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Anisotropic and mutable magnetization in Kondo lattice CeSb2

Chinese Physics B 2017年第6期26卷 319-323页

作者：张云朱燮刚胡丙锋谭世勇谢东华冯卫刘琴张文刘瑜宋海峰罗丽珠张政军赖新春 Science and Technology on Surface Physics and Chemistry Laboratory Department of Engineering Physics Tsinghua University Key Laboratory of Neutron Physics Institute of Nuclear Physics and ChemistryChina Academy of Engineering Physics Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Software Center for High Performance Numerical Simulation China Academy of Engineering Physics Key Laboratory of Advanced Materials (MOE) School of Materials Science and EngineeringTsinghua University

We have systematically studied the behaviors of the resistivity and magnetization of CeSb2 single crystals as a function of temperature and external field. Four anomalies in the resistivity/magnetization-versus-temperature curves are observed at low magnetic field. They are located at 15.5 K, 11.5 K, 9.5 K, and 6.5 K, corresponding to the paramagnetic–magnetically ordered state（MO）, MO-antiferromagnetic（AFM）, AFM–AFM, and AFM–ferromagnetic（FM） transitions, *** anomaly at 9.5 K is only visible with H‖[010] by magnetic susceptibility measurements, indicating that the AFM–AFM transition only happens along [010] direction in ab-plane. The four magnetic transitions are strongly suppressed by high external field. Finally, the field-temperature phase diagrams of CeSb2 with different orientations of the applied field in ab-plane are constructed and indicate the highly anisotropic nature of the magnetization of CeSb2.

关键词： CeSb2 electronic properties magnetic properties

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Improvement of Grain Boundary Tolerance by Minor Additions of Hf and B in a Second Generation Single Crystal Superalloy

SSRN

引用

SSRN 2018年

作者： Zhao, Yunsong S. Zhang, Jian Luo, Yushi S. Sha, Gang Li, Longfei F. Tang, Dingzhong Z. Feng, Qiang Charles Beijing Advanced Innovation Center for Material Genome Engineering State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing100083 China Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials Beijing100095 China School of Material Science and Engineering

Nowadays, the low angle or high angle grain boundary (LAB or HAB) are difficult to be fully removed from Nickel-based single crystal (SX) superalloys by using the conventional directional solidification technique. The additions of C, B and Hf have been found to be an effective measure in improving the damage resistance of grain boundary (GB), and thus increasing the creep resistance. However, the strengthening mechanism by their additions is still unclear. In this study, a double-seed solidification technique with two levels of misorientation, i.e. 5° and 20°,was used to produce a series of bicrystal superalloys with different content of Hf and B . It is the first report of an alloy with the joint addition of Hf and B, that demonstrates tolerance to GBs with a misorientation as high as 20°under all the creep conditions: 1100 °C/130 MPa, 980 °C/250 MPa and 760 °C/785 MPa. However, the effect of the individual addition of Hf or B was not as pronounced as or even worse than that of the Hf and B joint addition. To understand the influence of Hf and B additions on the creep mechanism in the nickel-based superalloys with GB defects, a detailed characterization of the misorientation-related microstructures at the GBs was carried out and the elemental distribution at the GBs was analyzed. This study will be beneficial for understanding the role of Hf and B additions on improving the GB tolerance, and optimizing the Hf and B additions in nickel-based single crystal superalloys. © 2018, The Authors. All rights reserved.

关键词： Grain boundaries

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Perovskite—A Wonder Material for Photovoltaic and Optoelectronic Applications

Perovskite—A Wonder Material for Photovoltaic and Optoelect...

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2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC)

作者： Shengzhong Frank Liu Yucheng Liu Xuejie Zhu Jiangshan Feng Zhou Yang Kui Zhao Dong Yang Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi’an China

A duel-source co-evaporation technique is developed to fabricate Cs-substituted MA1-xCsxPbI3 perovskite film with superior large area uniformity, solar cell efficiency and stability. Upon optimization of all layers and interfaces, our current status for the rigid thin film cell efficiency is over 21.5% and that for the flexible device over 18.3%, both are among the highest for their respective categories. More importantly, the devices are found showing very good stability over long term exposure in ambient with very low degradation. After a representative cell was exposed in ambient lab condition for a year, its final cell efficiency is as high as over 95% of its initial efficiency with its degradation accounts for only smaller than 5%. Further analysis on the stability of the perovskite solar cells will be discussed.

