Article
Chemistry, Physical
Mikhail Mazuritskiy, Alexey T. Kozakov, Niranjan Kumar, Ruslan M. Smertin, Sergei A. Garakhin, Vladimir N. Polkovnikov, Nikolay Chkhalo
Summary: This study investigates multilayer interference structures based on Mo/Si and W/Si using laboratory X-ray micro-fluorescence analysis and statistical analysis. The degree of homogeneity and chemical compositions of the multilayer mirrors are evaluated using X-ray spectroscopy and mathematical statistics. A correlation between the statistical characteristics of bimodal frequency distribution and the reflectivity properties of X-ray mirrors for scattered radiation is revealed.
SURFACES AND INTERFACES
(2022)
Article
Multidisciplinary Sciences
J. Niskanen, A. Vladyka, J. Niemi, C. J. Sahle
Summary: In this study, we explore the sensitivity of several core-level spectroscopic methods to the atomistic structure using water molecule as a test system. We define a metric to measure the magnitude of spectral change as a function of structure, which enables us to identify structural regions with high spectral sensitivity. By employing machine-learning emulator-based decomposition of structural parameter space, we are able to recover more spectral variance and identify spectroscopically dominant degrees of freedom.
ROYAL SOCIETY OPEN SCIENCE
(2022)
Article
Chemistry, Physical
Maxim K. Rabchinskii, Svyatoslav D. Saveliev, Dina Yu. Stolyarova, Maria Brzhezinskaya, Demid A. Kirilenko, Marina Baidakova, Sergei A. Ryzhkov, Vladimir V. Shnitov, Victor V. Sysoev, Pavel N. Brunkov
Summary: This study demonstrates the modulation of N species by tailoring the functionalization and atomic structure of graphene derivatives prior to chemical N-doping. Thermal annealing at moderate temperatures was shown to readjust the composition of N-species in graphene derivatives regardless of their chemistry, nanostructure, and the initial distribution of the N-species. The oxidation of the graphene layer governs the manifestation of pi* resonances and configuration of sigma* resonance.
Article
Materials Science, Ceramics
Zhichao Song, Jun Zhang, Yan Wang, Jianping Li
Summary: SnO2 nanomaterials and SnO2/Li2SnO3 composite nanomaterials doped with different Li contents were synthesized via a one-step thermal evaporation method. The increase of Li doping resulted in changes in the structure and properties, as observed in X-ray diffraction, Raman scattering, and X-ray photoelectron spectroscopy.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Alexey T. Kozakov, Niranjan Kumar, Sergei A. Garakhin, Vladimir N. Polkovnikov, Nikolay Chkhalo, Anatoly Nikolskii, Anton A. Scrjabin, Aleksey Nezhdanov, Pavel A. Yunin
Summary: The study investigated the thickness-dependent shift of energy position and fine structure of plasmons in the upper layer of silicon and tungsten in W/Si and Si/W multilayer mirrors using X-ray photoelectron spectroscopy. The results showed that plasmon excitation energy and intensity varied with the thickness of Si and W layers, with different behaviors along different interfaces. The reflection intensity of the mirrors was found to be higher for lower values of plasmons excitation intensity.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Ceramics
Pavel V. Krasovskii, Alexey M. Lebedev
Summary: The surface chemistry of a plasma SiC nanopowder was characterized using X-ray photoelectron spectroscopy. The results showed surface enrichment of silica and sp2-bonded elemental carbon, with varying oxidation depths.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Raju Kumar, R. N. Bhowmik, A. K. Sinha
Summary: The doping effects of a small amount of RE (Gd and Ho) atoms in La2NiMnO6 double perovskite have been studied. Doping affects the magnetic properties, and factors such as structural phase components and anti-site disorder of Mn/Ni ions also play a role in determining the magnetic properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nuclear Science & Technology
Ze-Hua Yang, Jing-Tao Zhu, Zhong-Liang Li, Hong-Xin Luo, Shang-Yu Si, Yun-Ping Zhu, Li Zhao, Kuan Ren, Feng Wang, Rong-Qing Yi
Summary: In this study, aperiodic Mo/B4C multilayer mirrors were optimized for X-ray plasma diagnostics, achieving a narrow bandwidth and consistent spectral response. The short-term thermal stability of the multilayer was evaluated through temperature-dependent reflectivity measurements.
