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Journal Articles

Three-dimensional spin susceptibility in $${mathrm{Ba}}_{0.75}{mathrm{K}}_{0.25}{mathrm{Fe}}_{2}{mathrm{As}}_{2}$$; Out-of-plane modulation revealed by neutron spectroscopy and theoretical modeling

Murai, Naoki; Suzuki, Katsuhiro*; Nakajima, Masamichi*; Kofu, Maiko*; Kawamura, Seiko; Inamura, Yasuhiro; Kajimoto, Ryoichi

Physical Review B, 113(13), p.134430_1 - 134430_12, 2026/04

https://doi.org/10.1103/w1lf-837b
 Times Cited Count：0 Percentile：0.00(Materials Science, Multidisciplinary)

We investigated the three-dimensional nature of spin fluctuations in the iron-based superconductor $${mathrm{Ba}}_{0.75}{mathrm{K}}_{0.25}{mathrm{Fe}}_{2}{mathrm{As}}_{2}$$ by combining time-of-flight inelastic neutron scattering with DFT-based theoretical modeling. The neutron measurements revealed a clear out-of-plane modulation of the low-energy magnetic intensity, with maxima at odd $$L$$ positions, indicating robust antiferromagnetic correlations along the $$c$$ axis. With increasing energy, this modulation gradually disappears, signaling a crossover from three-dimensional to nearly two-dimensional spin dynamics. Calculations based on a realistic three-dimensional electronic structure reproduce both the low-energy $$L$$ modulation and its energy-dependent suppression. Our itinerant approach, built on a material-specific DFT-derived band structure, captures this three-dimensional-to-two-dimensional crossover without phenomenological tuning, thereby providing a stringent benchmark for realistic electronic-structure models of iron-based superconductors.

Journal Articles

Coupled dimerized alternating-bond quantum spin chains in the distorted honeycomb-lattice magnet Cu$$_{5}$$SbO$$_{6}$$

Piyakulworawat, C.*; Morita, Katsuhiro*; Fukumoto, Yoshiyuki*; Hsieh, W.-Y.*; Chen, W.-T.*; Nakajima, Kenji; Kawamura, Seiko; Zhao, Y.*; Wannapaiboon, S.*; Piyawongwatthana, P.; et al.

Physical Review Research (Internet), 8(1), p.013247_1 - 013247_16, 2026/03

https://doi.org/10.1103/vdgg-d128

We analyze powder-averaged inelastic neutron scattering and magnetization data for the distorted honeycomb compound Cu$$_{5}$$SbO$$_{6}$$ using a first-order dimer expansion calculation and quantum Monte Carlo simulations. We show that, in contrast to the previously proposed honeycomb lattice model, Cu$$_{5}$$SbO$$_{6}$$ accommodates interacting dimerized spin chains with alternating ferromagnetic-antiferromagnetic couplings along the chain. Moreover, unlike the typical couplings observed in other Cu$$^{2+}$$-based distorted honeycomb magnets, the spin chains in Cu$$_{5}$$SbO$$_{6}$$ primarily couple through an antiferromagnetic coupling that arises between the honeycomb layers, rather than the expected interchain coupling in the layers. This finding reveals a different magnetic coupling scheme for Cu$$_{5}$$SbO$$_{6}$$. In addition, utilizing X-ray spectroscopy and transmission electron microscopy, we also refine the crystal structure and stacking-fault model of the compound.

Journal Articles

Spin excitation continuum from degenerate states in the mixed ferro-antiferromagnetic exchange system CeMgAl$$_{11}$$O$$_{19}$$

Gao, B.*; Chen, T.*; Liu, C.*; Klemm, M. L.*; Zhang, S.*; Ma, Z.*; Xu, X.*; Won, C.*; McCandless, G. T.*; Rao, K.*; et al.

Science Advances (Internet), 12(10), p.eaed7778_1 - eaed7778_7, 2026/03

https://doi.org/10.1126/sciadv.aed7778
 Times Cited Count：2 Percentile：76.89(Multidisciplinary Sciences)

Journal Articles

Wannier states and spin supersolid physics in the triangular antiferromagnet K$$_{2}$$Co(SeO$$_{3}$$)$$_{2}$$

Zhu, M.*; Chinellato, L. M.*; Romerio, V.*; Murai, Naoki; Kawamura, Seiko; Balz, C.*; Yan, Z.*; Gvasaliya, S.*; Kato, Yasuyuki*; Batista, C. D.*; et al.

npj Quantum Materials (Internet), 10, p.74_1 - 74_14, 2025/07

https://doi.org/10.1038/s41535-025-00791-2
 Times Cited Count：15 Percentile：94.09(Materials Science, Multidisciplinary)

