Article
Multidisciplinary Sciences
Ying Xiang, Qing Li, Yongkai Li, Wei Xie, Huan Yang, Zhiwei Wang, Yugui Yao, Hai-Hu Wen
Summary: The authors report the two-fold rotational symmetry of superconductivity and signatures of an in-plane nematic electronic state in CsV3Sb5 under in-plane magnetic field. Interestingly, the two orders of superconductivity and nematic electronic state are orthogonal to each other in terms of the field direction of the minimum resistivity, shedding new light on understanding the physical properties of CsV3Sb5.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Xingyu Wang, Dongliang Gong, Bo Liu, Xiaoyan Ma, Jinyu Zhao, Pengyu Wang, Yutao Sheng, Jing Guo, Liling Sun, Wen Zhang, Xinchun Lai, Shiyong Tan, Yi-feng Yang, Shiliang Li
Summary: The resistivity of URu2-xFexSi2 samples is influenced by uniaxial pressure, revealing qualitative differences between the hidden order and large-moment antiferromagnetic phases.
CHINESE PHYSICS LETTERS
(2022)
Article
Electrochemistry
Hiroyuki Fujimoto, Keiji Shimoda, Miwa Murakami, Hisao Kiuchi, Shigeharu Takagi, Gentaro Kano, Mitsuo Kawasaki, Zempachi Ogumi, Takeshi Abe
Summary: Investigations on the intercalation process of Li into turbostratic graphite using operando synchrotron X-ray diffraction and Li-7-NMR spectroscopy revealed the formation of LiC9 and LiC6 in-plane structures and a short-range ordered structure in turbostratic graphite, without the formation of a stage structure with periodic distance in the c-axis direction.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Inorganic & Nuclear
Arun Ramanathan, Johannes E. Leisen, Henry S. La Pierre
Summary: The detailed structural characterization of 213 honeycomb systems is crucial for various fundamental areas and technical applications. The cation ordering in the honeycomb layer of Na(2)LnO(3) materials has been confirmed, and these materials adopt a C2/c supercell structure.
INORGANIC CHEMISTRY
(2021)
Article
Mathematics, Interdisciplinary Applications
David Spichak, Andres Aragoneses
Summary: This paper analyzes the impact of sorting protocols on the structure revealed by the Fisher-Shannon plane, revealing the details and characteristic fingerprints of chaotic dynamics, and discovering the fractal behavior of chaotic maps.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Chemistry, Multidisciplinary
Sambhu Radhakrishnan, Karl Lauwers, C. Vinod Chandran, Julien Trebosc, Sreeprasanth Pulinthanathu Sree, Johan A. Martens, Francis Taulelle, Christine E. A. Kirschhock, Eric Breynaert
Summary: Layered double hydroxides (LDHs) play important roles in various fields, and the interplay between carbonate and pH determines the LDH structure and aluminum ordering. New crystallography techniques have been used to reveal the structure and ordering of aluminum in LDH, providing valuable insights for further research.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Physical
Karel Asselman, Sambhu Radhakrishnan, Nick Pellens, C. Vinod Chandran, Maarten Houlleberghs, Yijue Xu, Johan A. Martens, Sreeprasanth Pulinthanathu Sree, Christine E. A. Kirschhock, Eric Breynaert
Summary: A reproducible synthesis strategy for ultracrystalline K,Na-aluminosilicate JBW zeolite is reported, and the detailed structural analysis reveals its exceptional degree of ordering and flexibility, making it a suitable model system for developing NMR modeling methods.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Ilya V. Yakovlev, Vladimir I. Zaikovskii, Mariya A. Kazakova, Evgeniy S. Papulovskiy, Olga B. Lapina, Jean-Baptiste d'Espinose de Lacaillerie
Summary: In this study, the influence of strong metal-support interaction on two metastable alumina phases, y-Al2O3 and X-Al2O3, was investigated using 59Co Internal Field NMR and high-resolution transmission electron microscopy. It was found that the metallic particles supported on X-Al2O3 were larger and contained more active hcp phase, while those on y-Al2O3 were smaller. The presence of hydroxyl groups on y-Al2O3 facilitated the dispersion of Co precursor, leading to the formation of smaller metal Co nanoparticles.
