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Predicted High-Temperature Superconductivity in Rare Earth Hydride ErH2 at Moderate Pressure

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Chinese Physics Letters 2022年第12期39卷 84-88页

作者： Yiding Liu Qiang Fan Jianhui Yang Lili Wang Weibin Zhang Gang Yao College of Mathematics and Physics Leshan Normal UniversityLeshan 614004China institute of Atomic and Molecular Physics Sichuan UniversityChengdu 610065China School of New Energy materials and Chemistry Leshan Normal UniversityLeshan 614004China institute of Computer Application China Academy of Engineering PhysicsMianyang 621900China College of Physics and Electronics information Yunnan Key Laboratory of Optoelectronic Information TechnologyYunnan Normal UniversityKunming 650500China School of Physical science and Technology Southwest UniversityChongqing 400715China Tsung-Dao Lee institute Shanghai Jiao Tong UniversityShanghai 200240China

Hydrides offer an opportunity to study high critical temperature(high-Tc)superconductivity at experimentally achievable ***,the pressure needed remains extremely *** density functional theory calculations,herein we demonstrate that a new rare earth hydride ErH2could be superconducting with Tc~80 K at 14.5 GPa,the lowest reported value for compressed hydrides to ***,due to Kondo destruction,superconductivity was prone to exist at 15 *** also reveal an energy gap at 20 GPa on the background of normal metallic *** 20 GPa,this compressed system could act as a host of superconductor judged from a sharp jump of spontaneous magnetic susceptibility with an evanescent spin density of state at Fermi ***,electron pairing glue for ErH2at these three typical pressures was attributed to the antiferromagnetic spin fluctuation.

关键词： Rare Kondo superconductor

Characterizing in situ poroelastic properties of cytoplasm by the translation of a rigid spherical inclusion

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Acta Mechanica Sinica 2021年第2期37卷 194-200页

作者： Xuechao Sun Xin Chen Ming Wang Moxiao Li Yonggang Liu Shaobao Liu Tian Jian Lu State key laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China Xi'an Modern Chemistry research institute Xi'an 710065China State key laboratory for Strength and Vibration of Mechanical Structures School of AerospaceXi'an Jiaotong UniversityXi'an 710049China Bioinspired Engineering&Biomechanics Center(BEBC) Xi'an Jiaotong UniversityXi'an 710049China key laboratory of Biomedical information Engineering of ministry of education School of Life Science and TechnologyXi'an Jiaotong UniversityXi'an 710049China

Poroelasticity of cytoplasm is a rate-and size-dependent biphasic material behavior that reflects the normal activities and pathological states of cells,mainly caused by the migration of fluid molecules and the deformation of porous solid skeleton(protein scaffold).While micro/nano-indentation tests have been extensively used to characterize the poroelasticity of a cell,characterizing the in situ poroelasticity of cytoplasm remains *** this study,based on the theory of the translation of a rigid spherical inclusion,we proposed a new method to characterize the in situ poroelasticity of *** on data from optical/magnetic tweezers tests,we estimated three key poroelasticity parameters-shear modulus,Poisson ratio and diffusion coefficient-of cytoplasm for a variety of cells,including cardiomyocytes,endothelial cells of bovine capillary,and *** proposed method provides a powerful tool for in situ measurement of poroelastic properties of cytoplasm via optical/magnetic tweezers.

关键词： Biot theory Diffusion coefficient Optical/magnetic tweezers.Finite element

Anisotropic Magnon–Magnon Coupling in Synthetic Antiferromagnets

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Chinese Physics Letters 2021年第5期38卷 137-142页

作者： Wei He ZKXie Rui Sun Meng Yang Yang Li Xiao-Tian Zhao Wei Liu Z.D.Zhang Jian-Wang Cai Zhao-Hua Cheng Jie Lu State key laboratory of Magnetism and Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Shenyang National laboratory for materials science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China College of Physics and Hebei Advanced Thin Films Laborato

Magnon-magnon coupling in synthetic antiferromagnets advances it as hybrid magnonic systems to explore the quantum information *** induce magnon-magnon coupling,the parity symmetry between two magnetization needs to be *** we experimentally demonstrate a convenient method to break the parity symmetry by the asymmetric *** successfully introduce a magnon-magnon coupling in Ir-based synthetic antiferromagnets CoFeB(10 nm)/Ir(t_(Ir)=0.6 nm,1.2 nm)/CoFeB(13 nm).Remarkably,we find that the weakly uniaxial anisotropy field(-20 Oe)makes the magnon-magnon coupling *** coupling strength presented by a characteristic anticrossing gap varies in the range between 0.54 GHz and 0.90 GHz for t_(Ir)=0.6 nm,and between 0.09 GHz and 1.4 GHz for t_(Ir)=1.2 *** results demonstrate a feasible way to induce magnon-magnon coupling by an asymmetric structure and tune the coupling strength by varying the direction of in-plane magnetic *** magnon-magnon coupling in this highly tunable material system could open exciting perspectives for exploring quantum-mechanical coupling phenomena.

