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Shamoto, Shinichi*; Akatsu, Mitsuhiro*; Matsuura, Masato*; Kawamura, Seiko; Harii, Kazuya*; Ono, Masao*; Chang, L.-J.*; Ito, Takashi; Nemoto, Yuichi*; Ieda, Junichi
Physical Review Research (Internet), 4(1), p.013245_1 - 013245_7, 2022/03
Ultrasound injection effect on a magnetic Bragg peak of yttrium iron garnet has been studied by quasielastic neutron scattering. The magnetic Bragg peak is vastly enhanced with decreasing temperature. The energy width increases proportionally to the square root of the sample temperature increase induced by the ultrasound injection. Because the magnetic Bragg peak is enhanced by the lattice vibration, the enhancement is expected to relate to the spin-lattice coupling closely. An observed sharp drop above 100 K in the longitudinal mode suggests the degradation of the spin-lattice coupling. It is consistent with the decline of spin Seebeck effect with increasing temperature above 100 K, proving the degradation mechanism by the spin-lattice coupling.
Ti
O
Kadowaki, Hiroaki*; Wakita, Mika*; F
k, B.*; Ollivier, J.*; Kawamura, Seiko; Nakajima, Kenji; Takatsu, Hiroshi*; Tamai, Mototake*
Journal of the Physical Society of Japan, 87(6), p.064704_1 - 064704_6, 2018/06
Times Cited Count：9 Percentile：57.38(Physics, Multidisciplinary)The ground states of the frustrated pyrochlore oxide TbTiO have been studied by inelastic neutron scattering experiments. Three single-crystal samples are investigated; one shows no phase transition (
), being a putative quantum spin-liquid (QSL), and the other two (
) show electric quadrupole ordering (QO) below 
K. The QSL sample shows continuum excitation spectra with an energy scale 0.1 meV as well as energy-resolution-limited (nominally) elastic scattering. As 
is increased, pseudospin wave of the QO state emerges from this continuum excitation, which agrees with that of powder samples and consequently verifies good control for the present single crystal samples.
Shamoto, Shinichi; Ito, Takashi; Onishi, Hiroaki; Yamauchi, Hiroki; Inamura, Yasuhiro; Matsuura, Masato*; Akatsu, Mitsuhiro*; Kodama, Katsuaki; Nakao, Akiko*; Moyoshi, Taketo*; et al.
Physical Review B, 97(5), p.054429_1 - 054429_9, 2018/02
Times Cited Count：18 Percentile：65.6(Materials Science, Multidisciplinary)Nuclear and magnetic structure and full magnon dispersions of yttrium iron garnet Y
Fe
O
have been studied by neutron scattering. The lowest-energy dispersion below 14 meV exhibits a quadratic dispersion as expected from ferromagnetic magnons. The imaginary part of 
-integrated dynamical spin susceptibility 
"(
) exhibits a square-root energy-dependence in the low energies. The magnon density of state is estimated from the "() obtained on an absolute scale. The value is consistent with a single chirality mode for the magnon branch expected theoretically.
Akatsu, Eiko;
Anal.Chim.Acta, 62, p.325 - 335, 1972/00
Times Cited Count：7no abstracts in English
Akatsu, Eiko; Ueno, Kaoru; Yokotsuka, Seiichiro*
Journal of Nuclear Science and Technology, 8(11), p.622 - 629, 1971/11
no abstracts in English
Cs and I through Mixed Resin BedAkatsu, Eiko; Ueno, Kaoru
Journal of Nuclear Science and Technology, 8(9), p.477 - 480, 1971/09
no abstracts in English
)
・6HO-AND CaCl・6HO-Tri-n-Butyl Phosphate SystemsAkatsu, Eiko;
Anal.Chim.Acta, 55, p.333 - 340, 1971/00
Times Cited Count：16no abstracts in English
Pu; Akatsu, Eiko
Journal of Nuclear Science and Technology, 6(8), p.480 - 482, 1969/08
no abstracts in English
Fe
OShamoto, Shinichi; Matsuura, Masato*; Akatsu, Mitsuhiro*; Ito, Takashi; Mori, Michiyasu; Kajimoto, Ryoichi; Kawamura, Seiko; Shibata, Kaoru; Nemoto, Yuichi*; Maekawa, Sadamichi
no journal, ,
no abstracts in English
Shamoto, Shinichi; Ito, Takashi; Mori, Michiyasu; Maekawa, Sadamichi; Kajimoto, Ryoichi; Inamura, Yasuhiro; Nakamura, Mitsutaka; Kawamura, Seiko; Shibata, Kaoru; Matsuura, Masato*; et al.
no journal, ,
no abstracts in English
FeO and the thermal flow & ultrasound effectShamoto, Shinichi; Matsuura, Masato*; Akatsu, Mitsuhiro*; Ito, Takashi; Mori, Michiyasu; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Kawamura, Seiko; Shibata, Kaoru; Nemoto, Yuichi*; et al.
no journal, ,
no abstracts in English
Shamoto, Shinichi; Matsuura, Masato*; Akatsu, Mitsuhiro*; Ito, Takashi; Kajimoto, Ryoichi; Mori, Michiyasu; Onishi, Hiroaki; Nakamura, Mitsutaka; Kawamura, Seiko; Shibata, Kaoru; et al.
no journal, ,
We have studied the magnon density of state in yttrium iron garnet ranging from 0.02 meV to 20 meV by using spectrometers, DNA, AMATERAS, and 4SEASONS, at J-PARC/MLF. The E-dependence is well reproduced by a simple square-root function in this energy range.
FeOShamoto, Shinichi; Ito, Takashi; Onishi, Hiroaki; Mori, Michiyasu; Matsuura, Masato*; Akatsu, Mitsuhiro*; Nakamura, Mitsutaka; Inamura, Yasuhiro; Yamauchi, Hiroki; Nakao, Akiko*; et al.
no journal, ,
no abstracts in English
FeOShamoto, Shinichi; Ito, Takashi; Onishi, Hiroaki; Matsuura, Masato*; Akatsu, Mitsuhiro*; Nakamura, Mitsutaka; Inamura, Yasuhiro; Kodama, Katsuaki; Kawamura, Seiko; Nemoto, Yuichi*; et al.
no journal, ,
no abstracts in English
