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Journal Articles

Emergent spin-1 Haldane gap and ferroelectricity in a frustrated spin-$$frac{1}{2}$$ ladder

Ueda, Hiroshi*; Onoda, Shigeki*; Yamaguchi, Yasuhiro*; Kimura, Tsuyoshi*; Yoshizawa, Daichi*; Morioka, Toshiaki*; Hagiwara, Masayuki*; Hagiwara, Masato*; Soda, Minoru*; Masuda, Takatsugu*; et al.

Physical Review B, 101(14), p.140408_1 - 140408_6, 2020/04

 Times Cited Count:2 Percentile:44.66(Materials Science, Multidisciplinary)

Journal Articles

Science from the initial operation of HRC

Ito, Shinichi*; Yokoo, Tetsuya*; Masuda, Takatsugu*; Yoshizawa, Hideki*; Soda, Minoru*; Ikeda, Yoichi*; Ibuka, Soshi*; Kawana, Daichi*; Sato, Taku*; Nambu, Yusuke*; et al.

JPS Conference Proceedings (Internet), 8, p.034001_1 - 034001_6, 2015/09

Journal Articles

Neutron scattering studies of the spin-5/2 antiferromagnetic linear trimer substance SrMn$$_3$$P$$_4$$O$$_{14}$$

Hase, Masashi*; D$"o$nni, A.*; Ozawa, Kiyoshi*; Kitazawa, Hideaki*; Sakai, Osamu*; Pomjakushin, V. Y.*; Keller, L.*; Kaneko, Koji; Metoki, Naoto; Kakurai, Kazuhisa; et al.

Journal of Physics; Conference Series, 340, p.012066_1 - 012066_7, 2012/00

 Times Cited Count:1 Percentile:46.98

We determined the magnetic structure below $$T_{rm N1}=2.2(1)$$ K of the spin-5/2 antiferromagnetic (AF) trimer substance SrMn$$_3$$P$$_4$$O$$_{14}$$ using neutron powder diffraction experiments. The incommensurate propagation vector is expressed as [0, $$k_y$$, 0], due to competition between the nearest-neighbor and next-nearest-neighbor interactions in trimerized chains. The value of $$k_y$$ is 0.316 to 0.331, changing rapidly at $$T_{rm N2}= 1.75(5)$$ K. We confirmed that the intra-trimer $$J_1$$ interaction is AF. The magnetic excitation peaks were obsereved at 0.46, 0.68, and 1.02 meV. The weak Q dependence indicates the discrete energy levels, which do not contradict the AF trimer model with the intra-trimer interaction value of 0.29 meV (3.4 K).

Journal Articles

Magnetic excitations in the spin-5/2 antiferromagnetic trimer substance SrMn$$_3$$P$$_4$$O$$_{14}$$

Hase, Masashi*; Matsuda, Masaaki*; Kaneko, Koji; Metoki, Naoto; Kakurai, Kazuhisa; Yang, T.*; Cong, R.*; Lin, J.*; Ozawa, Kiyoshi*; Kitazawa, Hideaki*

Physical Review B, 84(21), p.214402_1 - 214402_6, 2011/12

 Times Cited Count:9 Percentile:42.37(Materials Science, Multidisciplinary)

Journal Articles

Comparison of the mutation inducing effect between ion beams and $$gamma$$-rays; Guineagrass and sorghum

Nakagawa, Hitoshi*; Inafuku, Masashi*; Kusaba, Makoto*; Yamaguchi, Hiroyasu*; Morishita, Toshikazu*; Morita, Ryohei*; Nishimura, Minoru*; Hoeman, S.*; Yokota, Yuichiro; Hase, Yoshihiro; et al.

JAEA-Review 2007-060, JAEA Takasaki Annual Report 2006, P. 72, 2008/03

no abstracts in English

Journal Articles

Inelastic neutron scattering study of the spin-gap cuprate $$beta$$-AgCuPO$$_{4}$$

Hase, Masashi*; Matsuda, Masaaki; Kakurai, Kazuhisa; Ozawa, Kiyoshi*; Kitazawa, Hideaki*; Tsujii, Naohito*; D$"o$nni, A.*; Kuroe, Haruhiko*

Physical Review B, 76(13), p.134403_1 - 34403_5, 2007/10

 Times Cited Count:2 Percentile:13.24(Materials Science, Multidisciplinary)

The magnetism of $$beta$$-AgCuPO$$_{4}$$ has been studied using inelastic neutron scattering and magnetic susceptibility measurements on powder sample. A well-defined symmetric broad inelastic peak was observed at 6.2meV energy transfer, indicating the existence of spin-gap excitation. From the Q-dependence of the inelastic magnetic intensities it is concluded that the strongest exchange interaction exists in the Cu-O-P-O-Cu path and that the antiferromagnetic alternating chain model with two exchange interactions values of 80 and 14K can quantitatively explain the experimental results.