关键词： net red Magnon Coupling in Synthetic Antiferromagnets Anisotropic Magnon

Fast UV-vis-NIR photoresponse of self-oriented F_(16)CuPc nanoribbons

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Nano research 2023年第7期16卷 9561-9568页

作者： Lingyu Zhang Xingyu Wang Wei Zhou Hao Wang Jiaxun Song Zihao Zhao Jihui Liao Jian Song Yajun Li Jinyou Xu institute of Electronic Paper Displays South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China Department of materials and Interfaces Weizmann Institute of ScienceRehovot 76100Israel

Controlling the vapor-deposited nanoribbons to grow along a consistent orientation will enable the desired in situ integration of functional devices,representing a major technological advance compared to post-growth processing *** this work,ntype F_(16)CuPc molecules are self-assembled into horizontally-oriented nanoribbons with a consistent growth axis after creating periodic hydrophobic nanogrooves on a sapphire ***,electrodes are deposited directly on the growth substrate to enable in situ fabrication of *** on the deposited electrodes,these horizontally-oriented nanoribbons are connected to form a monolithic photodetector with a large sensing area or an on-chip array of photodetectors with multiple detector *** in situ integration strategy avoids potential structural damage and contamination from impurities associated with post-growth processing ***,the vapor-deposited nanoribbons can retain their high quality during the device manufacturing process,which contributes to performance *** a result,the in-situ integrated F_(16)CuPc photodetectors exhibit a sensitive response in the ultraviolet-visible-near-infrared(UV-vis-NIR)*** response time is on the order of tens of milliseconds,the fastest record ever for the F_(16)CuPc-based ***,statistics from an array of 6×6 photodetectors show little variation in their sensitivity and response time,and hence this in situ fabrication scheme will contribute to the implementation of on-chip integrated photodetectors with consistent performance based on bottom-up ***,this self-oriented growth provides a versatile option to achieve desired in-situ integrated functional devices based on bottom-up nanoribbons.

关键词： fluorinated copper phthalocyanine nanoribbon planar array photodetector in situ integration

Structural and functional imaging of brains

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science China Chemistry 2023年第2期66卷 324-366页

作者： Zhichao Liu Ying Zhu Liming Zhang Weiping Jiang Yawei Liu Qiaowei Tang Xiaoqing Cai Jiang Li Lihua Wang Changlu Tao Xianzhen Yin Xiaowei Li Shangguo Hou Dawei Jiang Kai Liu Xin Zhou Hongjie Zhang Maili Liu Chunhai Fan Yang Tian Shanghai key laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai200241China Interdisciplinary research Center Shanghai Synchrotron Radiation FacilityZhangjiang LaboratoryShanghai Advanced Research InstituteChinese Academy of SciencesUniversity of Chinese Academy of SciencesShanghai201210China State key laboratory of magnetic Resonance and Atomic and Molecular Physics Chinese Academy of SciencesWuhan National Laboratory for OptoelectronicsWuhan430071China State key laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China Department of Chemistry Tsinghua UniversityBeijing100084China School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesInstitute of Translational MedicineShanghai Jiao Tong UniversityShanghai200240China Interdisciplinary Center for Brain information Brain Cognition and Brain Disease InstituteShenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research InstitutionsFaculty of Life and Health SciencesShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China Lingang laboratory Shanghai201602China School of Biomedical Engineering Shanghai Jiao Tong UniversityShanghai200240China institute of Systems and Physical Biology Shenzhen Bay LaboratoryShenzhen518055China Department of Nuclear Medicine Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430022China

Analyzing the complex structures and functions of brain is the key issue to understanding the physiological and pathological *** neuronal morphology and local distribution of neurons/blood vessels in the brain have been known,the subcellular structures of cells remain challenging,especially in the live *** addition,the complicated brain functions involve numerous functional molecules,but the concentrations,distributions and interactions of these molecules in the brain are still poorly *** this review,frontier techniques available for multiscale structure imaging from organelles to the whole brain are first overviewed,including magnetic resonance imaging(MRI),computed tomography(CT),positron emission tomography(PET),serial-section electron microscopy(ss EM),light microscopy(LM)and synchrotron-based X-ray microscopy(XRM).Specially,XRM for three-dimensional(3D)imaging of large-scale brain tissue with high resolution and fast imaging speed is ***,the development of elegant methods for acquisition of brain functions from electrical/chemical signals in the brain is *** particular,the new electrophysiology technologies for neural recordings at the single-neuron level and in the brain are also *** also focus on the construction of electrochemical probes based on dual-recognition strategy and surface/interface chemistry for determination of chemical species in the brain with high selectivity and long-term stability,as well as electrochemophysiological microarray for simultaneously recording of electrochemical and electrophysiological signals in the ***,the recent development of brain MRI probes with high contrast-to-noise ratio(CNR)and sensitivity based on hyperpolarized techniques and multi-nuclear chemistry is ***,multiple optical probes and instruments,especially the optophysiological Raman probes and fiber Raman photometry,for imaging and biosensing in live brain are emphas

