Article
Multidisciplinary Sciences
Jiangfan Wang, Yung-Yeh Chang, Chung-Hou Chung
Summary: This article investigates the microscopic origin and properties of the strange metal phase and proposes a mechanism to explain its emergence. By studying the Kondo-Heisenberg lattice model, it is found that the strange metal phase manifests as a fluctuating critical fermionic spin-liquid metal and exhibits characteristics of quantum criticality.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Multidisciplinary Sciences
Chao Yang, Haiwen Liu, Yi Liu, Jiandong Wang, Dong Qiu, Sishuang Wang, Yang Wang, Qianmei He, Xiuli Li, Peng Li, Yue Tang, Jian Wang, X. C. Xie, James M. Valles, Jie Xiong, Yanrong Li
Summary: Fermi liquid theory is the basis for understanding metals, but some quantum materials exhibit strange-metallic behavior that deviates from the traditional theory. This study shows that strange-metal properties also exist in a bosonic system, suggesting the presence of a fundamental principle governing transport beyond particle statistics.
Article
Crystallography
Mathieu Taupin, Silke Paschen
Summary: Strange metal behavior refers to a linear temperature dependence of the electrical resistivity that is not due to electron-phonon scattering. This phenomenon can be observed in various strongly correlated electron systems, and achieving a unified understanding of this behavior across different materials is a central problem in condensed matter physics.
Article
Multidisciplinary Sciences
Hisao Kobayashi, Yui Sakaguchi, Hayato Kitagawa, Momoko Oura, Shugo Ikeda, Kentaro Kuga, Shintaro Suzuki, Satoru Nakatsuji, Ryo Masuda, Yasuhiro Kobayashi, Makoto Seto, Yoshitaka Yoda, Kenji Tamasaku, Yashar Komijani, Premala Chandra, Piers Coleman
Summary: Using synchrotron radiation-based Mossbauer spectroscopy, we investigated the charge fluctuations of beta-YbAlB4's strange metal phase and observed the splitting of the absorption peak in the Fermi-liquid regime upon entering the critical regime. This splitting is interpreted as a result of single nuclear transition modulated by nearby electronic valence fluctuations, which are further enhanced by the formation of charged polarons. These critical charge fluctuations may serve as a distinctive signature of strange metals.
Article
Physics, Multidisciplinary
Lawrence S. Schulman
Summary: Power laws do not always indicate self-organized criticality, as they can also occur outside of critical points or for other reasons.
Article
Chemistry, Multidisciplinary
Ngoc-Toan Dang, Denis P. Kozlenko, Olga N. Lis, Sergey E. Kichanov, Yevgenii V. Lukin, Natalia O. Golosova, Boris N. Savenko, Dinh-Loc Duong, The-Long Phan, Tuan-Anh Tran, Manh-Huong Phan
Summary: The effects of pressure (0-20 GPa) on the magnetic and structural properties of Fe3GeTe2 are investigated. It is found that ferromagnetic ordering is suppressed and a paramagnetic ground state emerges under pressure exceeding a critical value of P-PM ~ 15 GPa. An anomalous pressure dependence of structural parameters and vibrational modes is observed at P-C ~ 7 GPa, which is attributed to an isostructural phase transformation. Density functional theory calculations support these experimental findings. This study highlights the importance of pressure in driving magnetic quantum criticality in layered vdW magnetic systems.
Article
Astronomy & Astrophysics
Osvaldo Ferreira, Eduardo S. Fraga
Summary: This study discusses strange stars mixed with fermionic dark matter in the presence of a strong magnetic field. The two-fluid Tolman-Oppenheimer-Volkov equations are used. The effects of dark matter and a strong magnetic field on the masses, radii, and tidal deformability of the stars are examined, with significant variations observed.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Elena Gati, John M. Wilde, Rustem Khasanov, Li Xiang, Sachith Dissanayake, Ritu Gupta, Masaaki Matsuda, Feng Ye, Bianca Haberl, Udhara Kaluarachchi, Robert J. McQueeney, Andreas Kreyssig, Sergey L. Bud'ko, Paul C. Canfield
Summary: Through various experimental techniques, we have observed changes in the properties of ferromagnetic phase transitions under pressure suppression and the emergence of magnetic phases at high pressures in LaCrGe3. Additionally, evidence suggests a complex relationship between these phase transitions.
