Article
Materials Science, Multidisciplinary
Johannes Richter, Oleg Derzhko, Juergen Schnack
Summary: Over the last decade, the interest in the spin-1/2 Heisenberg antiferromagnet (HAF) on the square kagome lattice has been growing. This model system is a prominent example of quantum magnetism with a quantum paramagnetic ground state, flat-band physics near the saturation field, and quantum scars. Recent numerical investigations have revealed a gapless spin liquid in the square kagome magnet. The study also provides insights into specific heat, entropy, and susceptibility, revealing low-temperature shoulder below the major maximum and a change in curvature just at a specific temperature, attributed to low-lying singlet excitations and the singlet-triplet gap.
Article
Materials Science, Multidisciplinary
Mutsuki Saito, Ryunosuke Takagishi, Nobuyuki Kurita, Masari Watanabe, Hidekazu Tanaka, Ryuji Nomura, Yoshiyuki Fukumoto, Kazuhiko Ikeuchi, Ryoichi Kajimoto
Summary: Cs2Cu3SnF12 and Rb2Cu3SnF12 are two spin-1/2 antiferromagnets with different structures, and their magnetic excitation structures were investigated using inelastic neutron scattering. Four single-magnon excitation modes were observed in Cs2Cu3SnF12, and a broad excitation continuum was found. In Rb2Cu3SnF12, singlet-triplet excitations from the pinwheel VBS state were confirmed, along with ghost modes caused by the enlargement of the chemical unit cell.
Article
Materials Science, Multidisciplinary
Tomonari Mizoguchi, Yoshihito Kuno, Yasuhiro Hatsugai
Summary: The study reveals characteristic band structures of fermions on a square kagome lattice, including flat bands and two spin-1 Dirac cones. Additionally, in the presence of an external field, the profile of the Chern numbers around the modified spin-1 Dirac cones coincides with the conventional one.
Article
Materials Science, Multidisciplinary
A. V. Syromyatnikov
Summary: In this study, a spin-1/2 Heisenberg antiferromagnet on the triangular lattice was discussed using the bond-operator technique (BOT). It was found that high-energy collective excitations and another high-energy quasiparticle exist in the system. Quantum fluctuations considerably alter the properties of conventional magnons, and the anomalous spin dynamics observed experimentally recently cannot be described by SWT.
Article
Materials Science, Multidisciplinary
Johannes Richter, Jurgen Schnack
Summary: The spin-1/2 Heisenberg antiferromagnet on the square-kagome (SK) lattice has been a subject of interest in quantum magnetism due to its high frustration. Recent discoveries of SK spin-liquid compounds further motivate theoretical studies of this model. This study investigates the temperature dependence of various thermodynamic properties of the SK antiferromagnet with different strength of nearest-neighbor bonds J1 and J2. The findings reveal different ground states and low-temperature behaviors depending on the ratio of J2/J1.
Article
Physics, Condensed Matter
Boqiang Li, Zongtang Wan, Yiru Song, Zhaohua Ma, Yuqian Zhao, Junfeng Wang, Yuesheng Li
Summary: We propose β-BaNi3(VO4)(2)(OH)(2) as a candidate for the spin-1 kagome Heisenberg antiferromagnet. Experimental measurements at low temperatures reveal properties similar to the pure S = 1 kagome Heisenberg antiferromagnetic model.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Yuan Gao, Yu-Chen Fan, Han Li, Fan Yang, Xu-Tao Zeng, Xian-Lei Sheng, Ruidan Zhong, Yang Qi, Yuan Wan, Wei Li
Summary: The recently synthesized NBCP compound is found to be an ideal realization of a S = 1/2 triangular-lattice antiferromagnet with significant easy-axis spin exchange anisotropy. By combining automatic parameter searching and tensor-network simulations, a microscopic model is established to accurately describe the material's properties, fitting well with experimental data.
NPJ QUANTUM MATERIALS
(2022)
Article
Multidisciplinary Sciences
X. Rao, G. Hussain, Q. Huang, W. J. Chu, N. Li, X. Zhao, Z. Dun, E. S. Choi, T. Asaba, L. Chen, L. Li, X. Y. Yue, N. N. Wang, J. -G. Cheng, Y. H. Gao, Y. Shen, J. Zhao, G. Chen, H. D. Zhou, X. F. Sun
Summary: Experimental results strongly suggest the survival of the quantum spin liquid state in YbMgGaO4 despite material disorder, shedding light on the impact of disorder on the true magnetic ground state of quantum spin liquid candidates.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Hong Li, Tao Li
Summary: The extreme frustration in the kagome antiferromagnet allows for the realization of numerous closely competing magnetic phases. Through simulation and calculation, it has been found that in a certain region, there is a competition between q = 3 and q = 4 Potts order, which cannot be explained by the conventional order-by-disorder mechanism. This region may host a nematic spin liquid ground state with an anisotropic ring structure.
Article
Materials Science, Multidisciplinary
A. Zelenskiy, T. L. Monchesky, M. L. Plumer, B. W. Southern
Summary: Compounds with magnetic Mn atoms forming AB-stacked kagome lattices, such as Mn3X, have attracted significant attention. A new general symmetry-based model reveals the presence of interplane Dzyaloshinskii-Moriya interactions and competitive anisotropic exchange interactions in these compounds. These interactions strongly impact the ground state configurations and elementary spin-wave excitations.
