Article
Physics, Applied
K. Motla, S. Jangid, P. K. Meena, R. K. Kushwaha, R. P. Singh
Summary: Superconducting high-entropy alloys (HEAs) are a newly burgeoning field of unconventional superconductors. In this study, we have synthesized and investigated the superconducting characteristics of two new transition elements based HEAs. The results confirm bulk type-II superconductivity in both alloys, and specific heat analysis supports the Bardeen-Cooper-Schrieffer explanation for the observed low-temperature behavior.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Christina M. Tonauer, Keishiro Yamashita, Leonardo del Rosso, Milva Celli, Thomas Loerting
Summary: Recently, the preparation of pure cubic ice without hexagonal stacking faults has been achieved. A calorimetric study on the transition from pure cubic ice to hexagonal ice has clarified the value of the enthalpy change and identified the transition temperature.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Crystallography
Masoud Tahani, Eligiusz Postek, Tomasz Sadowski
Summary: This study investigates the interdiffusion at the SiC/Al interface using molecular dynamics simulations. The average main and cross-interdiffusion coefficients are evaluated for different samples and the effects of temperature and annealing time are analyzed. The results show that the interdiffusion of Al in SiC is similar in both cubic and hexagonal SiC, and the coefficient increases with higher temperature and longer annealing time. The diffusion model can be used to evaluate the overall mechanical properties of the interface region in future studies.
Article
Engineering, Environmental
Hongping Li, Hongshun Ran, Yujun Li, Naixia Lv, Jie Yin, Jinrui Zhang, Chao Wang, Wei Jiang, Wenshuai Zhu, Huaming Li, Hongbing Ji
Summary: Heteroatom doping is an effective strategy to improve adsorbents' performance. A comparative study of halogen-doped hexagonal boron nitride materials using DFT and quantum analytic methods shows that the doping stability is related to specific sites with edge_B being the most stable. Higher content of halogen-doped h-BN also leads to improved desulfurization performance due to additional X...H-C hydrogen bonding interactions while maintaining pi-pi interactions.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Kuoyi Zhu, Mingji Li, Cuiping Li, Xiuwei Xuan, Hongji Li
Summary: The study developed a flexible aqueous asymmetric capacitor using SiC-BGr cathode and core-shell SiC@Gr anode, demonstrating good capacitance performance in an aqueous NaOH solution. The device exhibited high working voltage, excellent capacitance, cycling stability, and applicability at low temperatures.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Yifeng Zhang, Shuo Zhang, Haorong Sun, Zhe Wang, Feixue Gao, Jiawei Zhang, Zezheng Liu, Ming Fang, Xiaoli Tan, Xiangke Wang
Summary: Photocatalytic U(VI) extraction using O-doped hexagonal-cubic CdS phase heterojunction is an effective method for extracting uranium from water bodies, with CdS-350 showing the best photocatalytic activity. The extraction process involves two steps: photoelectrons reducing U(VI) to U(IV) and photoholes oxidizing U(IV) to insoluble U(VI). CdS-350 demonstrates good recycling performance with only 8% decrease in performance after four cycles.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Materials Science, Ceramics
Dengsheng Ji, Qin Ouyang, Yanfei Wang, Heng Wang, Hongze Liang, Liu He, Qing Huang
Summary: Flexible and thermal stable SiC fiber mats were prepared from boron-doped polyaluminocarbosilane (PACS) precursor by electro-spinning, curing, and pyrolysis. Two boron-containing compounds, o-carborane (oCB) and phenylboronic acid (PBA), were used as boron sources, and their effects on the properties and structure of the SiC fiber mats were investigated.
CERAMICS INTERNATIONAL
(2023)
Article
Crystallography
Xiaoling Shen, Hanming Ma, Dilip Bhoi, Jun Gouchi, Yoshiya Uwatoko, Alisha Dalan, Yukihiro Kawamura, Hiroyasu Sato, Izuru Umehara, Masatomo Uehara
Summary: CeZn undergoes a paramagnetic to antiferromagnetic transition around 30K with a concurrent structural transition from cubic to tetragonal structure. With increasing pressure, the AFM order changes to FM above 1.0GPa, and further pressure leads to a nonmagnetic state above 3.0GPa, where superconductivity is observed at T-sc around 1.3K.