Journal Articles

Magnetic and quadrupole coupling emerging in NdB$$_4$$ with geometrically frustrated orthogonal antiferromagnetic dimer

Metoki, Naoto; Yamauchi, Hiroki; Hagihara, Masato; Watanuki, Ryuta*; Kawamura, Seiko; Kofu, Maiko*; Nakajima, Kenji; Matsuda, Masaaki*

Physical Review B, 111(10), p.104424_1 - 104424_9, 2025/03

https://doi.org/10.1103/PhysRevB.111.104424
 Times Cited Count：2 Percentile：44.75(Materials Science, Multidisciplinary)

Inelastic neutron scattering experiments were carried out to understand the unusual successive order in NdB$$_4$$ with the frustrated Shatry-Sutherland (SS) lattice. The pseudo-quartet with $$|pm frac{5}{2}rangle$$ and $$|pm frac{7}{2}rangle$$ splits into four levels in the magnetically ordered states. The spectra can be explained with the on-site magnetic interaction $$langle J_x rangle J_x$$, the coupling of $$J_x$$ with quadrupole $$O_{zx}$$, and the uniaxial crystalline electric field. The $$f$$-electron states reproduce the temperature dependences of the in-plane moment $$m_perp=langle J_x rangle$$ which is the primary order parameter, and a weakly induced $$m_c=langle J_z rangle$$ as the secondary order parameter. The magnetic-quadrupole coupling emerges and play essential role under the geometrical frustration, where the Heisenberg interactions are cancelled out.

Journal Articles

Magnetic excitations in the noncentrosymmetric magnet Sr$$_{2}$$MnSi$$_{2}$$O$$_{7}$$

Kawamata, Masahiro*; Pang, X.*; Murakawa, Hiroshi*; Kawamura, Seiko; Nakajima, Kenji; Masuda, Hidetoshi*; Fujita, Masaki*; Hanasaki, Noriaki*; Onose, Yoshinori*; Nambu, Yusuke*

Physical Review Materials (Internet), 9(1), p.014407_1 - 014407_6, 2025/01

https://doi.org/10.1103/PhysRevMaterials.9.014407
 Times Cited Count：2 Percentile：20.13(Materials Science, Multidisciplinary)

Journal Articles

Continuum excitations in a spin supersolid on a triangular lattice

Zhu, M.*; Romerio, V.*; Steiger, N.*; Nabi, S. D.*; Murai, Naoki; Kawamura, Seiko; Povarov, K. Y.*; Skourski, Y.*; Sibille, R.*; Keller, L.*; et al.

Physical Review Letters, 133(18), p.186704_1 - 186704_6, 2024/11

https://doi.org/10.1103/PhysRevLett.133.186704
 Times Cited Count：34 Percentile：96.31(Physics, Multidisciplinary)

Journal Articles

Neutron flux and energy resolution of direct-geometry disk-chopper spectrometer AMATERAS at J-PARC

Nirei, Masami; Kofu, Maiko; Nakajima, Kenji; Kikuchi, Tatsuya*; Kawamura, Seiko; Murai, Naoki; Harada, Masahide; Inamura, Yasuhiro

Journal of Neutron Research, 26(2-3), p.75 - 82, 2024/09

https://doi.org/10.3233/JNR-230013

Journal Articles

Signatures of Kitaev interactions in the van der Waals ferromagnet VI$$_{3}$$

Gu, Y. Q.*; Gu, Y. M.*; Liu, F.*; Kawamura, Seiko; Murai, Naoki; Zhao, J.*

Physical Review Letters, 132(24), p.246702_1 - 246702_7, 2024/06

https://doi.org/10.1103/PhysRevLett.132.246702
 Times Cited Count：15 Percentile：88.47(Physics, Multidisciplinary)

Journal Articles

Excitation spectrum and spin Hamiltonian of the frustrated quantum Ising magnet Pr$$_{3}$$BWO$$_{9}$$

Nagl, J.*; Flavi$'a$n, D.*; Hayashida, S.*; Povarov, K. Y.*; Yan, M.*; Murai, Naoki; Kawamura, Seiko; Simutis, F.*; Hicken, T. J.*; Luetkens, H.*; et al.

Physical Review Research (Internet), 6(2), p.023267_1 - 023267_18, 2024/06

https://doi.org/10.1103/PhysRevResearch.6.023267

Journal Articles

Recent status of the cryogenic sample environment at the MLF, J-PARC

Ishikado, Motoyuki*; Takahashi, Ryuta*; Yamauchi, Yasuhiro*; Nakamura, Masatoshi*; Ishimaru, Sora*; Yamauchi, Sara*; Kawamura, Seiko; Kira, Hiroshi*; Sakaguchi, Yoshifumi*; Watanabe, Masao; et al.

