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Regulation of charge density wave and superconductivity in kagome superconductor CsV3Sb5 by intercalation

Progress in Natural Science:Materials International 2025年第01期 122-128页

作者： Han Xiao Yingxu Zhang Lixuan Yu Mengjuan Mi Xiangqi Liu Qihui Cui Bingbing Lyu yanfeng guo Min Liu Shanpeng Wang Yilin Wang School of Integrated Circuits Shandong Technology Center of Nanodevices and Integration State Key Laboratory of Crystal Materials Shandong University School of Physical Science and Technology ShanghaiTech University State Key Laboratory of Crystal Materials Institute of Crystal Materials Shandong University ShanghaiTech Laboratory for Topological Physics ShanghaiTech University

AV3Sb5（A = K, Rb, and Cs）, recently discovered van der Waals Kagome metals, exhibit a multitude of intriguing strongly correlated phenomena, particularly the unconventional charge density wave（CDW） and superconductivity, and thus have generated tremendous attention. In this study, we modulated CDW orders and superconductivity in CsV3Sb5flakes utilizing an ionic-gel electrolyte（LiClO4/PEO）, which also serves as a protective layer to prevent the CsV3Sb5thin flakes from being degraded in air. The dominated carriers of pristine CsV3Sb5undergoes a transition from electron-type above 50 K to hole-type below 10 K, while both electron and hole carriers participate in the transport process at 25 K. The CDW transition temperature increases（from 86 K up to 106 K）and behaves a positive correlation with the electron-type carrier concentration, while the superconducting transition temperature decreases and behaves a negative correlation with the hole-type carrier concentration. The regulation of carrier density induces a shift in the relative positions of Fermi level and van Hove singularities,leading to the modulation of CDW order and superconductivity. Our work demonstrates CsV3Sb5as a versatile platform for tuning CDW order and superconductivity, and provides valuable insights into the physical properties of Kagome metals.

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Lump solutions and interaction solutions for(2+1)-dimensional KPI equation

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Frontiers of Mathematics in China 2022年第5期17卷 875-886页

作者： yanfeng guo Zhengde DAI Chunxiao guo School of Mathematics and Physics China University of GeosciencesWuhan 430074China School of Science Guangxi University of Science and TechnologyLiuzhou 545006China School of Mathematics and Statistics Yunnan UniversityKunming 650091China School of Science China University of Mining and TechnologyBeijing 100083China

The lump solutions and interaction solutions are mainly investigated for the(2+1)-dimensional KPI *** to relations of the undetermined parameters of the test functions,the N-soliton solutions are showed by computations of the Maple using the Hirota bilinear form for(2+1)-dimensional KPI *** type of the lump solutions for(2+1)-dimensional KPI equation has been deduced by the limit method of the N-soliton *** addition,the interaction solutions between the lump and N-soliton solutions of it are studied by the undetermined interaction *** sufficient conditions for the existence of the interaction solutions are ***,the new breather solutions for the(2+1)-dimensional KPI equation are considered by the homoclinic test method via new test functions including more parameters than common test functions.

关键词： Lump solutions (2+1)-dimensional KPI equation')"href="#">(2+1)-dimensional KPI equation interaction solutions N-soliton solutions breather solutions

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接枝法改性聚丙烯腈纤维研究进展

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精细石油化工 2025年第1期42卷 61-65页

作者：赵敏郭岩锋贾庆龙王莹朱相春中国石油化工股份有限公司齐鲁分公司研究院山东淄博255000

介绍了聚丙烯腈纤维化学接枝改性的主要方法,并对改性后纤维存在的机械性能差、利用率低等问题进行了阐述和分析,指出采用温和的化学改性方法以及扩展规模化改性纤维应用领域是其未来发展的主要方向。

关键词：聚丙烯腈纤维接枝法改性偕胺肟基胺基氰基

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不同地震工况下双柱式桥梁桩柱最优配筋率分析研究

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城市道桥与防洪 2025年第2期 115-120,149页

作者：薄士威郭炎峰刘强甘肃省交通规划勘察设计院股份有限公司甘肃兰州730030

地震损毁作为公路常规双柱式桥梁常见的重大病害之一,受到越来越多学者的关注,但基于工程实体探究桥梁墩柱、桩基满足抗震性能的最优配筋率的研究相对较少。针对甘肃省常见的4种地震工况,通过有限元软件系统分析不同尺寸双柱式桥墩满足... 详细信息