JOURNAL OF CATALYSIS
(2023)
Article
Multidisciplinary Sciences
Luka Mesarec, Wojciech Gozdz, Veronika Kralj-Iglic, Samo Kralj, Ales Iglic
Summary: The impact of the intrinsic curvature of in-plane orientationally ordered curved flexible nematic molecules attached to closed 3D flexible shells was studied numerically. A Helfrich-Landau-de Gennes-type mesoscopic approach was adopted where the flexible shell's curvature field and in-plane nematic field are coupled and concomitantly determined in the process of free energy minimisation. We demonstrate that this coupling has the potential to generate a rich diversity of qualitatively new shapes of closed 3D nematic shells and the corresponding specific in-plane orientational ordering textures, which strongly depend on the shell's volume-to-surface area ratio, so far not predicted in mesoscopic-type numerical studies of 3D shapes of closed flexible nematic shells.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
A. Zeng, J. Jiao, H. Zhang, E. Zhao, W. Yin, B. -T. Wang, X. Xiao
Summary: In this study, the effects of in-plane cationic-ordering degree on the activity and stability of anionic redox reactions (ARR) were investigated using layered oxide Nax[LiyMn1-y]O2 as model compounds. It was found that a high cationic-ordering degree in the Nax[LiyMn1-y]O2 cathode resulted in higher ARR capacity and better cycling stability. Experimental and theoretical results also revealed that high-degree ordering of in-plane cations played a positive role in stabilizing the ARR structure and suppressing surface/interface side reactions. This research not only clarifies the relationship between ARR and superstructure, but also provides an accessible approach to optimize layered oxide cathodes with ARR activity.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Physics, Multidisciplinary
Edwin Herrera, Victor Barrena, Isabel Guillamon, Jose Augusto Galvis, William J. Herrera, Jose Castilla, Dai Aoki, Jacques Flouquet, Hermann Suderow
Summary: The researchers used scanning tunnelling microscopy to reveal a 1D charge density wave in URu2Si2, demonstrating a potential connection with the hidden order state and indicating that charge interactions are among the most relevant features competing with hidden order in URu2Si2.
COMMUNICATIONS PHYSICS
(2021)
Article
Electrochemistry
Nicholas S. Grundish, Hailong Lyu, Ieuan D. Seymour, Graeme Henkelman, Hadi Khani
Summary: A strategy of substituting Na+ and Fe3+ for Ni2+ is employed to successfully suppress the structural phenomena in layered Na3Ni2SbO6 cathode material, resulting in a sloping voltage curve. Sodium doping into the MO2 layer remains a promising strategy for enabling commercial Na-xMO2 cathodes by lowering the kinetic barrier.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Nanoscience & Nanotechnology
Carlos Mera Acosta, Elton Ogoshi, Jose Antonio Souza, Gustavo M. Dalpian
Summary: Magnetic materials have a wide range of applications in technology, and the development of 2D materials has opened up new possibilities for studying magnetic compounds. Machine learning methods can be used to predict and understand magnetic ordering in 2D materials more effectively.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Rajan Saini, Saurabh Kapoor, Daniel R. Neuville, Randall E. Youngman, Bianca M. Cerrutti, John S. McCloy, Hellmut Eckert, Ashutosh Goel
Summary: This study focuses on the relationship between the solubility of sulfur (as SO3) and the structure of Na2O-B2O3-SiO2 glasses. The research found an inverse correlation between the sulfur solubility and the degree of network polymerization in the glasses. While the modification of SO3 can compete with depolymerization mechanisms, the conversion of BO3 to BO4 induced by alkali cations is dominant. These findings have important implications for understanding the control of sulfur solubility in borosilicate-based nuclear waste glasses.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Physics, Fluids & Plasmas
Ze-Hao Chen, Zhi-Xi Wu, Jian-Yue Guan
Summary: The study examines the evacuation dynamics of pedestrians in a square room with one exit, utilizing a static floor field model and game theoretical framework. It explores how self-interest among pedestrians can either positively or negatively impact evacuation dynamics, depending on whether it facilitates collective cooperation in the population. Additionally, the study discusses the effects of placing obstacles in front of the exit and the diversity of responses from pedestrians to space competition on evacuation dynamics.
