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Journal Articles

Quantum critical behavior of the hyperkagome magnet MnCoSi

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

Spontaneous topological Hall effect induced by non-coplanar antiferromagnetic order in intercalated van der Waals materials

Takagi, Hirotaka*; Takagi, Rina*; Minami, Susumu*; Nomoto, Takuya*; Oishi, Kazuki*; Suzuki, Michito*; Yanagi, Yuki*; Hirayama, Motoaki*; Khanh, N.*; Karube, Kosuke*; et al.

Nature Physics, 19(7), p.961 - 968, 2023/07

https://doi.org/10.1038/s41567-023-02017-3

Times Cited Count：8 Percentile：96.03(Physics, Multidisciplinary)

Journal Articles

Devil's staircase transition of the electronic structures in CeSb

Kuroda, Kenta*; Arai, Yosuke*; Rezaei, N.*; Kunisada, So*; Sakuragi, Shunsuke*; Alaei, M.*; Kinoshita, Yuto*; Bareille, C.*; Noguchi, Ryo*; Nakayama, Mitsuhiro*; et al.

Nature Communications (Internet), 11, p.2888_1 - 2888_9, 2020/06

https://doi.org/10.1038/s41467-020-16707-6

Times Cited Count：20 Percentile：75.49(Multidisciplinary Sciences)

Journal Articles

Quasi-one-dimensional magnetic interactions and conduction electrons in EuCu and EuAu with the characteristic hexagonal structure

Matsuda, Shinya*; Ota, Joji*; Nakaima, Kenri*; Iha, Wataru*; Gochi, Jun*; Uwatoko, Yoshiya*; Nakashima, Miho*; Amako, Yasushi*; Honda, Fuminori*; Aoki, Dai*; et al.

Philosophical Magazine, 100(10), p.1244 - 1257, 2020/04

https://doi.org/10.1080/14786435.2019.1708498

Times Cited Count：3 Percentile：19.68(Materials Science, Multidisciplinary)

Journal Articles

Magnetic structure and quadrupolar order parameter driven by geometrical frustration effect in NdB

Yamauchi, Hiroki; Metoki, Naoto; Watanuki, Ryuta*; Suzuki, Kazuya*; Fukazawa, Hiroshi; Chi, S.*; Fernandez-Baca, J. A.*

Journal of the Physical Society of Japan, 86(4), p.044705_1 - 044705_9, 2017/04

https://doi.org/10.7566/JPSJ.86.044705

Times Cited Count：13 Percentile：64.28(Physics, Multidisciplinary)

Neutron diffraction experiments have been carried out to characterize the magnetic structures and order parameters in an intermediate phase of NdB showing the successive phase transitions at $T_{rm 0} = 17.2$ K, $T_{rm N1} = 7.0$ K, and $T_{rm N2} = 4.8$ K. The observed patterns in phase II ( $T_{rm N1} < T < T_{rm 0}$ ) are successfully explained by postulating a planar structure with static magnetic moments in the tetragonal -plane. We have found that the magnetic structure in phase II can be uniquely determined to be a linear combination of noncolinear "all-in/all-out"-type and "vortex"-type antiferromagnetic structures. We propose that the quadrupolar interaction holds the key to stabilizing the noncollinear magnetic structure and quadrupolar order. Here, the frustration in the Shastry - Sutherland lattice would play an essential role in suppressing the dominance of the magnetic interaction.

Journal Articles

Neutron powder diffraction study on the magnetic structure of NdPdAl

Metoki, Naoto; Yamauchi, Hiroki; Kitazawa, Hideaki*; Suzuki, Hiroyuki*; Hagihara, Masato*; Frontzek, M. D.*; Matsuda, Masaaki*; Fernandez-Baca, J. A.*

Journal of the Physical Society of Japan, 86(3), p.034710_1 - 034710_5, 2017/03

https://doi.org/10.7566/JPSJ.86.034710

Times Cited Count：9 Percentile：56.98(Physics, Multidisciplinary)

Magnetic structure of NdPdAl has been studied by means of neutron powder diffraction. We observed remarkable magnetic reflections with the modulation vector = (1/2 0 0) below the ordering temperature $T_{rm N}$ = 1.2 K. We found a collinear magnetic structure of Nd moment of 2.9(1) ${mu}_{rm B}$ at 0.3 K parallel to the -axis, where the ferromagnetically ordered planes stack with four Nd layer period of ++-- sequence along the direction with the distance between adjuscent Nd layers to be . This is very similar to CePdAl with = (0.23 0.23 0) and the Ce moment parallel to the -axis. These structures with in-plane modulation $q_{|}$ is a consequence of the two dimensional nature of fermi surface topology in this family, coming from unique crystal structure with very long tetragonal unit cell and large distance 7 between the rare earth layers separated by Al and two Pd layers.