Article
Engineering, Environmental
Ying Li, Dongyue Gao, Shihui Zhao, Yupeng Xiao, Zhonglu Guo, Yi Fang, Jing Lin, Zhenya Liu, Yang Huang, Kai Guo, Chengchun Tang
Summary: The study finds that carbon-doped hexagonal boron nitride nanoribbons (BNNR) can effectively enhance the catalytic performance of nitrogen reduction reaction, reduce the overpotential of NRR reaction, and selectively modulate the adsorption free energy of NRR intermediates without affecting the activation ability of pristine BNNR.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Physics, Multidisciplinary
Isaias G. de Oliveira, Leonardo R. Cadorim, Antonio R. de C. Romaguera, Edson Sardella, Rodolpho R. Gomes, Mauro M. Doria
Summary: The spike state in mesoscopic type I superconductors is confined to a specific field range and undergoes a process of deformation after creation. Its lifetime is in the nanosecond scale and it is a non-equilibrium vortex state, showing dynamic evolution over time.
Article
Chemistry, Physical
Tihomir Knezevic, Eva Jelavic, Yuichi Yamazaki, Takeshi Ohshima, Takahiro Makino, Ivana Capan
Summary: In this study, boron-related defects in low-doped n-type 4H-SiC semitransparent Schottky barrier diodes (SBDs) were investigated using minority carrier transient spectroscopy (MCTS). Boron, introduced during chemical vapor deposition (CVD) crystal growth, led to the presence of shallow (B) and deep boron (D-center) defects, with concentrations as high as 1 x 10(15) cm(-3). Despite the higher concentration of boron compared to nitrogen doping, the steady-state electrical characteristics of the n-type 4H-SiC SBDs remained unaffected.
Article
Chemistry, Physical
Sung Jun Hong, Hoje Chun, Choah Kwon, Byungchan Han
Summary: This study explores the superior thermoelectric properties of a hexagonal SiGe compound compared to its cubic counterpart, revealing that the differences in electronic band structure and phonon vibrational modes are the main factors contributing to the enhanced performance. Based on these findings, hexagonal SiGe is proposed as a promising material for highly active n-type thermoelectric applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Abhijit Biswas, Rui Xu, Joyce Christiansen-Salameh, Eugene Jeong, Gustavo A. Alvarez, Chenxi Li, Anand B. Puthirath, Bin Gao, Arushi Garg, Tia Gray, Harikishan Kannan, Xiang Zhang, Jacob Elkins, Tymofii S. Pieshkov, Robert Vajtai, A. Glen Birdwell, Mahesh R. Neupane, Bradford B. Pate, Tony Ivanov, Elias J. Garratt, Pengcheng Dai, Hanyu Zhu, Zhiting Tian, Pulickel M. Ajayan
Summary: In this research, the phase stability of 2D/3D h-BN/c-BN nanocomposites is investigated, showing that the coexistence of the two phases can result in strong nonlinear optical properties and low thermal conductivity at room temperature. Spark-plasma sintering of the nanocomposites demonstrates complete phase transformation to 2D h-BN with improved crystalline quality, where the nucleation and growth kinetics are possibly governed by 3D c-BN. These findings provide insights into phase engineering of BN polymorph-based nanocomposites with desirable properties for optoelectronics and thermal energy management applications.
Article
Materials Science, Multidisciplinary
Vrushali Yogesh Bhalerao, Sanjay Shridhar Lakade
Summary: This paper focuses on improving the surface properties of bearing-steel materials by impregnating them with cubic and hexagonal boron nitride nanoparticles. The study utilizes vacuum heat treatment and the Taguchi method for optimizing parameters such as nanoparticle weight percentage and treatment temperature. The results show that nanoparticle impregnation can enhance microhardness, improve wear resistance, and reduce frictional force.
Article
Crystallography
Qiang Li, Qifan Zhang, Ransheng Chen, Haoran Zhang, Mingdi Wang, Jingping Zhu, Xiaoliang Wang, Yuhuai Liu, Feng Yun
Summary: Fe-doped hBN films with 2-inch wafer scale were successfully fabricated in this study. Although the crystal quality decreased, the electrical performance was greatly improved. The Fe-doped films retained the characteristics of hBN and exhibited a higher absorption wavelength and optical band gap.