Article
Materials Science, Multidisciplinary
Heike Eisenlohr, Matthias Vojta
Summary: The phenomenology of quantum phase transitions deals with physics at low temperatures and energies, often reaching millikelvin temperatures in solid-state experiments. This study explores how continuous magnetic quantum phase transitions are influenced, modified, or destroyed by the coupling to nuclear spins. Results show the sensitivity of quantum critical systems to small perturbations, affecting the observability of purely electronic quantum criticality at low temperatures.
Article
Physics, Nuclear
Feng Gao, Hao-Song Li
Summary: In this study, the magnetic moments of hidden-charm strange pentaquark states with different quantum numbers are calculated using different models. The results show that the magnetic moments vary with different spin-orbit couplings within the same model and when involving different models with the same angular momentum.
Article
Engineering, Environmental
Mi Lin, Yusen Wu, Baojia Qin, Weijian Cao, Junhong Liu, Zhenming Xu, Jujun Ruan
Summary: This study investigates the necessity and feasibility of photovoltaic waste recovery in China and quantifies the amount of photovoltaic waste. The study finds that the recovery of indium, selenium, cadmium, and gallium from photovoltaic waste is crucial to alleviate resource shortage, and the full recovery method can significantly reduce environmental burdens.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Marco Grilli, Carlo Di Castro, Giovanni Mirarchi, Goetz Seibold, Sergio Caprara
Summary: The strange metal behavior, characterized by linear-in-temperature resistivity, is still a mystery in solid-state physics. It is often associated with a quantum critical point and the divergence of order parameter correlation length. This study proposes a paradigm shift, focusing on a divergent characteristic time scale due to divergent dissipation in critical modes, while their correlation length remains finite. A mechanism based on the coupling between local order parameter fluctuations and electron density diffusive modes is proposed to explain the linear-in-T resistivity and logarithmic specific heat versus temperature ratio down to low temperatures.
Article
Materials Science, Multidisciplinary
T. Asaba, S. Lee, S. Seo, K. E. Avers, S. M. Thomas, R. Movshovich, J. D. Thompson, P. F. S. Rosa, E. D. Bauer, F. Ronning
Summary: YbFe5P3 is a quasi-one-dimensional heavy-fermion compound with good metallic properties and strong quantum fluctuations, exhibiting a modified Curie-Weiss behavior at high temperatures without magnetic ordering observed. Density functional theory calculations suggest a complex Fermi surface structure in this compound, leading to an extended regime of large quantum fluctuations prior to magnetic instability.
Article
Nuclear Science & Technology
Jian-Feng Xu
Summary: This study investigates the bulk viscosity of interacting strange quark matter in a strong external magnetic field. It shows that interquark interactions can greatly increase the bulk viscosity and cause irregular oscillations. The quasi-oscillation of the bulk viscosity with changes in density may facilitate the formation of magnetic domains.
NUCLEAR SCIENCE AND TECHNIQUES
(2021)
Article
Engineering, Electrical & Electronic
Mohamed Barboura, Adam Bouras
Summary: This article discusses the atypical power grid resilience of the northernmost point of the African countries against vandalism, and compares the performance of 3-wire and 4-wire MV power grids in different fault scenarios. The study shows that with proper adjustment of protection devices, the MALT system can operate safely without the neutral wire.
IET GENERATION TRANSMISSION & DISTRIBUTION
(2022)
Article
Nanoscience & Nanotechnology
Hanshen Tsai, Tomoya Higo, Kouta Kondou, Ayuko Kobayashi, Takafumi Nakano, Kay Yakushiji, Shinji Miwa, Yoshichika Otani, Satoru Nakatsuji
Summary: The study demonstrates the SOT switching of the Hall resistance in Mn3Sn heterostructures, finding that the sign of the spin Hall angle of heavy metals determines the direction of magnetic switching and the critical current density is around 10(11)A/m(2). Additionally, it is discovered that the spin current generated from the spin Hall effect contributes dominantly to the SOT compared to possible interfacial effects.