JPS Conference Proceedings (Internet), 41, p.011010_1 - 011010_7, 2024/05

https://doi.org/10.7566/JPSCP.41.011010

Journal Articles

Antiferromagnetic ordering and chiral crystal structure transformation in Nd$$_3$$Rh$$_4$$Sn$$_{13}$$

Shimoda, Ami*; Iwasa, Kazuaki*; Kuwahara, Keitaro*; Sagayama, Hajime*; Nakao, Hironori*; Ishikado, Motoyuki*; Nakao, Akiko*; Kawamura, Seiko; Murai, Naoki; Ohara, Takashi; et al.

Physical Review B, 109(13), p.134425_1 - 134425_10, 2024/04

https://doi.org/10.1103/PhysRevB.109.134425
 Times Cited Count：5 Percentile：47.53(Materials Science, Multidisciplinary)

Journal Articles

Application of control software framework to sample environment equipment in J-PARC MLF

Hasemi, Hiroyuki; Takahashi, Ryuta*; Yamauchi, Yasuhiro*; Ishikado, Motoyuki*; Kawamura, Seiko; Komine, Ryota

JPS Conference Proceedings (Internet), 41, p.011003_1 - 011003_5, 2024/03

https://doi.org/10.7566/JPSCP.41.011003

Journal Articles

Role of exchange cations and layer charge on the dynamics of confined water

Li, H.*; Zheng, Y.-H.*; Gates, W. P.*; Villacorta, F. J.*; Kawamura, Seiko; Kawakita, Yukinobu; Ikeda, Kazutaka*; Bordallo, H. N.*

Journal of Physical Chemistry A, 128(1), p.261 - 270, 2024/01

https://doi.org/10.1021/acs.jpca.3c05649
 Times Cited Count：3 Percentile：22.01(Chemistry, Physical)

Journal Articles

Magnetic boson peak in classical spin glasses

Kofu, Maiko; Kawamura, Seiko; Murai, Naoki; Ishii, Rieko*; Hirai, Daigoro*; Arima, Hiroshi*; Funakoshi, Kenichi*

Physical Review Research (Internet), 6(1), p.013006_1 - 013006_9, 2024/01

https://doi.org/10.1103/PhysRevResearch.6.013006

Journal Articles

Overall picture and details of diffusion dynamics for liquid benzene by quasielastic neutron scattering and mode distribution analysis

Kikuchi, Tatsuya*; Kawakita, Yukinobu; Nakajima, Kenji; Kawamura, Seiko; Inamura, Yasuhiro

Journal of Molecular Liquids, 385, p.121868_1 - 121868_10, 2023/09

https://doi.org/10.1016/j.molliq.2023.121868
 Times Cited Count：5 Percentile：39.39(Chemistry, Physical)

Journal Articles

A One-third magnetization plateau phase as evidence for the Kitaev interaction in a honeycomb-lattice antiferromagnet

Shangguan, Y.*; Bao, S.*; Dong, Z.-Y.*; Xi, N.*; Gao, Y.-P.*; Ma, Z.*; Wang, W.*; Qi, Z.*; Zhang, S.*; Huang, Z.*; et al.

Nature Physics, 19(12), p.1883 - 1889, 2023/09

https://doi.org/10.1038/s41567-023-02212-2
 Times Cited Count：38 Percentile：94.16(Physics, Multidisciplinary)

Journal Articles

Field-tuned quantum renormalization of spin dynamics in the honeycomb lattice Heisenberg antiferromagnet YbCl$$_3$$

Sala, G.*; Stone, M. B.*; Hal$'a$sz, G. B.*; Lumsden, M. D.*; Fay, A, F,*; Pajerowski, D. M.*; Kawamura, Seiko; Kaneko, Koji; Mazzone, D. G.*; Simutis, G.*; et al.

Communications Physics (Internet), 6, p.234_1 - 234_7, 2023/08

https://doi.org/10.1038/s42005-023-01333-7
 Times Cited Count：10 Percentile：65.30(Physics, Multidisciplinary)

Journal Articles

11th International Workshop on Sample Environment

Kawamura, Seiko

Neutron News, 34(2), p.2 - 3, 2023/04

https://doi.org/10.1080/10448632.2023.2190708

Journal Articles

11th International Workshop on Sample Environment at Scattering Facilities

Kawamura, Seiko

Hamon, 33(1), P. 33, 2023/02

https://doi.org/10.5611/hamon.33.1_33

no abstracts in English

255 (Records 1-20 displayed on this page)