Article
Physics, Multidisciplinary
Leonardo Martinelli, Davide Betto, Kurt Kummer, Riccardo Arpaia, Lucio Braicovich, Daniele Di Castro, Nicholas B. Brookes, Marco Moretti Sala, Giacomo Ghiringhelli
Summary: Resonant inelastic x-ray scattering (RIXS) was used to investigate the magnetic dynamics of infinite-layer cuprate CaCuO2. It was found that the single magnon decays into a broad continuum of excitations, with the spin-flip character dominating. This continuum is proposed to originate from the decay of the magnon into spinon pairs, related to the high ring exchange J(c) of CaCuO2.
Article
Physics, Multidisciplinary
Xin-Yang Liu, Yuan Gao, Han Li, Wentao Jin, Junsen Xiang, Hai Jin, Ziyu Chen, Wei Li, Gang Su
Summary: Quantum spin liquids have no magnetic order and can be cooled using magnetocaloric effects, making them promising for helium-free refrigeration in space applications and quantum technologies.
COMMUNICATIONS PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
P. Prelovsek, M. Gomilsek, T. Arh, A. Zorko
Summary: This study presents an in-depth analysis of temperature-dependent dynamical spin correlations in the antiferromagnetic Heisenberg spin-1/2 model on the kagome lattice with additional interactions. The research shows that introducing additional interactions leads to an anisotropic dynamical response and affects the in-plane spin fluctuations, ultimately leading to the onset of a coplanar AFM ground state order. The results are in good agreement with experimental data on kagome AFM compounds, demonstrating the importance of dynamical spin correlations in understanding quantum spin liquids.
Article
Materials Science, Multidisciplinary
Pratyay Ghosh, Tobias Mueller, Ronny Thomale
Summary: The study presents the exact dimer ground state of a quantum antiferromagnet on the maple-leaf lattice, where a coupling anisotropy for one of the three inequivalent nearest-neighbor bonds is sufficient to stabilize the dimer state.
Article
Physics, Multidisciplinary
Henrik Schlueter, Johannes Richter, Juergen Schnack
Summary: Unconventional features such as plateaus or jumps in the magnetization curve at zero temperature are a characteristic of frustrated spin systems. However, very little is known about their behavior at non-zero temperatures. In this study, we examine the temperature dependence of the magnetization curve of the kagome lattice antiferromagnet, specifically at 1/3 of the saturation magnetization, and observe an asymmetric melting phenomenon. We compare our findings to the square-kagome lattice and find similar behavior at low temperatures but differences at 1/3 of the saturation magnetization.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Physics, Applied
Tokuro Shimokawa, Yohei Fukuoka, Masashi Fujisawa, Weimin Zhang, Susumu Okubo, Takahiro Sakurai, Hitoshi Ohta, Reddithota Vidyasagar, Hiroaki Yoshitomi, Shinya Kitayama, Takashi Kita
JOURNAL OF APPLIED PHYSICS
(2015)
Article
Materials Science, Multidisciplinary
Tokuro Shimokawa, Ken Watanabe, Hikaru Kawamura
Article
Materials Science, Multidisciplinary
H. Yamaguchi, H. Miyagai, Y. Kono, S. Kittaka, T. Sakakibara, K. Iwase, T. Ono, T. Shimokawa, Y. Hosokoshi
Article
Materials Science, Multidisciplinary
Hironori Yamaguchi, Yasuhiro Shinpuku, Tokuro Shimokawa, Kenji Iwase, Toshio Ono, Yohei Kono, Shunichiro Kittaka, Toshiro Sakakibara, Yuko Hosokoshi
Article
Physics, Multidisciplinary
Tokuro Shimokawa, Hikaru Kawamura
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2016)
Article
Physics, Multidisciplinary
Susumu Okubo, Ryohei Nakata, Shohei Ikeda, Naoki Takahashi, Takahiro Sakurai, Wei-Min Zhang, Hitoshi Ohta, Tokuro Shimokawa, Tru Sakai, Koji Okuta, Shigeo Hara, Hirohiko Sato
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2017)
Article
Physics, Multidisciplinary
Reddithota Vidyasagar, Takashi Kita, Takahiro Sakurai, Tokuro Shimokawa, Hitoshi Ohta
Article
Physics, Multidisciplinary
Ken Watanabe, Hikaru Kawamura, Hiroki Nakano, Toru Sakai
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2014)
Article
Physics, Multidisciplinary
Akira Okutani, Takanori Kida, Yasuo Narumi, Tokuro Shimokawa, Zentaro Honda, Koichi Kindo, Takehito Nakano, Yasuo Nozue, Masayuki Hagiwara
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2019)
Article
Physics, Multidisciplinary
Tokuro Shimokawa, Hikaru Kawamura
PHYSICAL REVIEW LETTERS
(2019)
Article
Environmental Sciences
Ken Watanabe, Ichiro Fujita, Makiko Iguchi, Makoto Hasegawa
Summary: Image-based river flow measurement methods are easy to use and safe, but may generate incorrect values depending on shooting environment. This study incorporated deep learning into the STIV technique and showed that it can improve efficiency, making it suitable for building a real-time measurement system.
Article
Materials Science, Multidisciplinary
Tokuro Shimokawa
Summary: Using a quantum typicality method, we investigated the finite-temperature properties of the S = 1/2 Shastry-Sutherland Heisenberg model and observed signatures of the finite-temperature phase transition associated with breaking the mirror symmetry. At very low temperatures, the local mirror order parameter exhibited an intriguing recovering phenomenon of the mirror symmetry, which may be understood from the nature of the ground and excited states of finite-size systems.
Article
Materials Science, Multidisciplinary
Tokuro Shimokawa, Tsuyoshi Okubo, Hikaru Kawamura
Article
Materials Science, Multidisciplinary
Daisuke Yamamoto, Hiroshi Ueda, Ippei Danshita, Giacomo Marmorini, Tsutomu Momoi, Tokuro Shimokawa
