Article
Physics, Multidisciplinary
S. E. Nikitin, B. Fak, K. W. Kraemer, T. Fennell, B. Normand, A. M. Laeuchli, Ch Rueegg
Summary: CrBr3 is an excellent realization of the two-dimensional honeycomb ferromagnet, offering a bosonic equivalent of graphene with Dirac magnons and topological character. In this study, inelastic neutron scattering measurements were performed to update previous data and provide a definitive comparison with recent experimental claims and theoretical predictions. The results demonstrate the characteristics of CrBr3, such as ideal Dirac magnon dispersion and isospin winding, but also highlight the need for more sophisticated theoretical analysis.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Fei Chen, Rafael M. Fernandes, Morten H. Christensen
Summary: By calculating the dynamic spin susceptibility of 3D superconductors, we find that the appearance of a spin resonance mode is determined by the topology of hot lines connected by the magnetic wave vector on the Fermi surface, which has implications for the study of unconventional superconductors.
Article
Materials Science, Multidisciplinary
S. Cronenberger, H. Boukari, D. Ferrand, J. Cibert, D. Scalbert
Summary: By combining spatiotemporal spin noise spectroscopy with dynamic light scattering, spatial resolutions down to λ/10 can be achieved. This method was applied to a system of localized electron spins in an insulating n-doped CdTe layer, revealing long spin jump distances of approximately 2.7 μm. The combination of techniques allowed for the unraveling of contributions of spin-orbit and hyperfine fields in electron spin relaxation, leading to the determination of all relevant parameters for spin dynamics in a self-consistent manner.
Article
Physics, Multidisciplinary
Yao Wang, Yuan Chen, Thomas P. Devereaux, Brian Moritz, Matteo Mitrano
Summary: The manipulation of spins with ultrafast lasers presents a promising approach to control the properties of quantum materials. The study demonstrates that ultrafast pump-induced spin excitations in Mott insulators can lead to a prompt softening of spin excitation energy, with implications for superconducting pairing correlations.
COMMUNICATIONS PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Hal Tasaki, Haruki Watanabe
Summary: In this study, a general inequality is proven that relates (off-diagonal) long-range order with the charge gap in a large class of quantum many-body systems with U(1) symmetry. The implications of this inequality vary depending on the type of system, such as bosons or fermions on a lattice, or a quantum spin system.
Article
Materials Science, Multidisciplinary
Alireza Akbari, Burkhard Schmidt, Peter Thalmeier
Summary: We investigate the dispersion of dispersive paramagnetic excitons on the honeycomb lattice originating from the crystalline electric field split localized f-electron states in the paramagnetic state due to intersite exchange. We analyze the possible models and calculate the closed expressions for the magnetic exciton dispersion using both response function formalism and bosonic Bogoliubov approach. By calculating the Berry curvatures and Chern numbers of paramagnetic excitons, we show that one of the models supports nontrivial topological states with excitonic topological edge states with Dirac dispersion lying in the zone boundary gap without the presence of magnetic order.
Article
Multidisciplinary Sciences
Haoxiang Li, T. T. Zhang, A. Said, G. Fabbris, D. G. Mazzone, J. Q. Yan, D. Mandrus, Gabor B. Halasz, S. Okamoto, S. Murakami, M. P. M. Dean, H. N. Lee, H. Miao
Summary: The study reveals a coupling between phonons and Kitaev magnetic excitations in alpha-RuCl3, where optical phonons show intensity enhancement near the Kitaev energy and giant phonon softening occurs near the Z(2) gauge flux energy scale.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Condensed Matter
Die Hu, Yu Feng, Jitae T. Park, Hongliang Wo, Qisi Wang, Frederic Bourdarot, Alexandre Ivanov, Jun Zhao
Summary: In this study, polarized neutron scattering measurements were conducted on the low energy spin fluctuations of the iron-selenide superconductor Li0.8Fe0.2ODFeSe both below and above its superconducting transition temperature of T(c) = 41 K. The experiments confirmed the magnetic resonance mode near 21 meV, and found that the spin excitations were isotropic in spin space at 5 <= E, <= 29 meV in both the superconducting and normal states. The results suggest that the resonance mode in iron-based superconductors becomes isotropic when the effects of spin-orbit coupling and magnetic/nematic order are minimized, similar to what is observed in cuprate superconductors.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Physics, Multidisciplinary
Yaofeng Xie, Lebing Chen, Tong Chen, Qi Wang, Qiangwei Yin, J. Ross Stewart, Matthew B. Stone, Luke L. Daemen, Erxi Feng, Huibo Cao, Hechang Lei, Zhiping Yin, Allan H. MacDonald, Pengcheng Dai
Summary: The study reveals the evolution of spin excitations in 2D metallic kagome lattice materials, particularly in antiferromagnetic FeSn and paramagnetic CoSn, and identifies anomalous flat modes overlooked by the neutron scattering community for many years. The measurements show well-defined spin waves and correlated paramagnetic scattering in the materials, providing important insights into the spin excitations in these systems.
