Quantum spin wave excited from a Cr-Dy single-molecule magnet

Ling, B.-K.*; Chang, M.*; Zhai, Y.-Q.*; Deng, J.*; Kofu, Maiko*; Guo, H.*; Zhao, J.*; Fu, Z.*; Zheng, Y.-Z.*

Journal of the American Chemical Society, 147(13), p.10935 - 10942, 2025/03

https://doi.org/10.1021/jacs.4c13628

Magnetic and quadrupole coupling emerging in NdB 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

Inelastic neutron scattering experiments were carried out to understand the unusual successive order in NdB with the frustrated Shatry-Sutherland (SS) lattice. The pseudo-quartet with and splits into four levels in the magnetically ordered states. The spectra can be explained with the on-site magnetic interaction , the coupling of with quadrupole , and the uniaxial crystalline electric field. The -electron states reproduce the temperature dependences of the in-plane moment which is the primary order parameter, and a weakly induced 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.

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

Singular continuous and nonreciprocal phonons in quasicrystal AlPdMn

Matsuura, Masato*; Zhang, J.*; Kamimura, Yasushi*; Kofu, Maiko; Edagawa, Keiichi*

Physical Review Letters, 133(13), p.136101_1 - 136101_5, 2024/09

https://doi.org/10.1103/PhysRevLett.133.136101

Crystal-liquid duality driven ultralow two-channel thermal conductivity in -MgAgSb

Li, J.*; Li, X.*; Zhang, Y.*; Zhu, J.*; Zhao, E.*; Kofu, Maiko; Nakajima, Kenji; Avdeev, M.*; Liu, P.-F.*; Sui, J.*; et al.

Applied Physics Reviews (Internet), 11(1), p.011406_1 - 011406_8, 2024/03

https://doi.org/10.1063/5.0173680

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

Analyses of hydrogen local environments in metals and intermetallic compounds using inelastic neutron scattering calculations based on first-principles hydrogen adiabatic potentials

Tatsumi, Kazuyoshi; Okudaira, Takuya*; Kofu, Maiko; Rozyczko, P.*

Journal of Physics; Condensed Matter, 36(37), p.375901_1 - 375901_13, 2023/06

https://doi.org/10.1088/1361-648X/ad559b

Slow magnetic relaxation of linear trinuclear M(II)-Gd(III)-M(II) complexes with point group symmetry (M(II) = Zn(II) and Mg(II))

Masuda, Yuka*; Sakata, Shiomi*; Kayahara, Saori*; Irie, Natsumi*; Kofu, Maiko; Kono, Yohei*; Sakakibara, Toshiro*; Horii, Yoji*; Kajiwara, Takashi*

Journal of Physical Chemistry C, 127(6), p.3295 - 3306, 2023/02

https://doi.org/10.1021/acs.jpcc.2c08323

Two-dimensional quantum universality in the spin-1/2 triangular-lattice quantum antiferromagnet NaBaCo(PO)

Sheng, J.*; Wang, L.*; Candini, A.*; Jiang, W.*; Huang, L.*; Xi, B.*; Zhao, J.*; Ge, H.*; Zhao, N.*; Fu, Y.*; et al.

Proceedings of the National Academy of Sciences of the United States of America, 119(51), p.e2211193119_1 - e2211193119_9, 2022/12

https://doi.org/10.1073/pnas.2211193119

Optimization and inference of bin widths for histogramming inelastic neutron scattering spectra

Tatsumi, Kazuyoshi; Inamura, Yasuhiro; Kofu, Maiko; Kiyanagi, Ryoji; Shimazaki, Hideaki*

Journal of Applied Crystallography, 55(3), p.533 - 543, 2022/06

https://doi.org/10.1107/S1600576722003624

A data-driven bin-width optimization for the histograms of measured data sets based on inhomogeneous Poisson processes was developed in a neurophysiology study [Shimazaki & Shinomoto (2007). Neural Comput. 19, 1503-1527], and a successive study [Muto et al. (2019). J. Phys. Soc. Jpn, 88, 044002] proposed its application to inelastic neutron scattering (INS) data. In the present study, the results of the method on experimental INS time-of-flight data collected under different measurement conditions from a copper single crystal are validated. The extrapolation of the statistics on a given data set to other data sets with different total counts precisely infers the optimal bin widths on the latter. The histograms with the optimized bin widths statistically verify two fine-spectral feature examples in the energy and momentum transfer cross sections: (i) the existence of the phonon band gaps; and (ii) the number of plural phonon branches located close to each other. This indicates that the applied method helps in the efficient and rigorous observation of spectral structures important in physics and materials science like novel forms of magnetic excitation and phonon states correlated to lattice thermal conductivities.