Journal Articles

Direct observation of the energy gap generating the 1/3 magnetization plateau in the spin-1/2 trimer chain compound Cu$$_{3}$$(P$$_{2}$$O$$_{6}$$OD)$$_{2}$$ by inelastic neutron scattering measurements

Hase, Masashi*; Matsuda, Masaaki; Kakurai, Kazuhisa; Ozawa, Kiyoshi*; Kitazawa, Hideaki*; Tsujii, Naohito*; D$"o$nni, A.*; Kono, Masanori*; Hu, X.*

Physical Review B, 76(6), p.064431_1 - 064431_5, 2007/08

 Times Cited Count:23 Percentile:69.29(Materials Science, Multidisciplinary)

The magnetism of spin-1/2 trimer chain system Cu$$_{3}$$(P$$_{2}$$O$$_{6}$$OD)$$_{2}$$ is studied by means of inelastic neutron scattering. A spin excitation gap of 9.8meV corresponding to singlet -triplet excitation is observed and together with the magnetization plateau data the AF exchange interaction parameters of the trimer system could be determined as J$$_{1}$$=111K and J$$_{2}$$=30K.

Oral presentation

Comparison of the mutagenesis effect between ion beams and $$gamma$$ ray; Guinea grass and sorghum

Nakagawa, Hitoshi*; Inafuku, Masashi*; Kusaba, Noboru*; Yamaguchi, Hiroyasu*; Morishita, Toshikazu*; Morita, Ryohei*; Nishimura, Minoru*; Hoeman, S.*; Yokota, Yuichiro; Hase, Yoshihiro; et al.

no journal, , 

no abstracts in English

Oral presentation

Magnetic excitations in spin gap system

Kakurai, Kazuhisa; Matsuda, Masaaki; Hase, Masashi*; Ozawa, Kiyoshi*; Kitazawa, Hideaki*; Tsujii, Naoto*; Doenni, A.*; Hu, X.*; Kuroe, Haruhiko*

no journal, , 

We report powder sample inelastic neutron scattering experiments on spin gap systems. Recently the magnetization plateau phenomenon in quantum spin systems are drawing attention of both theoretical and experimental physicists. Although the relevant exchange energies can be estimated from the magnetic susceptibility measurements assuming some theoretical models, we can only speculate the exchange interaction scheme causing the singlet ground state based on the structural and bonding information. We shall present examples of powder sample inelastic neutron scattering studies on the antiferromagnetic alternating chain system $$beta$$-AgCuPO$$_{4}$$ and trimer chain compound Cu$$_{3}$$(P$$_{2}$$O$$_{6}$$OD)$$_{2}$$ using triple axis spectrometer at the steady state neutron source and stress that this kind of research on novel quantum systems could be very effectively performed using the low-energy chopper type spectrometer being built for the J-PARC spallation neutron source.

Oral presentation

Inelastic neutron scattering study on Cu$$_{3}$$Mo$$_{2}$$O$$_{9}$$

Kuroe, Haruhiko*; Hamasaki, Tomoyuki*; Hase, Masashi*; Kaneko, Koji; Metoki, Naoto; Matsuda, Masaaki; Kakurai, Kazuhisa; Oka, Kunihiko*; Ito, Toshimitsu*; Eisaki, Hiroshi*

no journal, , 

We have measured inelastic neutron scattering in Cu$$_{3}$$Mo$$_{2}$$O$$_{9}$$ to study its magnetic-excitation dispersion curves. This material can be treated as a complex of the following two spin subsystems. (1) Quasi-one-dimensional antiferromagnetic (AF) spin chain with the intrachain interaction pJ4 = 6.3 meV, where p is the renormalization factor depending on the system dimension, together with the ferromagnetic and AF interchain interactions -Ja = J 0.01pJ4. (2) AF spin dimers with the interaction J3 = 5.8 meV. The hybridization parameter, representing the intersubsystem interaction between these subsystems, is estimated as Eint sin (k), where Eint = 1.6 meV. The modulation of the molecular field generated by the spin precession in the excited state of the quasi-one-dimensional spin chain plays an important role in this hybridization.

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