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Journal Articles

Quantum critical behavior of the hyperkagome magnet Mn$$_3$$CoSi

Yamauchi, Hiroki; Sari, D. P.*; Yasui, Yukio*; Sakakura, Terutoshi*; Kimura, Hiroyuki*; Nakao, Akiko*; Ohara, Takashi; Honda, Takashi*; Kodama, Katsuaki; Igawa, Naoki; et al.

Physical Review Research (Internet), 6(1), p.013144_1 - 013144_9, 2024/02

https://doi.org/10.1103/PhysRevResearch.6.013144

Journal Articles

Ultralow-energy magnon anomaly in yttrium iron garnet

Shamoto, Shinichi; Yasui, Yukio*; Matsuura, Masato*; Akatsu, Mitsuhiro*; Kobayashi, Yoshiaki*; Nemoto, Yuichi*; Ieda, Junichi

Physical Review Research (Internet), 2(3), p.033235_1 - 033235_6, 2020/08

https://doi.org/10.1103/PhysRevResearch.2.033235

Ultralow energy magnon in yttrium iron garnet crystal has been studied by inelastic neutron scattering in an energy range from 10 to 45 $$mu$$eV. When a magnetic field of about 0.1 T is applied along [111], ultralow energy magnon anomaly is found at 10 K.

Journal Articles

High-temperature short-range order in Mn$$_3$$RhSi

Yamauchi, Hiroki; Sari, D. P.*; Watanabe, Isao*; Yasui, Yukio*; Chang, L.-J.*; Kondo, Keietsu; Ito, Takashi; Ishikado, Motoyuki*; Hagihara, Masato*; Frontzek, M. D.*; et al.

Communications Materials (Internet), 1, p.43_1 - 43_6, 2020/07

https://doi.org/10.1038/s43246-020-0042-1

High-temperature short-range order is discovered up to 720 K in Mn$$_3$$RhSi by complementary use of neutron scattering and muon spin relaxation measurements.

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*; Hagihara, Masato*; Soda, Minoru*; Masuda, Takatsugu*; et al.

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

https://doi.org/10.1103/PhysRevB.101.140408
 Times Cited Count：6 Percentile：27.70(Materials Science, Multidisciplinary)

Journal Articles

Neutron diffraction study of 1D quantum spin system Li$$_{2}$$ZrCuO$$_{4}$$ with incommensurate magnetic structure

Yasui, Yukio*; Igawa, Naoki; Kakurai, Kazuhisa

JPS Conference Proceedings (Internet), 8, p.034012_1 - 034012_6, 2015/09

https://doi.org/10.7566/JPSCP.8.034012

Magnetic structure has been studied by using neutron diffraction for quasi one-dimensional quantum spin system Li$$_{2}$$ZrCuO$$_{4}$$ with CuO$$_{2}$$ ribbon chains. The CuO$$_{2}$$ ribbon system Li$$_{2}$$ZrCuO$$_{4}$$ exhibits the antiferromagnetic transition at T$$_{N}$$ $$sim$$ 7 K, however, the magnetic transition is not accompanied with ferroelectricity. At 3K, we observed magnetic superlattice reflections at Q = (0, k, l$$pm$$$$delta$$) and (h, 0, l$$pm$$$$delta$$) (h, k and l = even) with $$delta$$$$sim$$ 0.488 by the powder neutron diffraction. By the combined studies of neutron diffraction and magnetization data, the magnetic structure of Li$$_{2}$$ZrCuO$$_{4}$$ is proposed. On the bases of the obtained data, reasons for absence of ferroelectricity in Li$$_{2}$$ZrCuO$$_{4}$$ are discussed.