Article
Nanoscience & Nanotechnology
M. Ohno, M. Uchida, Y. Nakazawa, S. Sato, M. Kriener, A. Miyake, M. Tokunaga, Y. Taguchi, M. Kawasaki
Summary: This study successfully synthesized EuCdSb2 thin films with the largest B-site ionic radius, revealing its crystal structure and magnetic properties. This achievement paves the way for further exploration of novel Dirac materials using film techniques.
Article
Multidisciplinary Sciences
D. Maryenko, M. Kawamura, A. Ernst, V. K. Dugaev, E. Ya Sherman, M. Kriener, M. S. Bahramy, Y. Kozuka, M. Kawasaki
Summary: Spin-orbit coupling (SOC) is crucial for spin-dependent phenomena in solids; SOC can compete with Coulomb interaction and lead to unconventional electronic phases; Tuning carrier density in a two-dimensional electron system at a MgZnO/ZnO interface demonstrates interplay between SOC and electron-electron interaction, paving way for emergent spintronic phenomena.
NATURE COMMUNICATIONS
(2021)
Correction
Nanoscience & Nanotechnology
Ohno, M. Uchida, Y. Nakazawa, S. Sato, M. Kriener, A. Miyake, M. Tokunaga, Y. Taguchi, M. Kawasaki
Article
Materials Science, Multidisciplinary
J. Fujioka, M. Kriener, D. Hashizume, Y. Yamasaki, Y. Taguchi, Y. Tokura
Summary: Manipulating band inversion by alloying Cd3As2 with Zn3As2 can enhance the thermoelectric figure of merit and suppress thermal conductivity, leading to the emergence of a band structure with partly flat dispersion in the higher-x region of Cd3-xZnxAs2.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Physics, Multidisciplinary
Minoru Soda, Nao Kagamida, Sebastian Muhlbauer, Edward M. Forgan, Emma Campillo, Markus Kriener, Hideki Yoshizawa, Hazuki Kawano-Furukawa
Summary: Specific heat and small-angle neutron scattering measurements were conducted on the superconductor fi-PdBi2, revealing momentum-dependent gap anisotropy and an increasing ratio of two gap parameters with increasing magnetic field. Fits to a model with two gap parameters provided a better description of the data compared to models with a uniform gap.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2021)
Article
Multidisciplinary Sciences
A. Devarakonda, T. Suzuki, S. Fang, J. Zhu, D. Graf, M. Kriener, L. Fu, E. Kaxiras, J. G. Checkelsky
Summary: This study investigates thermodynamic signatures of bosonic Landau level transitions in a layered superconductor, where Cooper pairs with finite momentum are formed. The observations indicate distinct vortex states and modulations in the upper critical magnetic field, in agreement with predictions for Cooper pair Landau level transitions in a finite-momentum superconductor.
Article
Multidisciplinary Sciences
Cheng-Long Zhang, Tian Liang, M. S. Bahramy, Naoki Ogawa, Vilmos Kocsis, Kentaro Ueda, Yoshio Kaneko, Markus Kriener, Yoshinori Tokura
Summary: The study introduces a ferroelectric nonmagnetic Weyl semimetal based on indium-doped Pb1-xSnxTe alloy, with adjustable ferroelectric strength by tuning the indium doping level and Sn/Pb ratio. Utilizing the Nernst effect under magnetic fields as an experimental probe, it demonstrates the generation of Berry curvature through the redistribution of Weyl nodes.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Materials Science, Multidisciplinary
Atsunori Doi, Satoshi Shimano, Markus Kriener, Akiko Kikkawa, Yasujiro Taguchi, Yoshinori Tokura
Summary: The thermal conductivity above room temperature is investigated for LaCoO3-based materials showing spin-state and insulator-metal crossovers. It is observed that the thermal conductivity exhibits a positive temperature coefficient during the insulator-metal crossover, and both electronic and phononic contributions enhance the thermal transport. Additionally, the tunability of the thermal conductivity is demonstrated via doping in hole-type carriers, and the enhancement ratio reaches a large value among oxide materials.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Keisuke Matsuura, Yo Nishizawa, Markus Kriener, Takashi Kurumaji, Hiroshi Oike, Yoshinori Tokura, Fumitaka Kagawa
Summary: In some materials, the equilibrium phase-transition line is concealed by the hysteresis region associated with field-induced first-order transitions (FOTs). Phase diagrams are essential in material science, as they provide comprehensive information about thermodynamic quantities. However, determining the equilibrium phase-transition line in a field-induced FOT is challenging, especially in the presence of large hysteresis.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
Kentaro Ueda, Tonghua Yu, Motoaki Hirayama, Ryo Kurokawa, Taro Nakajima, Hiraku Saito, Markus Kriener, Manabu Hoshino, Daisuke Hashizume, Taka-hisa Arima, Ryotaro Arita, Yoshinori Tokura
Summary: This study investigates the less studied half-Heusler alloy HoAuSn and demonstrates its transition into a Weyl semimetal state under a magnetic field, resulting in a significant decrease in resistance.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
M. Kriener, M. S. Bahramy, Y. Tokura, Y. Taguchi
Summary: This study investigates the changes in the superconducting temperature in InxTe by fine-tuning the stoichiometry of indium. The results show that increasing the indium content leads to an enhancement in the superconducting temperature and the electron-phonon coupling constant. First-principles calculations reveal that this behavior is driven by two factors, with different factors dominating depending on the indium content.