NUCLEAR SCIENCE AND TECHNIQUES
(2023)
Review
Metallurgy & Metallurgical Engineering
Youhong Peng, Kesong Miao, Wei Sun, Chenglu Liu, Hao Wu, Lin Geng, Guohua Fan
Summary: Characterizing the microstructure and deformation mechanism of metallic materials is crucial for understanding the microstructure-property relationship. Advanced synchrotron radiation facilities have enabled non-destructive visualization of full-field structural information in three dimensions, contributing to significant progress in recent decades. Future innovations in next-generation synchrotron radiation and emerging technologies hold great potential for further advancements in material characterization.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Chemistry, Physical
Marcus Johansen, Christoph Schlueter, Pui Lam Tam, Leif E. Asp, Fang Liu
Summary: The study revealed the three-dimensional spatial distribution and chemical states of nitrogen in three types of PAN carbon fibers, and correlated the results with electrochemical performance, providing a pathway for future tailoring of carbon fiber microstructure for multifunctional applications.
Article
Nanoscience & Nanotechnology
Ruoxin Fan, Baozhi Wang, Yigui Li, Liyan Lai
Summary: Nano-gratings with high structural accuracy and aspect ratio were prepared using synchrotron radiation by optimizing the experimental conditions. The optimal exposure dose and development time were determined by observing surface loss and roughness. The controlled variables experimental method helped achieve the desired rectangular grating structure.
Article
Chemistry, Physical
Biswajyoti Mohanty, Anamitra Chattopadhyay, Jhasaketan Nayak
Summary: Combining PbS with CeO2 can reduce the band gap of CeO2 and enhance electrical conductivity. CeO2 PbS nanocomposites were synthesized at different concentrations of Pb precursor and characterized for morphology and structure, showing potential for optoelectronic devices and solar cell applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Optics
Yu Wang, Peng Peng Zhang, Lan Luo, Xing Tao Chen, Rui Guo, Jing Yi Xu
Summary: This paper investigates the effects of Lu3+ ion doping on the structure and photoluminescent properties of Ba2SiO4:Eu2+ phosphors. It is found that Lu3+ ions can enhance the conversion of Eu3+ to Eu2+, leading to improved luminescence performance.
JOURNAL OF LUMINESCENCE
(2021)
Article
Chemistry, Physical
Teodor I. Milenov, Dimitar A. Dimov, Ivalina A. Avramova, Stefan K. Kolev, Dimitar V. Trifonov, Georgi V. Avdeev, Daniela B. Karashanova, Biliana C. Georgieva, Kamen V. Ivanov, Evgenia P. Valcheva
Summary: This study focuses on the evaluation of the influence of chemical treatment on the structure and morphology of carbon phases. The chemical interactions of two types of graphite and carbon black with acetone, toluene, and phenol were studied. Experimental and theoretical methods were used to determine the chemical and phase composition, as well as the morphology and structure. The findings suggest that the treatment of graphite powders and carbon black with acetone, toluene, or phenol can be an effective preliminary stage for their modification and conversion into graphene-like phases.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Jacob N. Vagott, Kathryn Bairley, Juanita Hidalgo, Carlo A. R. Perini, Andres-Felipe Castro-Mendez, Sarah Lombardo, Barry Lai, Lihua Zhang, Kim Kisslinger, Josh Kacher, Juan-Pablo Correa-Baena
Summary: Atomic layer deposition (ALD) allows precise control over the thickness, stoichiometry, and structural defects of materials. This study deposited lead iodide (PbI2) using a facile ALD process with readily accessible and low-cost precursors. The deposited PbI2 was characterized using various techniques and lays the foundation for further development of lead halide perovskite processes by ALD.
CHEMISTRY OF MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Hideki Kawaguchi, Takumi Muramatsu, Masahiro Katoh, Masahito Hosaka, Yoshifumi Takashima
Summary: This paper investigates the application of pulsed multipole magnet beam injectors in synchrotron radiation facilities and identifies serious beam disturbance caused by the developed beam injector. The induced eddy current on the titanium layer is quantitatively evaluated through numerical simulations and improvement measures are discussed based on the simulation results.