Journal Articles

Weak ferromagnetic ordering disordered by Rh$$^{3+}$$ ions for LaCo$$_{0.8}$$Rh$$_{0.2}$$O$$_{3}$$

Asai, Shinichiro*; Okazaki, Ryuji*; Terasaki, Ichiro*; Yasui, Yukio*; Igawa, Naoki; Kakurai, Kazuhisa

JPS Conference Proceedings (Internet), 3, p.014034_1 - 014034_6, 2014/06

https://doi.org/10.7566/JPSCP.3.014034

We have carried out the neutron scattering measurements for a single crystal of LaCo$$_{0.8}$$Rh$$_{0.2}$$O$$_{3}$$ in order to investigate the ferromagnetic ordering induced by Rh$$^{3+}$$ substitution for Co$$^{3+}$$ of LaCoO$$_{3}$$. The ordered moment is evaluated to be 0.4$$pm$$0.2$$mu$$$$_{B}$$, which is consistent with the saturation magnetization of LaCo$$_{0.8}$$Rh$$_{0.2}$$O$$_{3}$$. It indicates that the ferromagnetic ordering of LaCo$$_{0.8}$$Rh$$_{0.2}$$O$$_{3}$$ originates from the short-range ferromagnetic ordering disordered by Rh$$^{3+}$$ ions.

Journal Articles

Spin state of Co$$^{3+} $$ in LaCo$$_{1-x}$$ Rh$$_{x}$$O$$_{3}$$ investigated by structural phenomena

Asai, Shinichiro*; Okazaki, Ryuji*; Terasaki, Ichiro*; Yasui, Yukio*; Kobayashi, Wataru*; Nakao, Akiko*; Kobayashi, Kensuke*; Kumai, Reiji*; Nakao, Hironori*; Murakami, Yoichi*; et al.

Journal of the Physical Society of Japan, 82(11), p.114606_1 - 114606_6, 2013/11

https://doi.org/10.7566/JPSJ.82.114606
 Times Cited Count：7 Percentile：45.44(Physics, Multidisciplinary)

Neutron and synchrotron X-ray diffraction for LaCo$$_{1-x}$$ Rh$$_{x}$$O$$_{3}$$ have been carried out in order to investigate the structural properties related with the spin state of Co$$^{3+}$$ ions. We have found that the values of the Co(Rh)-O bond lengths in the Co(Rh)O$$_{6}$$ octahedron of LaCo$$_{0.8}$$Rh$$_{0.2}$$O$$_{3}$$ are nearly identical at 10 K. The lattice volume for the Rh$$^{3+}$$ substituted samples decreases with the thermal expansion coefficient similar to that of LaCoO$$_{3}$$ from room temperature, and ceases to decrease around 70 K. These experimental results favor a mixed state consisting of the high-spin state and low-spin state Co$$^{3+}$$ ions, and suggest that the high-spin state Co$$^{3+}$$ ions are thermally excited in addition to those pinned by the substituted Rh$$^{3+}$$ ions.

Journal Articles

Higgs transition from a magnetic Coulomb liquid to a ferromagnet in Yb$$_{2}$$Ti$$_{2}$$O$$_{7}$$

Chang, L.-J.*; Onoda, Shigeki*; Su, Y.*; Kao, Y.-J.*; Tsuei, K.-D.*; Yasui, Yukio*; Kakurai, Kazuhisa; Lees, M. R.*

Nature Communications (Internet), 3, p.992_1 - 992_7, 2012/08

https://doi.org/10.1038/ncomms1989
 Times Cited Count：173 Percentile：96.91(Multidisciplinary Sciences)

Journal Articles

Superconducting transition temperature and the thickness of CuO$$_{2}$$ planes of Na$$_{x}$$CoO$$_{2}$$$$cdot$$yH$$_{2}$$O

Moyoshi, Taketo*; Kobayashi, Yoshiaki*; Yasui, Yukio*; Sato, Masatoshi*; Kakurai, Kazuhisa

Solid State Sciences, 12(5), p.656 - 659, 2010/05

https://doi.org/10.1016/j.solidstatesciences.2008.09.016
 Times Cited Count：0 Percentile：0.00(Chemistry, Inorganic & Nuclear)

Journal Articles

Search for magnetic excitation spectra of Na$$_{x}$$CoO$$_{2}$$$$cdot$$$$_{y}$$D$$_{2}$$O; Neutron scattering

Moyoshi, Taketo*; Yasui, Yukio*; Soda, Minoru*; Kobayashi, Yoshiaki*; Sato, Masatoshi*; Kakurai, Kazuhisa

Journal of the Physical Society of Japan, 75(7), p.074705_1 - 074705_6, 2006/07

https://doi.org/10.1143/JPSJ.75.074705
 Times Cited Count：11 Percentile：55.42(Physics, Multidisciplinary)