关键词： Photovoltaic cells Thermal stability Stability analysis Optimization Computer architecture Fabrication Microprocessors

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Quantum tricriticality of incommensurate phase induced by quantum domain walls in frustrated Ising magnetism

arXiv

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arXiv 2020年

作者： Zhou, Zheng Liu, Changle Liu, Dong-Xu Yan, Zheng Chen, Yan Zhang, Xue-Feng Perimeter Institute for Theoretical Physics WaterlooONN2L 2Y5 Canada Department of Physics and State Key Laboratory of Surface Physics Fudan University Shanghai200438 China Department of Physics and Astronomy University of Waterloo WaterlooONN2L 3G1 Canada School of Engineering Dali University Yunnan Dali671003 China Shenzhen Institute for Quantum Science and Technology and Department of Physics Southern University of Science and Technology Shenzhen518055 China Department of Physics Center of Quantum Materials and Devices Chongqing University Chongqing401331 China Chongqing Key Laboratory for Strongly Coupled Physics Chongqing University Chongqing401331 China Department of Physics and HKU-UCAS Joint Institute of Theoretical and Computational Physics The University of Hong Kong Pokfulam Road Hong Kong Beihang Hangzhou Innovation Institute Yuhang Hangzhou310023 China Collaborative Innovation Center of Advanced Microstructures Nanjing210093 China

Incommensurability plays a critical role in many strongly correlated systems. In some cases, the origin of such exotic order can be theoretically understood in the framework of 1d line-like topological excitations known as "quantum strings". Here we study an extended transverse field Ising model on a triangular lattice. Using the large scale quantum Monte Carlo simulations, we find that the spatial anisotropy can stabilize an incommensurate phase out of the commensurate clock order. Our results for the structure factor and the string density exhibit a linear relationship between incommensurate ordering wave vector and the density of quantum strings, which is reminiscent of hole density in under-doped cuprate superconductors. When introducing the next-nearest-neighbor interaction, we observe a quantum tricritical point out of the incommensurate phase. After carefully analyzing the ground state energies within different string topological sectors, we conclude that this tricriticality is non-trivially caused by effective long-range inter-string interactions with two competing terms following different decaying behaviors. Copyright © 2020, The Authors. All rights reserved.

关键词： Monte Carlo methods

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Corrigendum to “Sea urchin-like [email protected] electrocatalysts with high FAOR performance: Coefficient of lattice strain and electrochemical surface area” [Appl. Catal. B: Environ. 260 (2020) 118200/apcatb.2019.118200]

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Applied Catalysis B: Environmental 2020年 269卷

作者： Long Yang Guoqiang Li Jifang Chang Junjie Ge Changpeng Liu Vladimir Fateev Guiling Wang Zhao Jin Wei Xing State Key Laboratory of Electroanalytical Chemistry Laboratory of Advanced Power Sources Changchun Institute of Applied Chemistry Chinese Academy of Sciences Renmin Street No. 5625 Changchun 130022 PR China Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 PR China National Research Center “Kurchatov Institute” 1 Akademika Kurchatova sq. 123182 Moscow Russia

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Magnetic and electronic properties of single-crystalline BaCoSO

arXiv

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arXiv 2019年

作者： Song, Yuanhe Liu, Xianshi Wu, Dong Yao, Qi Wen, Chenhaoping Avdeev, Maxim Peng, Rui Xu, Haichao Miao, Jin Lou, Xia Fang, Yifei Pan, Binglin Wang, Nanlin Peets, Darren C. Feng, Donglai State Key Laboratory of Surface Physics Department of Physics Advanced Materials Laboratory Fudan University Shanghai200438 China International Center for Quantum Materials School of Physics Peking University Beijing100871 China Australian Nuclear Science and Technology Organisation Lucas HeightsNSW2234 Australia Collaborative Innovation Center of Quantum Matter Beijing100871 China Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo Zhejiang315201 China Hefei National Laboratory for Physical Science at Microscale Department of Physics University of Science and Technology of China Hefei Anhui230026 China Collaborative Innovation Center of Advanced Microstructures Nanjing210093 China

Doped BaCoSO was recently predicted to be a high-temperature superconductor in a new class based on Co and Ni. Using a Co–S self flux method, we synthesized single crystals of the antiferromagnetic insulator BaCoSO. Our magnetic and specific heat measurements and neutron diffraction provide details of its magnetic anisotropy and order. Its band gap was determined to be about 1.3 eV by our measurements of its photoemission spectrum and infrared optical conductivity. Our results can pave the way to exploring the predicted superconductivity in this Co-based material. Copyright © 2019, The Authors. All rights reserved.

关键词： Single crystals

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Bidirectional spin-wave-driven domain wall motion in ferrimagnets

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Physical Review B 2019年第17期100卷 174403-174403页

作者： Se-Hyeok Oh Se Kwon Kim Jiang Xiao Kyung-Jin Lee Department of Nano-Semiconductor and Engineering Korea University Seoul 02841 Korea Department of Physics and Astronomy University of Missouri Columbia Missouri 65211 USA Department of Physics and State Key Laboratory of Surface Physics Fudan University Shanghai 200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China Institute for Nanoelectronics Devices and Quantum Computing Fudan University Shanghai 200433 China Department of Materials Science and Engineering Korea University Seoul 02841 Korea KU-KIST Graduate School of Converging Science and Technology Korea University Seoul 02841 Korea

