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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：0 Percentile：0.00(Materials Science, Multidisciplinary)

Journal Articles

Observation of field-induced single-ion magnetic anisotropy in a multiorbital Kondo alloy (Lu,Yb)Rh$$_2$$Zn$$_{20}$$

Kitazawa, Takafumi; Ikeda, Yoichi*; Sakakibara, Toshiro*; Matsuo, Akira*; Shimizu, Yusei*; Tokunaga, Yo; Haga, Yoshinori; Kindo, Koichi*; Nambu, Yusuke*; Ikeuchi, Kazuhiko*; et al.

Physical Review B, 108(8), p.085105_1 - 085105_7, 2023/08

https://doi.org/10.1103/PhysRevB.108.085105
 Times Cited Count：0 Percentile：0.00(Materials Science, Multidisciplinary)

Journal Articles

Partial breakdown of translation symmetry at a structural quantum critical point associated with a ferroelectric soft mode

Ishii, Yui*; Yamamoto, Arisa*; Sato, Naoki*; Nambu, Yusuke*; Kawamura, Seiko; Murai, Naoki; Ohara, Koji*; Kawaguchi, Shogo*; Mori, Takao*; Mori, Shigeo*

Physical Review B, 106(13), p.134111_1 - 134111_7, 2022/10

https://doi.org/10.1103/PhysRevB.106.134111
 Times Cited Count：0 Percentile：0.00(Materials Science, Multidisciplinary)

Journal Articles

Breakdown of linear spin-wave theory and existence of spinon bound states in the frustrated kagome-lattice antiferromagnet

Mattan, K.*; Ono, Toshio*; Kawamura, Seiko; Nakajima, Kenji; Nambu, Yusuke*; Sato, Taku*

Physical Review B, 105(13), p.134403_1 - 134403_8, 2022/04

https://doi.org/10.1103/PhysRevB.105.134403
 Times Cited Count：4 Percentile：33.23(Materials Science, Multidisciplinary)

Spin dynamics of the spin-1/2 kagome-lattice antiferromagnet Cs$$_{2}$$Cu$$_{3}$$SnF$$_{12}$$ was studied using high-resolution, time-of-flight inelastic neutron scattering. The flat mode, a characteristic of the frustrated kagome antiferromagnet, and the low-energy dispersive mode, which is dominated by magnons, can be well described by the linear spin-wave theory. However, the theory fails to describe three weakly dispersive modes between 9 and 14 meV. These modes could be attributed to two-spinon bound states, which decay into free spinons away from the zone center and at a high temperature, giving rise to continuum scattering.

Journal Articles

Neutron scattering study on yttrium iron garnet for spintronics

Nambu, Yusuke*; Shamoto, Shinichi

Journal of the Physical Society of Japan, 90(8), p.081002_1 - 081002_15, 2021/08

https://doi.org/10.7566/JPSJ.90.081002
 Times Cited Count：3 Percentile：30.49(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Triplon current generation in solids

Chen, Y.*; Sato, Masahiro*; Tang, Y.*; Shiomi, Yuki*; Oyanagi, Koichi*; Masuda, Takatsugu*; Nambu, Yusuke*; Fujita, Masaki*; Saito, Eiji

Nature Communications (Internet), 12, p.5199_1 - 5199_7, 2021/08

https://doi.org/10.1038/s41467-021-25494-7
 Times Cited Count：15 Percentile：69.32(Multidisciplinary Sciences)

Journal Articles

Competing spin modulations in the magnetically frustrated semimetal EuCuSb

Takahashi, Hidefumi*; Aono, Kai*; Nambu, Yusuke*; Kiyanagi, Ryoji; Nomoto, Takuya*; Sakano, Masato*; Ishizaka, Kyoko*; Arita, Ryotaro*; Ishiwata, Shintaro*

Physical Review B, 102(17), p.174425_1 - 174425_6, 2020/11

https://doi.org/10.1103/PhysRevB.102.174425
 Times Cited Count：17 Percentile：65.08(Materials Science, Multidisciplinary)

The competing magnetic ground states of the itinerant magnet EuCuSb, which has a hexagonal layered structure, were studied via magnetization, resistivity, and neutron-diffraction measurements on single-crystal samples. EuCuSb has a three-dimensional semimetallic band structure as confirmed by band calculation and angle-resolved photoelectron spectroscopy, consistent with the nearly isotropic metallic conductivity in the paramagnetic state. However, below the antiferromagnetic transition temperature of $$T$$$$_{rm N1}$$ (8.5 K), the resistivity, especially along the hexagonal axis, increases significantly. This implies the emergence of anisotropic magnetic ordering coupled to the conducting electrons. Neutron-diffraction measurements show that the Eu spins, which order ferromagnetically within each layer, are collinearly modulated (up-up-down-down) along the hexagonal axis below $$T$$$$_{rm N1}$$, followed by the partial emergence of helical spin modulation below $$T$$$$_{rm N2}$$ (6 K). Based on the observation of anomalous magnetoresistance with hysteretic behavior, we discuss the competing nature of the ground state inherent in a frustrated Heisenberg-like spin system with a centrosymmetric structure.

