, Seiko; Nakajima, Kenji; Inamura, Yasuhiro; Tsujimoto, Yoshihiro*; Kitada, Atsushi*; Takeiri, Fumitaka*; Kageyama, Hiroshi*; Ajiro, Yoshitami*; Nishi, Masakazu*; Kakurai, Kazuhisa

no journal, , 

no abstracts in English

Oral presentation

Hydrogen state in BaTiO$$_3$$ hydrides probed by $$mu$$SR

Ito, Takashi; Higemoto, Wataru; Koda, Akihiro*; Shimomura, Koichiro*; Nishiyama, Kusuo*; Matsuzaki, Teiichiro*; Tomono, Dai*; Kobayashi, Yoji*; Sakaguchi, Tatsunori*; Kageyama, Hiroshi*

no journal, , 

no abstracts in English

Oral presentation

$$mu$$SR study of BaTiO$$_3$$ hydride

Ito, Takashi; Higemoto, Wataru; Koda, Akihiro*; Shimomura, Koichiro*; Nishiyama, Kusuo*; Matsuzaki, Teiichiro*; Tomono, Dai*; Kobayashi, Yoji*; Sakaguchi, Tatsunori*; Kageyama, Hiroshi*

no journal, , 

no abstracts in English

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