Neutron scattering investigations on single crystal Na$$_{x}$$CoO$$_{2}$$ y(D$$_{2}$$O) have been carried out. Strong 2-D diffuse scattering due to the short-range ordered state of D$$_{2}$$O molecules are observed. Significant scattering has been also observed for phonons originating from the vibrations of the short-range ordered D$$_{2}$$O molecules. No firm evidence for the magnetic fluctuations has been found for the hydrated superconducting component Na$$_{x}$$CoO$$_{2}$$ y(D$$_{2}$$O), while the very weak intensity modulation observed in the scans along (1/2,1/2,l) suggests the existence of the antiferromagnetic fluctuations in the non-hydrated parts of the sample.

Journal Articles

Evolution of the electronic structure from electron-doped to hole-doped states in the two-dimensional Mott-Hubbard system La$$_{1.17-x}$$Pb$$_{x}$$VS$$_{3.17}$$

Ino, Akihiro*; Okane, Tetsuo; Fujimori, Shinichi; Fujimori, Atsushi; Mizokawa, Takashi*; Yasui, Yukio*; Nishikawa, Takashi*; Sato, Masatoshi*

Physical Review B, 69(19), p.195116_1 - 195116_8, 2004/05

A2004-0402.pdf:0.46MB

https://doi.org/10.1103/PhysRevB.69.195116
 Times Cited Count：7 Percentile：36.57(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Magnetic structures and spin states of NdBaCo$$_{2}$$O$$_{5}$$

Soda, Minoru*; Yasui, Yukio*; Ito, Masafumi*; Iikubo, Satoshi*; Sato, Masatoshi*; Kakurai, Kazuhisa

Journal of the Physical Society of Japan, 73(2), p.464 - 468, 2004/02

https://doi.org/10.1143/JPSJ.73.464
 Times Cited Count：42 Percentile：80.93(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Effects of "stripes" on the magnetic excitation spectra of La$$_{1.48}$$Nd$$_{0.4}$$Sr$$_{0.12}$$CuO$$_{4}$$

Ito, Masafumi*; Yasui, Yukio*; Iikubo, Satoshi*; Soda, Minoru*; Sato, Masatoshi*; Kobayashi, Akito*; Kakurai, Kazuhisa

Journal of the Physical Society of Japan, 72(7), p.1627 - 1630, 2003/07

https://doi.org/10.1143/JPSJ.72.1627
 Times Cited Count：9 Percentile：51.80(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Magnetic structures of high temperature phases of TbBaCo$$_{2}$$O$$_{5.5}$$

Soda, Minoru*; Yasui, Yukio*; Fujita, Toshiaki*; Miyashita, Takeshi*; Sato, Masatoshi*; Kakurai, Kazuhisa

Journal of the Physical Society of Japan, 72(7), p.1729 - 1734, 2003/07

https://doi.org/10.1143/JPSJ.72.1729
 Times Cited Count：76 Percentile：89.87(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Magnetic structure and the hall resistivity of Cu$$_{1-x}$$Zn$$_{x}$$Cr$$_{2}$$Se$$_{4}$$

Iikubo, Satoshi*; Yasui, Yukio*; Oda, Keisuke*; Ono, Yohei*; Kobayashi, Yoshiaki*; Sato, Masatoshi*; Kakurai, Kazuhisa

Journal of the Physical Society of Japan, 71(11), p.2792 - 2799, 2002/11

https://doi.org/10.1143/JPSJ.71.2792
 Times Cited Count：11 Percentile：56.26(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Static correlation and dynamical properties of Tb$$^{3+}$$-moments in Tb$$_{2}$$Ti$$_{2}$$O$$_{7}$$; Neutron scattering study

Yasui, Yukio*; Kanada, Masaki*; Ito, Masafumi*; Harashina, Hiroshi*; Sato, Masatoshi*; Okumura, H.*; Kakurai, Kazuhisa; Kadowaki, Hiroaki*

Journal of the Physical Society of Japan, 71(2), p.599 - 606, 2002/02

https://doi.org/10.1143/JPSJ.71.599
 Times Cited Count：80 Percentile：89.68(Physics, Multidisciplinary)

no abstracts in English

Oral presentation

Magnetic properties and crystal structure of honeycomb lattice system Li$$_{3}$$Ni$$_{2}$$SbO$$_{6}$$