Journal Articles

Observation of magnon polarization

Nambu, Yusuke*; Barker, J.*; Okino, Yuki*; Kikkawa, Takashi*; Shiomi, Yuki*; Enderle, M.*; Weber, T.*; Winn, B.*; Graves-Brook, M.*; Tranquada, J. M.*; et al.

Physical Review Letters, 125(2), p.027201_1 - 027201_6, 2020/07

https://doi.org/10.1103/PhysRevLett.125.027201
 Times Cited Count：64 Percentile：94.61(Physics, Multidisciplinary)

Journal Articles

Science from the initial operation of HRC

Ito, Shinichi*; Yokoo, Tetsuya*; Masuda, Takatsugu*; Yoshizawa, Hideki*; Soda, Minoru*; Ikeda, Yoichi*; Ibuka, Soshi*; Kawana, Daichi*; Sato, Taku*; Nambu, Yusuke*; et al.

JPS Conference Proceedings (Internet), 8, p.034001_1 - 034001_6, 2015/09

https://doi.org/10.7566/JPSCP.8.034001

Journal Articles

Temperature and composition phase diagram in the iron-based ladder compounds Ba$$_{1-x}$$Cs$$_{x}$$Fe$$_{2}$$Se$$_{3}$$

Hawai, Takafumi*; Nambu, Yusuke*; Ogushi, Kenya*; Du, F.*; Hirata, Yasuyuki*; Avdeev, M.*; Uwatoko, Yoshiya; Sekine, Yurina; Fukazawa, Hiroshi; Ma, J.*; et al.

Physical Review B, 91(18), p.184416_1 - 184416_11, 2015/05

https://doi.org/10.1103/PhysRevB.91.184416
 Times Cited Count：17 Percentile：55.62(Materials Science, Multidisciplinary)

We investigated the iron-based ladder compounds (Ba, Cs)Fe$$_{2}$$Se$$_{3}$$, whose parent compounds, BaFe$$_{2}$$Se$$_{3}$$ and CsFe$$_{2}$$Se$$_{3}$$, have different space groups, formal valences of Fe and magnetic structures. Electrical resistivity, specific heat, magnetic susceptibility, X-ray diffraction and powder neutron diffraction measurements were conducted to obtain the temperature and composition phase diagram of this system. Block magnetism seen in BaFe$$_{2}$$Se$$_{3}$$ is drastically suppressed with Cs doping. In contrast, stripe magnetism observed in CsFe$$_{2}$$Se$$_{3}$$ more resilient to Ba doping. Novel magnetic structure appears in intermediate compositions, which is similar to the stripe magnetism of CsFe$$_{2}$$Se$$_{3}$$ but with different inter-ladder spin configuration. Intermediate compounds show insulating behavior, nevertheless finite T-linear contribution in specific heat was obtained at low temperature.

Journal Articles

Block magnetism coupled with local distortion in the iron-based spin-ladder compound BaFe$$_{2}$$Se$$_{3}$$

Nambu, Yusuke*; Ogushi, Kenya*; Suzuki, Shumpei*; Du, F.*; Avdeev, M.*; Uwatoko, Yoshiya*; Munakata, Koji*; Fukazawa, Hiroshi; Chi, S.*; Ueda, Yutaka*; et al.

Physical Review B, 85(6), p.064413_1 - 064413_5, 2012/02

https://doi.org/10.1103/PhysRevB.85.064413
 Times Cited Count：78 Percentile：91.65(Materials Science, Multidisciplinary)

Magnetism in the insulating BaFe$$_{2}$$Se$$_{3}$$ was examined through susceptibility, specific heat, resistivity and neutron diffraction measurements. After formation of a short-range magnetic correlation, a long-range ordering was observed below $$T_{rm N}$$ $$sim$$ 255 K. The transition is obscured by bulk properties. Magnetic moments are arranged to form a Fe$$_{4}$$ ferromagnetic unit, and each Fe$$_{4}$$ stacks antiferromagnetically. This block magnetism is of the third type among magnetic structures of ferrous materials. The magnetic ordering drives unusually large distortion via magnetoelastic coupling.

Oral presentation

Crystal field excitations in a magnetic field of Tb$$_3$$Ga$$_5$$O$$_{12}$$ showing thermal Hall effect

Mori, Michiyasu; Fujita, Masaki*; Nambu, Yusuke*; Kawamura, Seiko; Kofu, Maiko; Nakajima, Kenji; Urlich, C.*; Sushkov, O. P.*

no journal, , 

no abstracts in English

Oral presentation

Phonon and crystal field in Tb$$_3$$Ga$$_5$$O$$_{12}$$ having thermal Hall effect

Fujita, Masaki*; Nambu, Yusuke*; Kawamura, Seiko; Kofu, Maiko; Nakajima, Kenji; Urlich, C.*; Sushkov, O. P.*

no journal, , 

no abstracts in English

Oral presentation

Tensile deformation and texture evolution in brittle/ductile multilayered steel sheet studied by neutron diffraction

Xu, P. G.; Ojima, Mayumi*; Suzuki, Hiroshi; Nambu, Shoichi*; Inoue, Junya*; Onuki, Yusuke*; Harjo, S.; Akita, Koichi

no journal, , 

14 (Records 1-14 displayed on this page)
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