Article
Materials Science, Multidisciplinary
Takafumi Nakano, Tomoya Higo, Ayuko Kobayashi, Shinji Miwa, Satoru Nakatsuji, Kay Yakushiji
Summary: The study found that high-quality Mn3Sn thin films can be fabricated using Pt and Cu seed materials, resulting in smooth and c-plane oriented structures after postannealing. Anomalous Nernst effect signals were not degraded by a small amount of Cu mixture, and the postannealing temperature could be effectively lowered.
PHYSICAL REVIEW MATERIALS
(2021)
Correction
Physics, Applied
Mio Ishibashi, Kay Yakushiji, Masashi Kawaguchi, Arata Tsukamoto, Satoru Nakatsuji, Masamitsu Hayashi
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Mio Ishibashi, Kay Yakushiji, Masashi Kawaguchi, Arata Tsukamoto, Satoru Nakatsuji, Masamitsu Hayashi
Summary: The magnetic properties of rare earth-transition metal ferrimagnetic thin films are studied. It is found that the compensation of magnetic moments of rare earth and transition metal sublattices increases with decreasing film thickness. For thin TbFeCo films, Tb atoms do not contribute to the magnetization. The perpendicular magnetic anisotropy increases with a thin Co layer but drops to zero with a thin Tb layer. The Tb concentration at which magnetic compensation occurs decreases when the underlayer is changed from Pt to Ta.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Takumi Matsuo, Tomoya Higo, Daisuke Nishio-Hamane, Satoru Nakatsuji
Summary: The magnetic Weyl semimetallic state in the chiral antiferromagnet Mn3Sn has attracted attention for its potential in memory technology. Despite having a very small magnetization, the material exhibits large transverse responses that can be electrically manipulated. Through experiments, it has been confirmed that thin polycrystalline Mn3Sn films with coarse surfaces have a discontinuous structure of grains with diameters of around 100 nm, and they retain the anomalous Hall effect at room temperature.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Zili Feng, Susumu Minami, Shuhei Akamatsu, Akito Sakai, Taishi Chen, Daisuke Nishio-Hamane, Satoru Nakatsuji
Summary: Recent discoveries of topological magnets have led to the development of a simpler thermoelectric conversion module through the use of the anomalous Nernst effect (ANE). Designing materials suitable for industrial processes is crucial for accelerating this innovation, thus there is a high demand for a high-ANE polycrystalline material. A giant and robust room-temperature ANE has been reported in single crystals of the topological ferromagnet Fe3Ga, which can potentially be used in a polycrystalline form for an ANE-based thermopile. The study also explores the effect of Fe doping on the transport properties of FexGa4-x, revealing that tuning the Fermi energy near the topological nodal-web structure is key to enhancing the ANE. A high value of more than 5.1 mu V K-1 is observed in an extended region of composition, confirming the robust characteristics of the topological electronic structure.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Physics, Multidisciplinary
M. Ikhlast, S. Dasgupta, F. Theuss, T. Higo, Shunichiro Kittaka, B. J. Ramshaw, O. Tchernyshyov, C. W. Hicks, S. Nakatsuji
Summary: Piezomagnetism is a linear coupling between strain and magnetic order, enabling the control of magnetization. This study reports the observation of large piezomagnetism at room temperature in an antiferromagnetic Weyl semimetal, which allows strain to control the anomalous Hall effect. This finding has the potential for spintronics applications.
Article
Physics, Applied
Mio Ishibashi, Kay Yakushiji, Masashi Kawaguchi, Arata Tsukamoto, Satoru Nakatsuji, Masamitsu Hayashi
Summary: We conducted a systematic study on the current-induced motion of domain walls in TbFeCo ferrimagnetic thin films with a Pt underlayer. By varying the Tb concentration, we investigated the effect of magnetization compensation on the domain wall motion. We observed that the direction of domain wall movement changes at the magnetization compensation point, with FeCo-rich films moving against the current flow. When the film composition is slightly Tb-rich, the domain wall initially moves along the current but reverses its direction with increased current. These findings suggest the presence of competing torques in Tb-based ferrimagnets, resulting in slower domain wall velocity compared to Gd-based ferrimagnets.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Review
Materials Science, Multidisciplinary
Tomoya Higo, Satoru Nakatsuji
Summary: This article reviews the recent research progress on Mn3Sn, highlighting its functional properties as a metallic non-collinear antiferromagnet, and focusing on the fabrication and properties of Mn3Sn thin films essential for device applications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Hirokazu Tanaka, Tomoya Higo, Ryota Uesugi, Kazuto Yamagata, Yosuke Nakanishi, Hironobu Machinaga, Satoru Nakatsuji
Summary: The anomalous Nernst effect allows the conversion of perpendicular heat flux into electricity, facilitating large-scale production and flexibility through common thin-film techniques. ANE-based heat flux sensors can effectively evaluate heat flow and contribute to energy savings. However, the presence of in-plane heat flux complicates the evaluation of perpendicular heat flux. This study fabricates ANE-type heat flux sensors with selective detection of perpendicular heat flux, enabling practical application of thin-film thermoelectric devices through a simple fabrication process.