COMMUNICATIONS PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
J. Gaudet, H. -y. Yang, E. M. Smith, T. Halloran, J. P. Clancy, J. A. Rodriguez-Rivera, Guangyong Xu, Y. Zhao, W. C. Chen, G. Sala, A. A. Aczel, B. D. Gaulin, F. Taft, C. Broholm
Summary: The magnetism of a rocksalt fcc rare-earth monopnictide HoBi, a topological material candidate with extreme magnetoresistance, is studied. The cubic crystal electric field of the Ho3+ non-Kramers J = 8 spin-orbital multiplet results in six nearly degenerate low-energy levels, forming an anisotropic magnetic moment coupled to the lattice. The paramagnetic neutron scattering in the cubic phase for T > TN = 5.72(1) K indicates dominant antiferromagnetic interactions between 2 2 Ho spins separated by {100} and ferromagnetic interactions between spins displaced by { 1 20}, while a type-II AFM long-range order with k = (1 1 2) and tetragonal lattice distortion develops for T < TN.
Article
Physics, Condensed Matter
H. Cein Mandujano, Sandra L. Gonzalez, Nathan Episcopo, Uma Sitharaman, Narayan Poudel, Krzysztof Gofryk, Yahir E. Garay, Jorge A. Lopez, Qiang Zhang, Stuart Calder, Harikrishnan S. Nair
Summary: The Li-3((LiCr)(Te/Sb))O-6 compounds were studied using various techniques to characterize their crystal structure and magnetic properties, revealing specific heat anomalies and magnetic anomaly temperatures. The results suggest a scenario of short-range magnetic correlations as the magnetic ground states of these compounds.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Materials Science, Multidisciplinary
H. Lane, E. Pachoud, J. A. Rodriguez-Rivera, M. Songvilay, G. Xu, P. M. Gehring, J. P. Attfield, R. A. Ewings, C. Stock
Summary: VI3 is a ferromagnet with planar honeycomb sheets of bonded V3+ ions held together by van der Waals forces. Neutron spectroscopy is applied to measure two-dimensional magnetic excitations in the ferromagnetic phase. The study reveals the mechanism of magnetic anisotropy in VI3, providing insights into its spatially long-ranged two-dimensional ferromagnetism.
Article
Physics, Multidisciplinary
Chang Liu, JianLei Shen, JiaCheng Gao, ChangJiang Yi, Di Liu, Tao Xie, Lin Yang, Sergey Danilkin, GuoChu Deng, WenHong Wang, ShiLiang Li, YouGuo Shi, HongMing Weng, EnKe Liu, HuiQian Luo
Summary: A comprehensive neutron scattering study on the spin excitations in the magnetic Weyl semimetal Co3Sn2S2 reveals complex spin dynamics, including in-plane and out-of-plane dispersions of spin waves in different states, as well as a spin wave gap. Effective exchange interactions were estimated using a semi-classical Heisenberg model, indicating a large spin stiffness and significant contribution from Weyl fermions in this three-dimensional correlated system.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2021)
Article
Materials Science, Multidisciplinary
L. Stoppel, S. Hayashida, Z. Yan, A. Podlesnyak, A. Zheludev
Summary: In the S = 1 easy-plane-type triangular antiferromagnets CsFeCl3 and RbFeCl3, magnetic excitations were investigated using a combination of inelastic neutron scattering measurements and spin-wave theory calculations. An established exchange-coupling Hamiltonian was used, but failed to adequately describe the measured intensities, especially in RbFeCl3. The observed anomalies, such as anisotropic azimuthal intensity distribution, were attributed to long-range dipolar interactions.
Article
Multidisciplinary Sciences
T. Weber, D. M. Fobes, J. Waizner, P. Steffens, G. S. Tucker, M. Bohm, L. Beddrich, C. Franz, H. Gabold, R. Bewley, D. Voneshen, M. Skoulatos, R. Georgii, G. Ehlers, A. Bauer, C. Pfleiderer, P. Boeni, M. Janoschek, M. Garst
Summary: The study found that the motion of a spin excitation in materials with nontrivial magnetic order is deflected, similar to the effect of the Lorentz force on a charged particle in an orbital magnetic field. By using neutron scattering, researchers investigated the propagation of magnons in a lattice of skyrmion tubes in manganese silicide and discovered a topological magnon band structure in reciprocal space.