Article
Materials Science, Multidisciplinary
Bruno Gudac, Markus Kriener, Yuriy Sharlai, Mihovil Bosnar, Filip Orbanie, Grigorii P. Mikitik, Akio Kimura, Ivan Kokanovic, Mario Novak
Summary: We demonstrate a unique approach to test the signature of the nodal-line physics by thermodynamic methods. By measuring magnetic susceptibility in ZrSiS, we found an intriguing temperature-driven crossover from paramagnetic behavior. The anomalous behavior represents a real thermodynamic signature of the underlying nodal-line physics, which can be verified through chemical pressure, quantum oscillations, and theoretical modeling. The results in ZrSiS provide a starting point for exploring other nodal-line physics-related phenomena in other materials using thermodynamic methods.
Article
Materials Science, Multidisciplinary
Kentaro Ueda, Hiroaki Ishizuka, Markus Kriener, Shunsuke Kitou, Denis Maryenko, Minoru Kawamura, Taka-hisa Arima, Masashi Kawasaki, Yoshinori Tokura
Summary: We report experimental signatures of topological transitions among the Weyl semimetal states of pyrochlore Pr2Ir2O7, where the Kondo coupling between the Jr topological electrons and the spin-ice-like orders of Pr moments plays a decisive role. The magnetic-field dependence of resistivity and the Hall conductivity exhibits a plateau and a sharp jump associated with a magnetic-field hysteresis, similar to a liquid-gas-like transition in a dipolar spin-ice system. Furthermore, the Kondo coupling is controlled by hydrostatic pressure, revealing that the field-induced displacement of Weyl points in the momentum space strongly depends on the respective electronic state as well as on the Kondo coupling strength. These observations pave a route toward the engineering of band topology in hybrid quantum materials with relativistic conduction electrons and localized magnetic moments.
Article
Materials Science, Multidisciplinary
Mizuki Ohno, Susumu Minami, Yusuke Nakazawa, Shin Sato, Markus Kriener, Ryotaro Arita, Masashi Kawasaki, Masaki Uchida
Summary: The EuCd2Sb2 single-crystalline films provide a platform for controlling the intrinsic anomalous Hall effect (AHE), which shows clear energy dependence as demonstrated by experimental results and first-principles calculations.
Article
Materials Science, Multidisciplinary
Mizuki Ohno, Masaki Uchida, Ryosuke Kurihara, Susumu Minami, Yusuke Nakazawa, Shin Sato, Markus Kriener, Motoaki Hirayama, Atsushi Miyake, Yasujiro Taguchi, Ryotaro Arita, Masashi Tokunaga, Masashi Kawasaki
Summary: We report the fabrication of EuSb2 single-crystalline films and investigation of their quantum transport. The first-principles calculations reveal that EuSb2 is a magnetic topological nodal-line semimetal protected by nonsymmorphic symmetry. The observed Shubnikov-de Haas oscillations with multiple frequency components suggest the presence of small effective masses and two-dimensional field-angle dependence, indicating possible contributions of surface states even in a 250 nm thick film. This finding of a high-mobility magnetic topological semimetal will stimulate further research in exotic quantum transport phenomena by manipulating magnetic order in topological semimetal films.