Article
Physics, Multidisciplinary
Hiroki Fujibayashi, Katsuki Kinjo, Genki Nakamine, Shunsaku Kitagawa, Kenji Ishida, Yo Tokunaga, Hironori Sakai, Shinsaku Kambe, Ai Nakamura, Yusei Shimizu, Yoshiya Homma, Dexin Li, Fuminori Honda, Dai Aoki
Summary: In this study, the static and dynamic magnetic properties of the uranium-based superconductor UTe2 were investigated using NMR measurements. The results showed that magnetic fluctuations in different crystalline axes of UTe2 are derived from the nuclear spin-lattice relaxation rate 1/T1. The magnetic fluctuations become anisotropic below 40 K and are determined by the dominant ferromagnetic fluctuations in the two-leg ladder formed by U atoms.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Physics, Multidisciplinary
Petr Opletal, Hironori Sakai, Yoshinori Haga, Yoshifumi Tokiwa, Etsuji Yamamoto, Shinsaku Kambe, Yo Tokunaga
Summary: We studied the physical properties of a single crystal of uranium telluride U7Te12. It was found that U7Te12 crystallizes in a hexagonal structure with three different crystallographic uranium sites. The paramagnetic moments were estimated to be approximately 1 µB per uranium site assuming a uniform moment on all the sites. A ferromagnetic phase transition occurred at TC = 48 K, with a sharp increase in in-plane magnetization while the out-of-plane component did not increase significantly. Further below TC under field-cooling conditions, the out-of-plane component increased rapidly around T* = 26 K, while the in-plane component showed little change at T*. Specific heat measurement indicated a crossover suggesting a reorientation of ordering moments or successive magnetic ordering of the multiple uranium sites.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Physics, Multidisciplinary
Hiroki Matsumura, Hiroki Fujibayashi, Katsuki Kinjo, Shunsaku Kitagawa, Kenji Ishida, Yo Tokunaga, Hironori Sakai, Shinsaku Kambe, Ai Nakamura, Yusei Shimizu, Yoshiya Homma, Dexin Li, Fuminori Honda, Dai Aoki
Summary: Spin susceptibility in the superconducting state of uranium-based superconductor UTe2 was measured. The higher-quality sample exhibited a higher Tc and a narrower NMR linewidth compared to the previous sample. A significant reduction in Knight shift along the a axis was observed, which differed from the previous results along the alpha axis. The origin of these differences and the possible implications for the superconducting state were discussed.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Physics, Multidisciplinary
H. Sakai, Y. Tokiwa, P. Opletal, M. Kimata, S. Awaji, T. Sasaki, D. Aoki, S. Kambe, Y. Tokunaga, Y. Haga
Summary: The superconducting phase diagram in uranium ditelluride was investigated using high-quality single crystals under magnetic fields along the hard magnetic b axis. Low-field and high-field superconducting phases with different field-angular dependence were distinguished through electrical resistivity and ac magnetic susceptibility measurements. The crystal quality affected the upper critical field of the low-field superconducting phase, but the H* value at which the high-field superconducting phase appeared remained the same across different crystals. A phase boundary signature was also observed inside the low-field superconducting phase near H*, indicating the presence of an intermediate superconducting phase characterized by small flux pinning forces.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Kota Ishihara, Masaki Roppongi, Masayuki Kobayashi, Kumpei Imamura, Yuta Mizukami, Hironori Sakai, Petr Opletal, Yoshifumi Tokiwa, Yoshinori Haga, Kenichiro Hashimoto, Takasada Shibauchi
Summary: Evidence consistent with chiral B-3u+iA(u) spin-triplet superconductivity in UTe2 is found through magnetic penetration depth measurements.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Katsuki Kinjo, Hiroki Fujibayashi, Hiroki Matsumura, Fumiya Hori, Shunsaku Kitagawa, Kenji Ishida, Yo Tokunaga, Hironori Sakai, Shinsaku Kambe, Ai Nakamura, Yusei Shimizu, Yoshiya Homma, Dexin Li, Fuminori Honda, Dai Aoki
Summary: Recently discovered topological superconductor uranium ditelluride exhibits multiple superconducting phases under different pressures. Nuclear magnetic resonance and ac susceptibility measurements confirm spin-triplet superconductivity in one of the phases and reveal the spin degrees of freedom in uranium ditelluride.