Article
Physics, Multidisciplinary
P. A. Alekseev, J-M. Mignot, P. S. Savchenkov, V. N. Lazukov
Article
Multidisciplinary Sciences
W. T. Fuhrman, J. R. Chamorro, P. A. Alekseev, J. -M. Mignot, T. Keller, J. A. Rodriguez-Rivera, Y. Qiu, P. Nikolic, T. M. McQueen, C. L. Broholm
NATURE COMMUNICATIONS
(2018)
Article
Multidisciplinary Sciences
Yejun Feng, Yishu Wang, D. M. Silevitch, J. -Q. Yan, Riki Kobayashi, Masato Hedo, Takao Nakama, Yoshichika Onuki, A. V. Suslov, B. Mihaila, P. B. Littlewood, T. F. Rosenbaum
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2019)
Article
Physics, Multidisciplinary
P. G. Niklowitz, M. Hirschberger, M. Lucas, P. Cermak, A. Schneidewind, E. Faulhaber, J-M Mignot, W. J. Duncan, A. Neubauer, C. Pfleiderer, F. M. Grosche
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Multidisciplinary
P. Y. Portnichenko, A. Akbari, S. E. Nikitin, A. S. Cameron, A. Dukhnenko, V. B. Filipov, N. Yu Shitsevalova, P. Cermak, I Radelytskyi, A. Schneidewind, J. Ollivier, A. Podlesnyak, Z. Huesges, J. Xu, A. Ivanov, Y. Sidis, S. Petit, J-M Mignot, P. Thalmeier, D. S. Inosov
Article
Multidisciplinary Sciences
R. Okuma, D. Ueta, S. Kuniyoshi, Y. Fujisawa, B. Smith, C. H. Hsu, Y. Inagaki, W. Si, T. Kawae, H. Lin, F. C. Chuang, T. Masuda, R. Kobayashi, Y. Okada
SCIENTIFIC REPORTS
(2020)
Article
Physics, Multidisciplinary
Daichi Ueta, Riki Kobayashi, Hiroki Sawada, Yuki Iwata, Shin-ichiro Yano, Shingo Kuniyoshi, Yuita Fujisawa, Takatsugu Masuda, Yoshinori Okada, Shinichi Itoh
Summary: The study reveals that in the ordered state, the magnetic moments in CeTe2Se point along the magnetic hard axis, while in CeTe3 they point along the magnetic easy axis. Inelastic neutron scattering experiments and CEF analysis show that the CEF ground states of CeTe3 and CeTe2Se are Gamma((1))(7), consistent with easy-plane-type magnetic anisotropy. The orientation of the magnetic moment is influenced by the competition between the CEF ground state and the restriction of magnetic fluctuations by antisymmetric spin-orbit interaction.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Materials Science, Multidisciplinary
D. S. Inosov, S. Avdoshenko, P. Y. Portnichenko, Eun Sang Choi, A. Schneidewind, J-M Mignot, M. Nikolo
Summary: The anisotropy of phase transitions in rare-earth borides can be qualitatively understood by considering the crystal-electric-field scheme of a pair of rare-earth ions in the lattice. This anisotropy is of local origin, making it easier to describe than the ordered phases themselves.
Article
Materials Science, Multidisciplinary
P. A. Alekseev, J-M Mignot, D. T. Adroja, V. N. Lazukov, H. Tanida, Y. Muro, M. Sera, T. Takabatake, P. Steffens, S. Rols
Article
Materials Science, Multidisciplinary
P. Y. Portnichenko, S. E. Nikitin, A. Prokofiev, S. Paschen, J-M Mignot, J. Ollivier, A. Podlesnyak, Siqin Meng, Zhilun Lu, D. S. Inosov
Article
Materials Science, Multidisciplinary
Kazuya Suyama, Kazuaki Iwasa, Yuka Otomo, Keisuke Tomiyasu, Hajime Sagayama, Ryoko Sagayama, Hironori Nakao, Reiji Kumai, Yoshinori Kitajima, Francoise Damay, Jean-Michel Mignot, Akira Yamada, Tatsuma D. Matsuda, Yuji Aoki
Article
Materials Science, Multidisciplinary
Kazuaki Iwasa, Yuka Otomo, Kazuya Suyama, Keisuke Tomiyasu, Seiko Ohira-Kawamura, Kenji Nakajima, Jean-Michel Mignot
Article
Materials Science, Multidisciplinary
Kazuaki Iwasa, Keisuke T. Matsumoto, Takahiro Onimaru, Toshiro Takabatake, Jean-Michel Mignot, Arsen Gukasov
Proceedings Paper
Physics, Condensed Matter
Riki Kobayashi, Haruki Takamura, Yasuyuki Higa, Yoichi Ikeda, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Hideki Yoshizawa, Naofumi Aso
INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2016)
(2017)
Article
Materials Science, Multidisciplinary
P. Y. Portnichenko, S. Paschen, A. Prokofiev, M. Vojta, A. S. Cameron, J. -M. Mignot, A. Ivanov, D. S. Inosov
