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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：24.90(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：6 Percentile：42.01(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：172 Percentile：97.02(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：55.66(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：36.82(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：81.08(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：52.01(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：89.99(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：56.41(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：89.70(Physics, Multidisciplinary)

no abstracts in English

Oral presentation

Magnetic excitations of spin-gap system Na$$_{3}$$Cu$$_{2}$$SbO$$_{6}$$ with distorted honeycomb structure

Miura, Yoko*; Yasui, Yukio*; Moyoshi, Taketo*; Sato, Masatoshi*; Kakurai, Kazuhisa

no journal, , 

Magnetic excitation spectra of Na$$_{3}$$Cu$$_{2}$$SbO$$_{6}$$ with the distorted honeycomb lattice structure have been investigated by means of neutron inelastic scattering. The observed dispersion of the magnetic excitation can be well understood in the framework of singlet-triplet excitation of quasi-one dimensional bond alternating system running in b-axis direction.

Oral presentation

Successive magnetic transitions and ${it H-T}$ phase diagrams of Kagom$'e$ staircase compound Co$$_{3}$$V$$_{2}$$O$$_{8}$$

Yasui, Yukio*; Kobayashi, Yusuke*; Moyoshi, Taketo*; Soda, Minoru*; Sato, Masatoshi*; Igawa, Naoki; Kakurai, Kazuhisa

no journal, , 

no abstracts in English

Oral presentation

New type phase transition of Li$$_{2}$$RuO$$_{3}$$

Miura, Yoko*; Yasui, Yukio*; Sato, Masatoshi*; Igawa, Naoki; Kakurai, Kazuhisa

no journal, , 

no abstracts in English

Oral presentation

Neutron diffraction and $$mu$$SR measurements of spin liquid candidate Ba$$_{3}$$Zn(Ru$$_{1-x}$$Nb$$_{x}$$)$$_{2}$$O$$_{9}$$

Yasui, Yukio*; Sadamatsu, Ryusuke*; Igawa, Naoki; Sari, D. P.*; Watanabe, Isao*; Terasaki, Ichiro*

no journal, , 

Ba$$_{3}$$ZnRu$$_{2}$$O$$_{9}$$ does not show a Curie tail in the temperature dependence of magnetic susceptibility and shows a constant magnetic susceptibility at low temperatures, suggesting the possibility of it being a new type of quantum spin liquid. A ferromagnetic component appears from around 80 K in the magnetic susceptibility of a sample in which part of the Ru$$^{5+}$$ is replaced by nonmagnetic Nb$$^{5+}$$. This peculiar magnetic property is believed to originate from the competition between intra-Ru dimer interactions and inter-dimer interactions. In order to understand the microscopic magnetism of this material system, we carried out powder neutron diffraction and $$mu$$SR experiments on Ba$$_{3}$$Zn(Ru$$_{1-x}$$Nb$$_{x}$$)$$_{2}$$O$$_{9}$$. As a result, the sample with x=0 is considered to be in a state in which antiferromagnetic order and spin liquid coexist.

40 (Records 1-20 displayed on this page)