地震损毁作为公路常规双柱式桥梁常见的重大病害之一,受到越来越多学者的关注,但基于工程实体探究桥梁墩柱、桩基满足抗震性能的最优配筋率的研究相对较少。针对甘肃省常见的4种地震工况,通过有限元软件系统分析不同尺寸双柱式桥墩满足抗震需求的控制指标,确定了关键模型和9种最不利安全系数,从而进一步得到4种地震工况下桥梁墩柱、桩基的最优配筋率。所得结论可供工程师在实际工程中参考应用,为更科学合理地确定桥梁墩柱、桩基的配筋提供支撑。

关键词：地震工况双柱式桥梁抗震性能最优配筋率安全系数

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Factors affecting the superconductivity in the process of depositing Nd_(1.85)Ce_(0.15)CuO_(4-δ)by the pulsed electron deposition technique

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Science China(Physics,Mechanics & Astronomy) 2007年第6期50卷 747-752页

作者： guo yanfeng CHEN LeiMing guo Xi LI PeiGang LEI Ming TANG WeiHua Department of Physics Center for Optoelectronics Materials and DevicesZhejiang Sci-Tech UniversityHangzhou 310018China National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100080China Department of Mathematics and Physics Zhengzhou Institute of Aeronautical Industry and ManagementZhengzhou 450015China

On SrTiO3 single crystal substrate,by using the pulsed electron deposition tech-nique,the high-quality electron doped Nd1.85Ce0.15CuO4?δ superconducting film was successfully fabricated. After careful study on the R-T curves of the obtained sam-ples deposited with different substrate temperatures,thicknesses,annealing methods and pulse frequencies,the effects of them on the superconductivity of the films were found,and the reasons were also analyzed. Additionally,by using the same model of the pulsed laser deposition technique,the relation between the target-to-substrate distance and the deposition pressure was drawn out as a quantitative one.

关键词： pulsed electron deposition Nd_(1.85)Ce_(0.15)CuO_(4-δ) film superconductivity

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利用管道混合器萃取四氯乙烯中的游离酸

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氯碱工业 2025年第1期61卷 17-18页

作者：王斌郭延锋万育铭泸州鑫福化工股份有限公司四川泸州646000

分析了四氯乙烯生产中产品pH值的现状,提出了采用管道混合器进行萃取来解决产品pH值的方案,并在投入生产前在实验室进行萃取试验。在生产过程中的应用情况表明,管道混合器能提升萃取效果,稳定产品pH值。

关键词：四氯乙烯萃取管道混合器 pH值

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Observation of large in-plane anisotropic transport in van der Waals semiconductor Nb_(2)SiTe_(4)

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Chinese Physics B 2021年第8期30卷 456-461页

作者： Kaiyao Zhou Jun Deng Long Chen Wei Xia yanfeng guo Yang Yang Jian-Gang guo Liwei guo Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China ShanghaiTech Laboratory for Topological Physics ShanghaiTech UniversityShanghai 201210China

Two-dimensional(2D)van der Waals material is a focus of research for its widespread application in optoelectronics,memories,and *** ternary compound Nb_(2)SiTe_(4) is a van der Waals semiconductor with excellent air stability and small cleavage energy,which is suitable for preparing a few layers counterpart to explore novel ***,properties of bulk Nb_(2)SiTe_(4) with large in-plane electrical anisotropy are *** is found that hole carriers dominate at a temperature above 45 K with a carrier active energy of 31.3 *** carrier mobility measured at 100 K is about 213 cm^(2)·V^(-1)·s^(-1) in bulk Nb_(2)SiTe_(4),higher than the reported *** a thin flake Nb_(2)SiTe_(4),the resistivity ratio between the crystalline axes of a and b is reaching about 47.3 at 2.5 K,indicating that there exists a large anisotropic transport behavior in their basal *** novel transport properties provide accurate information for modulating or utilizing Nb_(2)SiTe_(4) for electronic device applications.