Fukui, Akito*; Yasui, Yukio*; Igawa, Naoki; Matsukawa, Takeshi*; Yoshida, Yukihiko*; Hoshikawa, Akinori*; Ishigaki, Toru*

no journal, , 

The powder neutron crystal structure analysis and measurements of the magnetization and the specific heat have been carried out for the honeycomb lattice spin system Li$$_{3}$$Ni$$_{2}$$SbO$$_{6}$$. From the Rietveld analysis of the neutron diffraction data, we determined the crystal structure of Li$$_{3}$$Ni$$_{2}$$SbO$$_{6}$$, where the space group is ${it C}$ 2/${it m}$ monoclinic and the distortion from ideal honeycomb lattice is $$sim$$0.1 % only. The Weiss temperature $$theta_mathrm{w}$$ obtained from the temperature dependence of magnetic susceptibility is 12.2 K, indicating that dominant interaction between the Ni$$^{2+}$$ spins is ferromagnetic one. However, from the behavior of the magnetic susceptibility and the specific heat, Li$$_{3}$$Ni$$_{2}$$SbO$$_{6}$$ is found to exhibit an antiferromagnetic transition at $$T_mathrm{N}$$ = 13.5 K.

Oral presentation

Magnetic behavior and magnetic structure of CuO$$_{2}$$ ribbon system A$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ (A=Rb, Cs)

Fujimura, Akio*; Yasui, Yukio*; Kono, Yohei*; Kittaka, Shunichiro*; Sakakibara, Toshiro*; Igawa, Naoki; Matsukawa, Takeshi*; Yoshida, Yukihiko*; Hoshikawa, Akinori*; Ishigaki, Toru*

no journal, , 

The magnetic behavior and magnetic structure of A$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ (A=Rb, Cs) with CuO$$_{2}$$ ribbon chains have been studied by using specific heat measurement and neutron diffraction method. Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ showed collinear-antiferromagnetic structure analyzed by the neutron diffraction. The relation between magnetic behavior and magnetic for those materials are discussed.

Oral presentation

Magnetic structure of 1D quantum spin system Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ with $$J_1$$ - $$J_2$$ model

Yasui, Yukio*; Fujimura, Akio*; Omori, Kiyoshi*; Igawa, Naoki; Matsukawa, Takeshi*; Yoshida, Yukihiko*; Hoshikawa, Akinori*; Ishigaki, Toru*

no journal, , 

The magnetic structure of Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ has been studied by using the neutron powder diffraction. Cu$$^{2+}$$ spins collinearly ordinate along the ${it b}$ axis and we found that this material has ferromagnetic structure in ribbon chains and antiferromagnetic structure between ribbon chains. Those results indicate that the magnetic structure is strongly inflected with ferromagnetic $$J_1$$. In this presentation, the detail of magnetic structure of this material will be discussed.

Oral presentation

Crystal and Magnetic Structures of Ba$$_{3}$$Co$$_{1-x}$$Ca$$_{x}$$Ru$$_{2}$$O$$_{9}$$

Horie, Akihiro*; Yasui, Yukio*; Igarashi, Taichi*; Yamamoto, Takafumi*; Misaswa, Kazuki*; Terasaki, Ichiro*; Matsukawa, Takeshi*; Hoshikawa, Akinori*; Ishigaki, Toru*; Igawa, Naoki

no journal, , 

The crystal and magnetic structures of Ba$$_{3}$$Co$$_{1-x}$$Ca$$_{x}$$Ru$$_{2}$$O$$_{9}$$ has been studied by using the neutron powder diffraction. We also carried out the measurements of magnetic properties of this sample. $$T_mathrm{N}$$ is decreased with increasing the fraction of Ca ion, and we found that $$T_mathrm{N}$$ is 76 K at the fraction of Ca = 0.3. although the lattice constants of the sample are increased by the substituting Ca for Co ion, a Ru-Ru bond length decreases with increasing fraction of Ca ion. In this presentation, the details of the magnetic properties and magnetic structure of this material will be discussed.

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