IEICE TRANSACTIONS ON ELECTRONICS
(2022)
Article
Multidisciplinary Sciences
T. Kaneyasu, M. Hosaka, A. Mano, Y. Takashima, M. Fujimoto, E. Salehi, H. Iwayama, Y. Hikosaka, M. Katoh
Summary: This study verifies that spontaneous radiation wave packets generated by tandem undulators have a double-pulsed temporal profile, which can be controlled at the attosecond level.
SCIENTIFIC REPORTS
(2022)
Review
Chemistry, Physical
Yoshiyuki Ohtsubo, Shin-ichi Kimura, Fumitoshi Iga
Summary: This article reviews the peculiar metallic electronic states proposed and observed in Kondo insulators, and the importance of topological Kondo insulators. The controversial conclusions from experimental studies of these states are mainly due to the difficulty and inhomogeneity of the single crystal surfaces of the TKI candidates. Recent progress in forming homogeneous and well-defined clean surfaces has provided a better understanding of the surface electronic states in SmB6 and YbB12.
ELECTRONIC STRUCTURE
(2022)
Article
Physics, Applied
Bowen Qiang, Takeru Fukasawa, Tetsuya Hajiri, Takahiro Ito, Takehiko Hihara, Hidefumi Asano
Summary: The magnetic phase diagram and topological Hall effect (THE) of Co2-xPdxMo3N thin films were studied using magnetization and transport measurements. The research reveals a rich phase diagram in the temperature versus Pd content x plane, with different magnetic behaviors and a low-temperature phase found in different regions. Particularly, a prominent topological Hall effect was observed in films with certain Pd content.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Multidisciplinary Sciences
Yoshiyuki Ohtsubo, Toru Nakaya, Takuto Nakamura, Patrick Le Fevre, Francois Bertran, Fumitoshi Iga, Shin-Ichi Kimura
Summary: The breakdown of in-plane rotation symmetry in topological surface states (TSSs) of SmB6 is shown to be related to the importance of surface atomic structure. Experimentally, it is found that TSSs are anisotropic and lack the fourfold rotation symmetry observed in the bulk on the SmB6(001)-p(2 x 2) surface. These results suggest that engineering the surface atomic structure could provide a new pathway to tailor various properties of TSSs.
NATURE COMMUNICATIONS
(2022)
Article
Crystallography
Hidetoshi Miyazaki, Shin-ichi Kimura, Kensuke Onishi, Takehiko Hihara, Masato Yoshimura, Hirofumi Ishii, Masashi Mikami, Yoichi Nishino
Summary: This study investigates the thermoelectric conversion properties of Heusler-type Ru2VAl, a candidate material for next-generation thermoelectric conversion, through first-principle calculations and direct experimental observations. The results show that Ru2VAl has a wider pseudogap near the Fermi level compared to Fe2VAl, indicating a higher thermoelectric conversion performance at higher temperatures.
Article
Materials Science, Multidisciplinary
Tomo-o Terasawa, Kazuya Matsunaga, Naoki Hayashi, Takahiro Ito, Shin-ichiro Tanaka, Satoshi Yasuda, Hidehito Asaoka
Summary: This study presents angle-resolved photoemission spectroscopy and density functional calculation of graphene on a Hex-Au(001) surface. It is found that hybridization between graphene and gold leads to the generation of a bandgap and potential spin injection. The one-dimensional potential of graphene is too small to modify its electronic structure, but a bandgap of 0.2 eV is observed at the crossing point of graphene pi and Au 6sp bands.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Physics, Multidisciplinary
Hojun Im, Masataka Iwataki, Masanori Tsunekawa, Takao Watanabe, Hitoshi Sato, Masashi Nakatake, Shin-ichi Kimura
Summary: We have studied the strong correlation effects in A-site ordered perovskites CaCu3Ti4-xRuxO12 (x = 0, 1, 3.5, and 4) using photoemission and inverse photoemission spectroscopies. The peak positions of the strongly correlated Cu 3d and Ti 3d states remain relatively unchanged in x = 0, 1, 3.5, indicating the role of Ti in retaining the strong correlation effects. However, in x = 4, the Cu 3d states split into two peaks. In addition, the localized character of Cu 3d states weakens as Ru increases, and the metal-insulator transition between x = 1 and 3.5 is observed.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Physics, Multidisciplinary