关键词： carrier mobility anisotropic transport Raman spectroscopy

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High-pressure study of topological semimetals XCd_(2)Sb_(2)(X=Eu and Yb)

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Chinese Physics B 2022年第7期31卷 65-70页

作者： Chuchu Zhu Hao Su Erjian Cheng Lin guo Binglin Pan Yeyu Huang Jiamin Ni yanfeng guo Xiaofan Yang Shiyan Li State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200438China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China Shanghai Research Center for Quantum Sciences Shanghai 201315China

Topological materials have aroused great interest in recent years,especially when magnetism is *** can effectively tune the topological states and possibly induce *** we report the high-pressure study of topological semimetals XCd_(2)Sb_(2)(X=Eu and Yb),which have the same crystal *** antiferromagnetic(AFM)Weyl semimetal EuCd_(2)Sb_(2),the Néel temperature(TN)increases from 7.4 K at ambient pressure to 50.9 K at 14.9 *** pressure is above 14.9 GPa,the AFM peak of resistance disappears,indicating a non-magnetic *** paramagnetic Dirac semimetal candidate YbCd_(2)Sb_(2),pressure-induced superconductivity appears at 1.94 GPa,then Tc reaches to a maximum of 1.67 K at 5.22 GPa and drops to zero at about 30 GPa,displaying a dome-shaped temperature–pressure phase ***-pressure x-ray diffraction measurement demonstrates that a crystalline-to-amorphous phase transition occurs at about 16 GPa in YbCd_(2)Sb_(2),revealing the robustness of pressure-induced superconductivity against structural *** structural phase transition may also occur in EuCd_(2)Sb_(2),causing the disappearance of *** results show that XCd_(2)Sb_(2)(X=Eu and Yb)is a novel platform for exploring the interplay among magnetism,topology,and superconductivity.

关键词： high pressure topological semimetal magnetism superconductivity

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Pullback Random Attractors for Non-Autonomous Stochastic Fractional FitzHugh-Nagumo System

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Journal of Applied Mathematics and Physics 2020年第1期8卷 115-131页

作者： Chunxiao guo Yiju Chen yanfeng guo Department of Mathematics China University of Mining and Technology Beijing Beijing China School of Mathematics and Physics China University of Geosciences Wuhan China School of Science Guangxi University of Science and Technology Liuzhou China

This paper is concerned with the asymptotic behavior of solutions for a class of non-autonomous fractional FitzHugh-Nagumo equations deriven by additive white noise. We first provide some sufficient conditions for the existence and uniqueness of solutions, and then prove the existence and uniqueness of tempered pullback random attractors for the random dynamical system generated by the solutions of considered equations in an appropriate Hilbert space. The proof is based on the uniform estimates and the decomposition of dynamical system.

关键词： Non-Autonomous Stochastic Fractional FitzHugh-Nagumo System Random Attractor Additive White Noise

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Absence of metallicity and bias-dependent resistivity in low-carrier-density EuCd_(2)As_(2)

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Science China(Physics,Mechanics & Astronomy) 2024年第4期67卷 119-125页

作者： Yuxiang Wang Jianwen Ma Jian Yuan Wenbin Wu Yong Zhang Yicheng Mou Jiaming Gu Peihong Cheng Wu Shi Xiang Yuan Jinglei Zhang yanfeng guo Cheng Zhang State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing Fudan UniversityShanghai 200433China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200241China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory of the Chinese Academy of SciencesHefei 230031China School of Physics and Electronic Science East China Normal UniversityShanghai 200241China Zhangjiang Fudan International Innovation Center Fudan UniversityShanghai 201210China ShanghaiTech Laboratory for Topological Physics Shanghai 201210China

EuCd_(2)As_(2)was theoretically predicted to be a minimal model of Weyl semimetals with a single pair of Weyl points in the ferromagnet ***,the heavily p-doped Eu Cd_(2)As_(2)crystals in previous experiments prevent direct identification of the semimetal ***,we present a comprehensive magneto-transport study of high-quality Eu Cd_(2)As_(2)crystals with ultralow bulk carrier density(10^(13)cm^(-3)).In contrast to the general expectation of a Weyl semimetal phase,Eu Cd_(2)As_(2)shows insulating behavior in both antiferromagnetic and ferromagnetic states as well as surface-dominated conduction from band ***,the application of a dc bias current can dramatically modulate the resistance by over one order of magnitude,and induce a periodic resistance oscillation due to the geometric *** nonlinear transport results from the high nonequilibrium state induced by an electrical field near the band *** results suggest an insulating phase in Eu Cd_(2)As_(2)and put a strong constraint on the underlying mechanism of anomalous transport properties in this system.

关键词： magnetic Weyl semimetal quantum transport Hall effect nonlinear resistivity

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