Journal Articles

A-Type antiferromagnetic ordering and the transition of the 5 electronic state accompanied by unusual moment reorientation in NpRhGa

Jonen, Shintaro; Metoki, Naoto; Honda, Fuminori; Kaneko, Koji; Yamamoto, Etsuji; Haga, Yoshinori; Aoki, Dai*; Homma, Yoshiya*; Shiokawa, Yoshinobu; Onuki, Yoshichika

Journal of the Physical Society of Japan, 75(Suppl.), p.41 - 43, 2006/08

Elastic neutron scattering experiments have been carried out in order to reveal the magnetic structure and 5f electronic state of NpRhGa. This material exhibits two successive antiferromagnetic transition at T $_{N1}$ = 36 K and T $_{N2}$ = 33 K, respectively. A-type antiferromagnetic structure with the propagation vector q = (0 0 1/2) has been revealed below T $_{N1}$ . We found a remarkable change in the moment direction, namely the Np moment is parallel and perpendicular to the c-axis for T $_{N2}$ T T $_{N1}$ and T T $_{N2}$ , respectively. The magnetic moment exhibits a remarkable jump at T $_{N2}$ , indicating that the moment reorientation is associated with the change of 5f electronic state. The observed magnetic form factor indicates the dominant contribution of the orbital moment and revealed an itinerant character of the 5f electrons.

Journal Articles

Magnetic structure and successive phase transition in NpRhGa $_{5}$

Jonen, Shintaro; Metoki, Naoto; Honda, Fuminori; Kaneko, Koji; Aoki, Dai*; Homma, Yoshiya*; Yamamoto, Etsuji; Haga, Yoshinori; Shiokawa, Yoshinobu; Onuki, Yoshichika

Physica B; Condensed Matter, 378-380, p.1018 - 1020, 2006/05

https://doi.org/10.1016/j.physb.2006.01.503

Times Cited Count：7 Percentile：35.12(Physics, Condensed Matter)

The magnetic structure of NpRhGa has been investigated by neutron scattering. NpRhGa exhibits two antiferromagnetic phases with transition temperatures at T $_{N1}$ = 36 K and T $_{N2}$ = 33 K. Neutron scattering experiments revealed an antiferromagnetic structure with propagation vector q = (0 0 1/2) for both, where the Np magnetic moments are oriented parallel to the c-axis for T $_{N2}$ T T $_{N1}$ and parallel to the [110] direction on basal plane for T T $_{N2}$ . At T $_{N2}$ the reorientation of magnetic moments is accompanied by a sudden increase of magnetic moments, indicative of the first order transition. The magnetic form factor revealed a dominant contribution of the orbital moments.

Journal Articles

Neutron scattering study on 5f itinerant antiferromagnet UPdGa

Ikeda, Shugo; Metoki, Naoto; Haga, Yoshinori; Kaneko, Koji; Matsuda, Tatsuma; Onuki, Yoshichika

Physica B; Condensed Matter, 359-361, p.1030 - 1032, 2005/06

https://doi.org/10.1016/j.physb.2005.01.387

Times Cited Count：1 Percentile：6.23(Physics, Condensed Matter)

We have succeeded to grow a single crystal of uranium ternary intermetallic compound UPdGa by the Ga self-flux method. The magnetic susceptibility showed a weak temperature dependence and small anisotropy,consistent with an itinerant character of 5 electrons. We observed a clear drop in the susceptibility and electrical resistivity below the Neel temperature = 31 K. The magnetic structure was studied by means of a neutron diffraction measurement. We observed an antiferromagnetic peak with the propagation vector =[0,0,1/2]. The uranium 5 moment of 0.33 $_{B}$ parallel to the -axis was found to order ferromagnetically in the basal -plane and coupled antiferromagnetically along the -axis.