Article
Physics, Multidisciplinary
K. Ishihara, M. Kobayashi, K. Imamura, M. Konczykowski, H. Sakai, P. Opletal, Y. Tokiwa, Y. Haga, K. Hashimoto, T. Shibauchi
Summary: The exotic superconducting properties of the paramagnetic spin-triplet superconductor candidate UTe2, such as extremely high upper critical field and possible chiral superconducting states, have attracted significant attention. This study focuses on the thermodynamic critical field Hc, the lower critical field Hc1, and the upper critical field Hc2 at low fields of ultraclean single crystals of UTe2, providing crucial insight into its intrinsic superconducting properties. Anomalous enhancement of Hc1 values with magnetic field along the b and c axes, showing unusual low-temperature upturns, is attributed to the effect of strong Ising-like ferromagnetic fluctuations on the vortex line energy.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
K. Kinjo, H. Fujibayashi, S. Kitagawa, K. Ishida, Y. Tokunaga, H. Sakai, S. Kambe, A. Nakamura, Y. Shimizu, Y. Homma, D. X. Li, F. Honda, D. Aoki, K. Hiraki, M. Kimata, T. Sasaki
Summary: UTe2 is a recently discovered spin-triplet superconductor with a magnetic field (H)-boosted superconductivity >16 T when H is applied exactly parallel to the b axis. The high-H superconducting (HHSC) phase of UTe2 has not been thoroughly investigated, and its SC properties as well as the spin state are not well understood. In this study, AC magnetic susceptibility and nuclear magnetic resonance measurements were performed, revealing that the HHSC state has bulk nature and is sensitive to the H angle, with different SC character compared to the low-H superconducting (LHSC) state. The dominant spin component of the spin-triplet pair also changes from the LHSC state (along the a axis) to the HHSC state (along the b axis). Our findings suggest that the H-induced multiple SC states originate from the remaining spin degrees of freedom.
Article
Materials Science, Multidisciplinary
Yukiharu Takeda, Jiri Pospisil, Hiroshi Yamagami, Etsuji Yamamoto, Yoshinori Haga
Summary: The element-specific electronic states and magnetic properties of UCoGe and Ru-substituted U(Co0.88Ru0.12)Ge were investigated using soft x-ray magnetic circular dichroism experiments. The results show that the Co 3d electrons play an important role in these compounds.
Article
Materials Science, Multidisciplinary
Ikuto Kawasaki, Kazuharu Takeuchi, Shin-ichi Fujimori, Yukiharu Takeda, Hiroshi Yamagami, Etsuji Yamamoto, Yoshinori Haga
Summary: Angle-resolved photoemission spectroscopy (ARPES) experiments were performed to investigate the electronic structure of the heavy-fermion superconductor UPt3. The band structure of UPt3 was compared with density-functional calculations for ThPt3, and it was found that ThPt3 calculations provided a better description of the experimental band structure except for the heavy quasiparticle bands derived from 5f orbitals. The heavy quasiparticle bands were found to be renormalized by electron correlation effects and showed little temperature dependence.
