Zobrazeno 1 - 10
of 177
pro vyhledávání: '"Ohira-Kawamura Seiko"'
Autor:
Murai, Naoki, Suzuki, Katsuhiro, Nakajima, Masamichi, Kofu, Maiko, Ohira-Kawamura, Seiko, Inamura, Yasuhiro, Kajimoto, Ryoichi
We present a time-of-flight inelastic neutron scattering study of the iron-based superconductor Ba$_{0.75}$K$_{0.25}$Fe$_{2}$As$_{2}$, focusing on its spin dynamics. Our measurements reveal a periodic intensity modulation of magnetic signals along th
Externí odkaz:
http://arxiv.org/abs/2412.16870
Autor:
Kawamata, Masahiro, Pang, Xiaoqi, Murakawa, Hiroshi, Ohira-Kawamura, Seiko, Nakajima, Kenji, Masuda, Hidetoshi, Fujita, Masaki, Hanasaki, Noriaki, Onose, Yoshinori, Nambu, Yusuke
Magnetic excitations in the noncentrosymmetric magnet Sr$_2$MnSi$_2$O$_7$ were investigated through inelastic neutron scattering measurements. Major magnetic excitations are limited up to the energy transfer of 0.5 meV, and two magnon branches under
Externí odkaz:
http://arxiv.org/abs/2410.22741
Autor:
Gao, Bin, Chen, Tong, Liu, Chunxiao, Klemm, Mason L., Zhang, Shu, Ma, Zhen, Xu, Xianghan, Won, Choongjae, McCandless, Gregory T., Murai, Naoki, Ohira-Kawamura, Seiko, Moxim, Stephen J., Ryan, Jason T., Huang, Xiaozhou, Wang, Xiaoping, Chan, Julia Y., Cheong, Sang-Wook, Tchernyshyov, Oleg, Balents, Leon, Dai, Pengcheng
In magnetically ordered insulators, elementary quasiparticles manifest as spin waves - collective motions of localized magnetic moments propagating through the lattice - observed via inelastic neutron scattering. In effective spin-1/2 systems where g
Externí odkaz:
http://arxiv.org/abs/2408.15957
Publikováno v:
EPJ Web of Conferences, Vol 272, p 02012 (2022)
The polychromatic incident energy measurements using chopper spectrometers at pulsed sources enables us to measure dynamics with different energy resolutions, i.e., different time-windows with a single-measurement. By increasing the possible time-win
Externí odkaz:
https://doaj.org/article/9b3a223881684a479afbc551c4238a7e
Autor:
Shangguan, Yanyan, Bao, Song, Dong, Zhao-Yang, Xi, Ning, Gao, Yi-Peng, Ma, Zhen, Wang, Wei, Qi, Zhongyuan, Zhang, Shuai, Huang, Zhentao, Liao, Junbo, Zhao, Xiaoxue, Zhang, Bo, Cheng, Shufan, Xu, Hao, Yu, Dehong, Mole, Richard A., Murai, Naoki, Ohira-Kawamura, Seiko, He, Lunhua, Hao, Jiazheng, Yan, Qing-Bo, Song, Fengqi, Li, Wei, Yu, Shun-Li, Li, Jian-Xin, Wen, Jinsheng
Publikováno v:
Nature Physics 19, 1883-1889 (2023)
Fractional magnetisation plateaus, in which the magnetisation is pinned at a fraction of its saturated value within a range of external magnetic field, are spectacular macroscopic manifestations of the collective quantum behaviours. One prominent exa
Externí odkaz:
http://arxiv.org/abs/2312.15932
Autor:
Kim, Chaebin, Kim, Sujin, Park, Pyeongjae, Kim, Taehun, Jeong, Jaehong, Ohira-Kawamura, Seiko, Murai, Naoki, Nakajima, Kenji, Chernyshev, A. L., Mourigal, Martin, Kim, Sung-Jin, Park, Je-Geun
The Kitaev model, a honeycomb network of spins with bond-dependent anisotropic interactions, is a rare example of having a quantum spin liquid ground state. Although most Kitaev model candidate materials eventually order magnetically due to inevitabl
Externí odkaz:
http://arxiv.org/abs/2304.13236
Autor:
Gao, Bin, Chen, Tong, Yan, Han, Duan, Chunruo, Huang, Chien-Lung, Yao, Xu Ping, Ye, Feng, Balz, Christian, Stewart, J. Ross, Nakajima, Kenji, Ohira-Kawamura, Seiko, Xu, Guangyong, Xu, Xianghan, Cheong, Sang-Wook, Morosan, Emilia, Nevidomskyy, Andriy H., Chen, Gang, Dai, Pengcheng
Publikováno v:
Physical Review B 2022
Quantum spin liquid (QSL) is a disordered state of quantum-mechanically entangled spins commonly arising from frustrated magnetic dipolar interactions. However, QSL in some pyrochlore magnets can also come from frustrated magnetic octupolar interacti
Externí odkaz:
http://arxiv.org/abs/2209.04590
We have investigated the origin of the magnetic dipole correlations $\langle \sigma_{\boldsymbol{Q}}^z \sigma_{\boldsymbol{-Q}}^z \rangle$ characterized by the modulation wave vector $\boldsymbol{k} \sim (\tfrac{1}{2},\tfrac{1}{2},\tfrac{1}{2})$ obse
Externí odkaz:
http://arxiv.org/abs/2109.08799
Autor:
Nakajima Kenji, Ohira-Kawamura Seiko, Kikuchi Tatsuya, Kajimoto Ryoichi, Takahashi Nobuaki, Nakamura Mitsutaka, Soyama Kazuhiko, Osakabe Toyotaka
Publikováno v:
EPJ Web of Conferences, Vol 83, p 03011 (2015)
We report the design of the beam-transport system (especially the vertical geometry) for a cold-neutron disk-chopper spectrometer AMATERAS at J-PARC. Based on the elliptical shape, which is one of the most effective geometries for a ballistic mirror,
Externí odkaz:
https://doaj.org/article/15abef2f9af847f5888cb8c2a3bc2542
Autor:
Qin, Yayuan, Shen, Yao, Liu, Changle, Wo, Hongliang, Gao, Yonghao, Feng, Yu, Zhang, Xiaowen, Ding, Gaofeng, Gu, Yiqing, Wang, Qisi, Shen, Shoudong, Walker, Helen C., Bewley, Robert, Xu, Jianhui, Boehm, Martin, Steffens, Paul, Ohira-Kawamura, Seiko, Murai, Naoki, Schneidewind, Astrid, Tong, Xin, Chen, Gang, Zhao, Jun
Publikováno v:
Science Bulletin 67, 38-44 (2022)
We report thermodynamic and neutron scattering measurements of the triangular-lattice quantum Ising magnet TmMgGaO 4 in longitudinal magnetic fields. Our experiments reveal a quasi-plateau state induced by quantum fluctuations. This state exhibits an
Externí odkaz:
http://arxiv.org/abs/2011.09376