Zobrazeno 1 - 10
of 12 712
pro vyhledávání: '"A Kawamata"'
Autor:
Taniguchi, T., Osato, K., Okabe, H., Kitazawa, T., Kawamata, M., Hashimoto, S., Ikeda, Y., Nambu, Y., Sari, D. P., Watanabe, I., Nakamura, J. G., Koda, A., Gouchi, J., Uwatoko, Y., Kittaka, S., Sakakibara, T., Mizumaki, M., Kawamura, N., Yamanaka, T., Hiraki, K., Sasaki, T., Fujita, M.
YbCu4Au is a unique material exhibiting multiple quantum fluctuations simultaneously. In this study, we investigated the field-induced criticality in YbCu4Au, based on comprehensive micro and macro measurements, including powder X-ray diffraction (XR
Externí odkaz:
http://arxiv.org/abs/2411.05280
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:
Tang, Yifei, Umemoto, Yoshihiko, Kawamoto, Yo, Kawamata, Masahiro, Asai, Shinichiro, Ikeda, Yoichi, Fujita, Masaki, Nambu, Yusuke
Publikováno v:
J. Phys.: Condens. Matter 37 035801 (2024). [Focus Issue on Frustrated Quantum Magnets]
Spin dynamics in the van der Waals antiferromagnet FeGa$_2$S$_4$ with triangular lattices are investigated using magnetometry, neutron scattering, and muon spin relaxation measurements. The characteristic spin relaxation time is thoroughly clarified
Externí odkaz:
http://arxiv.org/abs/2410.21594
Autor:
Kawamata, Yujiro
The derived McKay correspondence conjecture says that there is an equivalence of triangulated categories between the bounded derived categories of commutative and non-commutative crepant resolutions of a Gorenstein singularity. We will prove that thi
Externí odkaz:
http://arxiv.org/abs/2410.15340
Autor:
Nambu, Y., Kawamata, M., Pang, X., Murakawa, H., Avdeev, M., Kimura, H., Masuda, H., Hanasaki, N., Onose, Y.
Publikováno v:
Acta Cryst. B 80, 393-400 (2024). [Focused Issue on Magnetic Structures]
Magnetic structures of the noncentrosymmetric magnet Sr$_2$MnSi$_2$O$_7$ were examined through neutron diffraction for powder and single-crystalline samples, as well as magnetometry measurements. All allowed magnetic structures under the space group
Externí odkaz:
http://arxiv.org/abs/2410.04042
An Ising model is defined by a quadratic objective function known as the Hamiltonian, composed of spin variables that can take values of either $-1$ or $+1$. The goal is to assign spin values to these variables in a way that minimizes the value of th
Externí odkaz:
http://arxiv.org/abs/2406.18130
Autor:
Kawamoto, Y., Kikkawa, T., Kawamata, M., Umemoto, Y., Manning, A. G., Rule, K. C., Ikeuchi, K., Kamazawa, K., Fujita, M., Saitoh, E., Kakurai, K., Nambu, Y.
Publikováno v:
Appl. Phys. Lett. 124, 132406 (2024). Featured Article & AIP Publishing Showcase
Magnon spin currents in the ferrimagnetic garnet Tb3Fe5O12 with 4f electrons were examined through the spin-Seebeck effect and neutron scattering measurements. The compound shows a magnetic compensation, where the spin-Seebeck signal reverses above a
Externí odkaz:
http://arxiv.org/abs/2404.01603
Autor:
Kawamata, Yujiro
We will develop a formal non-commutative (NC) deformation theory of smooth algebraic varieties $X$ defined over a field $k$, and describe a semi-universal deformation where the tangent space $T^1$ and the obstruction space $T^2$ are given as subspace
Externí odkaz:
http://arxiv.org/abs/2402.15685
Estimation of conditional average treatment effects (CATEs) is an important topic in sciences. CATEs can be estimated with high accuracy if distributed data across multiple parties can be centralized. However, it is difficult to aggregate such data o
Externí odkaz:
http://arxiv.org/abs/2402.02672
Autor:
Osato, Kotaro, Taniguchi, Takanori, Okabe, Hirotaka, Kitazawa, Takafumi, Kawamata, Masahiro, Hongfei, Zhao, Ikeda, Yoichi, Nambu, Yusuke, Sari, Dita Puspita, Watanabe, Isao, Nakamura, Jumpei G, Koda, Akihiro, Gouchi, Jun, Uwatoko, Yoshiya, Fujita, Masaki
We report on the quantum criticality of YbCu$_4$Ni as revealed by our combined micro- and macro-measurements. We determine the crystal structure of YbCu$_4$Ni with site mixing by neutron diffraction measurements, which suggests the possible presence
Externí odkaz:
http://arxiv.org/abs/2312.12775