Shin-ichi Kimura, Hiroshi Watanabe, Shingo Tatsukawa, Hiroshi Tanida
Summary: CeCoSi with no local inversion symmetric crystal structure (P4/nmm) undergoes a phase transition of unknown origin (Hidden Order: HO) at around 12K (T-0) above the antiferromagnetic transition temperature (T-N = 9.4 K). Using high-precision optical reflection spectroscopy, the change in electronic structure across T-0 was investigated. The optical spectrum transformed from a typical metallic behavior above T-0 to a gap-like structure at around 15 meV below T-0.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Nanoscience & Nanotechnology
B. W. Qiang, T. Fukasawa, T. Hajiri, T. Ito, T. Hihara, H. Asano
Summary: In this study, Hall transport and non-collinear magnetoresistance (NCMR) were investigated for a chiral antiferromagnet with the filled beta-Mn-type structure. It was found that epitaxial thin films of Co2-xPdxMo3N exhibited canted antiferromagnetic behavior above room temperature, but thin films with x = 1.01 to 1.38 underwent a transition to a spin spiral state with a higher magnetic moment at lower temperatures. The low-temperature phase showed large anomalous Hall effect (AHE) and topological Hall effect (THE), indicating the formation of topological spin textures.
Article
Materials Science, Multidisciplinary
Takuto Nakamura, Toru Nakaya, Yoshiyuki Ohtsubo, Hiroki Sugihara, Kiyohisa Tanaka, Ryu Yukawa, Miho Kitamura, Hiroshi Kumigashira, Keiichiro Imura, Hiroyuki S. Suzuki, Noriaki K. Sato, Shin-ichi Kimura
Summary: The electronic structure changes on the SmS surface under K doping are investigated using core-level photoelectron spectroscopy and angle-resolved photoelectron spectroscopy. The results show that the mean valence of Sm on the surface increases from nearly divalent to trivalent states with increasing K deposition. This carrier-induced valence transition (CIVT) from Sm2+ to Sm3+ is opposite to the conventional electron doping. The excess electrons from K atoms transfer to S sites, and the liberated electrons from Sm3+ ions due to CIVT are trapped around the Sm3+ ions like local excitons.
Article
Nanoscience & Nanotechnology
Hidetoshi Miyazaki, Tetsuya Hajiri, Masaharu Matsunami, Manabu Inukai, Takahiro Ito, Shin-ichi Kimura
Summary: The electronic structure, exchange splitting energy (Delta E-EX), and ferromagnetic phase transition temperature (T-C) of single-crystalline EuO (100) ultrathin films were studied using temperature- and thickness-dependent angle-resolved photoemission spectroscopy. It was found that both Delta E-EX and T-C decreased as the film thickness decreased. The band shift showed opposite thickness dependencies at the Gamma and X points, indicating the balance between hybridization of Eu 4f and O 2p states (super-exchange interaction) and that of Eu 4f, O 2p, and Eu 5d states (indirect-exchange interaction). The transition from an indirect energy gap in bulk EuO to a direct gap in ultrathin films of ferromagnetic semiconductor EuO could have potential applications in future spintronic devices.
FRONTIERS IN NANOTECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Takuto Nakamura, Yoshiyuki Ohtsubo, Ayumi Harasawa, Koichiro Yaji, Shik Shin, Fumio Komori, Shin-ichi Kimura
Summary: In this study, the spin-orbit texture in a surface Rashba system on Bi/InAs(110)-(2 x 1) was investigated, revealing odd fluctuations in the spin polarization and unexpected freedom for spin manipulation.
Article
Materials Science, Multidisciplinary
Shin-ichi Kimura, Jorg Sichelschmidt, Seunghyun Khim
Summary: The electronic structures of heavy-fermion superconductor CeRh2As2 and reference material LaRh2As2 were investigated using experimental optical conductivity spectra and first-principles density functional theory calculations. In CeRh2As2, two mid-IR peaks corresponding to the unoccupied Ce 4f(5/2) and 4f(7/2) states were strongly developed with decreasing temperature, suggesting the emergence of hybridization states between conduction and 4f electrons.