We investigate ferrimagnetic domain-wall dynamics induced by circularly polarized spin waves theoretically and numerically. We find that the direction of domain-wall motion depends on both the circular polarization of spin waves and the sign of net spin density of the ferrimagnet. Below the angular momentum compensation point, left- circularly (right-circularly) polarized spin waves push a domain wall towards (away from) the spin-wave source. Above the angular momentum compensation point, on the other hand, the direction of domain-wall motion is reversed. This bidirectional motion originates from the fact that the sign of spin-wave-induced magnonic torque depends on the circular polarization and the subsequent response of the domain wall to the magnonic torque is governed by the net spin density. Our finding provides a way to utilize a spin wave as a versatile driving force for bidirectional domain-wall motion.

关键词： Domain walls Spin waves Ferrimagnets

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Influence of surgical suture properties on the tribological interactions with artificial skin by a capstan experiment approach

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Friction 2017年第1期5卷 87-98页

作者： Tianhui REN Xiangqiong ZENG Emile VAN DER HEIDE School of Chemistry and Chemical Engineering Key Laboratory for Thin Film and Microfabrication of the Ministry of Education Shanghai Jiao Tong University Shanghai 200240 China Advanced Lubricating Materials Laboratory Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201210 ChinaLaboratory for Surface Technology and Tribology University of Twente Enschede 7500AE the Netherlands Laboratory for Surface Technology and Tribology University of Twente Enschede 7500AE the NetherlandsTU Delft Faculty of Civil Engineering and Geosciences Stevinweg 1 Delft 2628 CN the Netherlands

Tribological interactions between surgical suture and human tissue play an important role in the stitching *** purpose of the paper is to understanding the tribological behavior of surgical suture interacting with artificial skin,with respect to surgical suture material and structure,by means of a capstan experiment approach and a contact area *** results indicated that structure and surface topography of the surgical suture had a pronounced effect on the tribological *** apparent coefficient of friction of vicryl surgical suture was the smallest among the three surgical suture *** the sliding velocity increased,or the applied load decreased,the coefficient of friction ***,stick-slip phenomena were observed during the sliding procedure.

关键词： friction sliding surgical suture artificial skin capstan experiment

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Entanglement entropy, quantum fluctuations, and thermal entropy in topological phases

arXiv

引用

arXiv 2019年

作者： Hu, Yuting Wan, Yidun State Key Laboratory of Surface Physics Fudan University Shanghai200433 China Department of Physics Center for Field Theory and Particle Physics Fudan University Shanghai200433 China Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai200433 China Department of Physics Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China CAS Key Laboratory of Microscale Magnetic Resonance Department of Modern Physics University of Science and Technology of China Hefei Anhui230026 China Collaborative Innovation Center of Advanced Microstructures Nanjing210093 China

Entanglement entropy in topologically ordered matter phases has been computed extensively using various methods. In this paper, we study the entanglement entropy of topological phases in two-spaces from a new perspective-the perspective of quasiparticle fluctuations. In this picture, the entanglement spectrum of a topologically ordered system is identified with the spectrum of quasiparticle fluctuations of the system, and the entanglement entropy measures the maximal quasiparticle fluctuations on the EB. As a consequence, entanglement entropy corresponds to the thermal entropy of the quasiparticles at infinite temperature on the entanglement boundary. We corroborates our results with explicit computation in the quantum double model with/without boundaries. We then systematically construct the reduced density matrices of the quantum double model on generic 2-surfaces with boundaries. Copyright © 2019, The Authors. All rights reserved.

关键词： Entropy

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Correction for "Lysozyme Membranes Promoted by Hydrophobic Substrates for Ultrafast and Precise Organic Solvent Nanofiltration"

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Nano letters 2021年第4期21卷 1902页

作者： Ming-Bang Wu Facui Yang Jing Yang Qi Zhong Volker Körstgens Peng Yang Peter Müller-Buschbaum Zhi-Kang Xu MOE Key Laboratory of Macromolecular Synthesis and Functionalization and Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China. School of Materials Science and Engineering Zhejiang Sci-Tech University 928 Second Avenue Xiasha Higher Education Park Hangzhou 310018 China. Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education School of Chemistry and Chemical Engineering Shaanxi Normal University Xi'an 710119 China. College of Materials Chemistry and Chemical Engineering Hangzhou Normal University Hangzhou 310036 China. Key Laboratory of Advanced Textile Materials and Manufacturing Technology Ministry of Education Zhejiang Sci-Tech University Hangzhou 310018 China. Physik-Department Lehrstuhl für Funktionelle Materialien Technische Universität München James-Franck-Strasse 1 Garching 85748 Germany. Heinz Maier-Leibnitz-Zentrum Technische Universität München Lichtenbergstrasse 1 85748 Garching Germany. Colleage of Chemical and Biochemical Engineering Zhejiang University Hangzhou 310027 China.

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