ADVANCED MATERIALS
(2023)
Article
Physics, Applied
Nico Budai, Hironari Isshiki, Ryota Uesugi, Zheng Zhu, Tomoya Higo, Satoru Nakatsuji, YoshiChika Otani
Summary: We propose a magnetic imaging technique using atomic force microscopy to measure the locally induced anomalous Nernst effect. By creating a local temperature gradient on a sample surface through tip contact and a neighboring Joule heating wire, we are able to image magnetic domains in the ferromagnetic Weyl semimetal Co2MnGa at room temperature with sub-hundred nanometer spatial resolution.
APPLIED PHYSICS LETTERS
(2023)
Article
Multidisciplinary Sciences
Hisao Kobayashi, Yui Sakaguchi, Hayato Kitagawa, Momoko Oura, Shugo Ikeda, Kentaro Kuga, Shintaro Suzuki, Satoru Nakatsuji, Ryo Masuda, Yasuhiro Kobayashi, Makoto Seto, Yoshitaka Yoda, Kenji Tamasaku, Yashar Komijani, Premala Chandra, Piers Coleman
Summary: Using synchrotron radiation-based Mossbauer spectroscopy, we investigated the charge fluctuations of beta-YbAlB4's strange metal phase and observed the splitting of the absorption peak in the Fermi-liquid regime upon entering the critical regime. This splitting is interpreted as a result of single nuclear transition modulated by nearby electronic valence fluctuations, which are further enhanced by the formation of charged polarons. These critical charge fluctuations may serve as a distinctive signature of strange metals.
Article
Chemistry, Multidisciplinary
Hirokazu Tanaka, Tomoya Higo, Ryota Uesugi, Kazuto Yamagata, Yosuke Nakanishi, Hironobu Machinaga, Satoru Nakatsuji
Summary: ANE-type heat flux sensors, fabricated using mass-producible roll-to-roll sputtering methods, selectively detect perpendicular heat flux by adjusting the net Seebeck coefficient in their thermopile circuit, paving the way for practical applications of thin-film thermoelectric devices.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Florian Theuss, Sayak Ghosh, Taishi Chen, Oleg Tchernyshyov, Satoru Nakatsuji, B. J. Ramshaw
Summary: In this study, we measure the full elastic tensors of Mn3Ge and Mn3Sn as a function of temperature and find strong magnetoelastic coupling in their respective antiferromagnetic phase transitions. The discontinuities in bulk moduli at the N??el transitions are significantly larger in Mn3Ge than in Mn3Sn, and we calculate the pressure derivatives of the N??el temperature based on the magnitudes of the discontinuities. Additionally, we measure the in-plane shear modulus in both compounds under different magnetic fields and observe similar behavior. Recent experiments have shown strong piezomagnetism in Mn3Sn, and our results suggest that Mn3Ge may be an even better candidate for this effect.
Article
Materials Science, Multidisciplinary
Shoya Sakamoto, Tomoya Higo, Masanobu Shiga, Kenta Amemiya, Satoru Nakatsuji, Shinji Miwa
Summary: In this paper, spontaneous XMCD spectra originating from the inverse triangular spin structure or the polarization of the cluster magnetic octupole were observed in the chiral antiferromagnet Mn3Sn thin film, which is consistent with recent theoretical predictions. This suggests that the inverse triangular spin structure can give rise to finite XMCD signals in the absence of net magnetization.