Journal Articles

Magnetic structure of spin-density waves in Cr(001)/Sn multilayers with periodic monatomic spacer layers of nonmagnetic Sn

Takeda, Masayasu; Mibu, Ko*; Shinjo, Teruya*; Endo, Yasuo*; Suzuki, Junichi

Physical Review B, 70(10), p.104408_1 - 104408_9, 2004/09

https://doi.org/10.1103/PhysRevB.70.104408

Times Cited Count：8 Percentile：41.01(Materials Science, Multidisciplinary)

Detailed magnetic structure of spin-density waves (SDWs) in epitaxial Cr(001)/Sn multilayer was investigated by neutron scattering combined with Mssbauer spectroscopic studies. Monatomic Sn layers were embedded in 240 nm thick Cr(001) films with varying the periodic spacing from 4.2 to 16.2 nm. All samples were revealed to be a commensurate antiferromagnetic (CAF) phase at 300 K. The CAF structures changed to incommensurate SDW states with complex waveforms whose wavelength are controlled by the artificial periodicity at low temperatures although the CAF structure in the sample with the period of 4.2 nm persisted even at 10 K. The phase transition depends on the thickness of the Cr layers intervening between Sn monatomic layers. An appreciable phase slip in the SDW was observed during the phase transition in the sample with the period of 10.2 nm. The SDW structure is discussed by taking account of the competing forces between the nesting of Fermi surface and a pinning of antinodes at the Sn monatomic layers.

Journal Articles

Long periodic magnetic structure in CeBC

Oyama, Kenji*; Kaneko, Koji; Onimaru, Takahiro*; Tobo, Aya*; Ishimoto, Kenichi*; Onodera, Hideya*; Yamaguchi, Yasuo*

Journal of the Physical Society of Japan, 72(12), p.3303 - 3304, 2003/12

https://doi.org/10.1143/JPSJ.72.3303

Times Cited Count：6 Percentile：43(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Single crystal growth and magnetic properties of 5-itinerant antiferromagnet UPdGa

Ikeda, Shugo; Metoki, Naoto; Haga, Yoshinori; Kaneko, Koji; Matsuda, Tatsuma; Onuki, Yoshichika; Galatanu, A.

Journal of the Physical Society of Japan, 72(10), p.2622 - 2626, 2003/10

https://doi.org/10.1143/JPSJ.72.2622

Times Cited Count：16 Percentile：65.65(Physics, Multidisciplinary)

A single crystal of uranium ternary intermetallic compound UPdGa was grown by the Ga self-flux method. The magnetic susceptibility showed a weak temperature dependence and small anisotropy, consistent with an itinerant character of 5 electrons. We observed a clear drop in the susceptibility and electrical resistivity below the Nel temperature $T_{rm N}$ = 31 K. The magnetic structure was studied by means of a neutron diffraction measurement. We observed an antiferromagnetic peak with the propagation vector =[0,0,1/2]. The uranium 5 moment of 0.33 $mu_{rm B}$ /U parallel to the -axis was found to order ferromagnetically in the basal -plan and coupled antiferromagnetically along the -axis.

Journal Articles

Current point formation and magnetic reconnection process in nonlinearly destabilized double tearing modes

Ishii, Yasutomo; Azumi, Masafumi; Kishimoto, Yasuaki

Physics of Plasmas, 10(9), p.3512 - 3520, 2003/09

https://doi.org/10.1063/1.1594187

Times Cited Count：12 Percentile：37.11(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Addendum to $lqlq Doping-Dependent Magnetic Structure of Tb$_{1-x}$$ Ca $_{x}$ MnO $_{3}$ rqrq

Machida, Akihiko; Moritomo, Yutaka*; Oyama, Kenji*

Journal of the Physical Society of Japan, 72(5), P. 1312, 2003/05

In order to investigate interrelation between the lattice structure and the magnetic structure, we have performed Rietveld structural analysis on the neutron powder patterns for Tb $_{1-x}$ Ca $_{x}$ MnO at low temperature. In the concentration range of , we observed the Bragg reflections due to the CE-like- and C-type structures. In this range, the powder patterns were reproduce by the two-phase model with and $P2_{1}/m$ symmetries. The fractions of these phases change against concentration . This variation of the fraction for the phase is similar to the variation of the integrated intensities of the CE-like-type magnetic Bragg reflections. This indicates that the phase is responsible for the CE-like spin-ordering. Furthermore, we discussed interrelation between the detailed lattice structure and magnetic structure.