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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：29.09(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：45.75(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：96.97(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：55.56(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：36.75(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：81.04(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：89.94(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：51.91(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：56.35(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：89.66(Physics, Multidisciplinary)

no abstracts in English

Oral presentation

Magnetic structure and dynamics of honeycomb lattice system, Li$$_{3}$$Ni$$_{2}$$${it A}$O$$_{6}$$ (${it A}$=Sb, Bi)

Fukui, Akito*; Yasui, Yukio*; Hoshikawa, Akinori*; Ishigaki, Toru*; Igawa, Naoki

no journal, , 

Magnetic structure has been studied by using neutron diffraction for honeycomb lattice system Li$$_{3}$$Ni$$_{2}$$${it A}$O$$_{6}$$ (${it A}$=Sb, Bi). Super-lattice peak at ${it d}$ = 8.56 ${AA}$ was appeared around ${it T}$$$_{rm N}$$ and increased with decreasing the temperature. Therefore those peaks were magnetic one caused by the antiferromagnetic transition and those magnetic reflections were shown ${it h}$ $$pm$$ $$delta$$ ${it k l}$ which exhibited the addition of the incommensurate index $$delta$$ $$sim$$0.165 toward the ${it a}$-direction. In result, we considered that the interactions competed against each other in this material.

Oral presentation

Magnetic structure of Li$$_{2}$$ZrCuO$$_{4}$$ with quasi-one-dimensional $${it J}_{1}$$ - $${it J}_{2}$$ magnet

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

no journal, , 

The anomalous behavior of the magnetic susceptibility, $$alpha$$ of Li$$_{2}$$ZrCuO$$_{4}$$ was observed at an antiferromagnetic transition temperature $$T_mathrm{N}sim$$ 7 K by the magnetization measurement. Below $$T_mathrm{N}$$, a spin-flop transition was found at around 4T in the magnetic field ${it H}$//${it a}$. The incommensurate magnetic superlattice reflections at ${it h k l}$ $$pm$$ $$delta$$ indices (${it h}$, ${it k}$, and ${it l}$ = even, and $$delta$$ $$sim$$ 0.487) were observed at 3 K by neutron powder diffraction. The value of $$alpha$$ is evaluated to be 6.2 using the theoretical predicted equation for a $${it J}_{1}$$ - $${it J}_{2}$$ classical spin system and is found to be large from critical point $$alpha_mathrm{c}$$ (=0.25). By the combined studies of the magnetization data, the specific heat data, and neutron magnetic structure analysis, we propose the magnetic structure of Li$$_{2}$$ZrCuO$$_{4}$$.

Oral presentation

Magnetic structure of one-dimensional frustrated quantum spin system Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$

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$$_{12}$$ with CuO$$_{2}$$ ribbon chains have been studied by using the neutron powder diffraction. The magnetic reflections were observed below $$T_mathrm{N}$$ = 1.85 K and all of the magnetic reflections overlapped Bragg reflections. Considering that these are 16-Cu$$^{2+}$$ ions in the unit cell, Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ has the collinear-antiferromagnetic structure.

Oral presentation

Magnetic properties of RCrTiO$$_{5}$$ (R=rare earth elements)

Yasui, Yukio*; Miyamoto, Takuma*; Kori, Shunsuke*; Terasaki, Ichiro*; Yoshizawa, Daichi*; Mitsuru, Akaki*; Hagiwara, Masayuki*; Matsukawa, Takeshi*; Yoshida, Yukihiko*; Hoshikawa, Akinori*; et al.

no journal, , 

We have measured the specific heat and magnetization up to 50 T of polycrystalline samples of RCrTiO$$_{5}$$ (R=Pr, Nd, Eu, Sm and Gd) and also carried out powder neutron diffraction experiments of NdCrTiO$$_{5}$$ and Nd$$_{0.5}$$Pr$$_{0.5}$$CrTiO$$_{5}$$. From the analyses of specific heat data and magnetization curves up to 50 T of the systems, we have evaluated the magnetic interactions between the Cr$$^{3+}$$ - Cr$$^{3+}$$ magnetic moments and between the Cr$$^{3+}$$ -R$$^{3+}$$ ones. The temperature dependence of neutron magnetic reflection intensities of NdCrTiO$$_{5}$$ indicate that both the Cr$$^{3+}$$-moments and the Nd$$^{3+}$$-moments simultaneously order at $$T_mathrm{N}$$. Basis of the obtained magnetic behavior, the mechanism of magnetoelectric effect of RCrTiO$$_{5}$$ will be discussed.

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