关键词： brain structure brain function brain chemistry chemical signal biosensing and bioimaging

Unusual electronic structure of Dirac material BaMnSb_(2) revealed by angle-resolved photoemission spectroscopy

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Chinese Physics B 2021年第6期30卷 52-57页

作者： Hongtao Rong Liqin Zhou Junbao He Chunyao Song Yu Xu Yongqing Cai Cong Li Qingyan Wang Lin Zhao Guodong Liu Zuyan Xu Genfu Chen Hongming Weng Xingjiang Zhou National laboratory for Superconductivity Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China university of Chinese Academy of sciences Beijing 100049China Henan International Joint laboratory of MXene materials Microstructure College of Physics and Electronic EngineeringNanyang Normal UniversityNanyang 473061China Songshan Lake materials laboratory Dongguan 523808China Technical institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100190China Beijing Academy of Quantum information sciences Beijing 100193China

High resolution angle resolved photoemission measurements and band structure calculations are carried out to study the electronic structure of BaMnSb_(2). All the observed bands are nearly linear that extend to a wide energy range. The measured Fermi surface mainly consists of one hole pocket around Γ and a strong spot at Y which are formed from the crossing points of the linear bands. The measured electronic structure of BaMnSb_(2) is unusual and deviates strongly from the band structure calculations. These results will stimulate further efforts to theoretically understand the electronic structure of BaMnSb_(2) and search for novel properties in this Dirac material.

关键词： ARPES BaMnSb_(2) Dirac material magnetic topological material

Synthesis, Crystal Structure and Characterization of a New Manganese(Ⅱ) Complex with o-Benzoylbenzoic Acid

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Chinese Journal of Structural Chemistry 2021年第5期40卷 631-636,530页

作者： LI Wei LI Chang-Hong ZHOU Shui-Qi LI Yu-Lin KUANG Yun-Fei School of Chemistry and materials science Hengyang Normal UniversityHengyang 421008China School of materials and Chemical Engineering Hunan Institute of TechnologyHengyang 421002China Zhejiang Center Good-testing Service Co.Ltd. Zhejiang 321025China

A new manganese(Ⅱ) complex [Mn(C_(14)H_(9)O_(3))_(2)(C_(12)H_(8)N_(2))_(2)]·4H_(2)O(1) was synthesized with o-benzoylbenzoic acid, manganese sulfate and 1,10-phenanthroline(phen) in the mixture of acetonitrile and water solvent. It crystallizes(C_(52)H_(42)MnN_(4)O_(10), M_(r) = 937.83) in monoclinic, space group P2_(1/n) with a = 13.3528(5), b = 17.6963(6), c = 19.7889(7) A, β = 109.647(4)o, V = 4403.8(3) A3, D_(c) = 1.415 g/cm^(3), Z = 4, F(000) = 1948, μ(Mo Kα) = 0.368 mm^(-1), R = 0.0404 and w R = 0.0956. The crystal structure shows that the manganese ion is coordinated with two oxygen atoms from two o-benzoylbenzoic acid molecules and four nitrogen atoms from two phen molecules, forming a distorted octahedral coordination geometry. The TG, spectrum analysis and magnetic properties of 1 were studied.

关键词： manganese(Ⅱ)complex spectrum analysis thermal stability magnetic property

Enhanced magnetostrictive properties of lightly Pr-doped Fe83Ga17 alloys

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Journal of Rare Earths 2020年第3期38卷 257-264页

作者： Lijuan Zhao Xiao Tian Zhanquan Yao Xuan Zhao Rui Wang Hamt O Liping Jiang Vincent G.Harris Inner Mongolia key laboratory for Physics and Chemistry of Functional materials School of Physics and Electronic InformationInner Mongolia Normal UniversityHohhot 010022China School of Water Conservancy and Civil Engineering Inner Mongolia Agricultural UniversityHohhot 010018China Baotou research institute of Rare Earths Baotou 014030China Department of Electrical and Computer Engineering CM3ICNortheastern UniversityBostonMA 02115USA

Fe83Ga17Prx alloys,where x=0,0.2,0.4,0.6 and 1.0,were prepared by a non-consumable vacuum arc melting technique under an inert argon gas *** crystal structure and surface morphologies of the alloys were studied by X-ray diffraction(XRD) and scanning electron microscopy(SEM),*** compositional variations were measured by energy dispersive X-ray spectroscopy(EDXS).The magnetostriction coefficients of the alloys were measured by means of a differential resistive strain *** magnetism of the sample was measured by a vibrating sample magnetometer(VSM).The results show that the parent Fe83Ga17 alloy consists of a single A2 phase of bcc symmetry,whereas the Pr doped Fe83Ga17 alloys are composed of the A2 phase of bcc structure and a small volume fraction of PrGa2 as a secondary *** importantly,with increasing x,the magnetostriction coefficient of the Fe83Ga17Prx alloys first increases reaching a maximum saturation magnetostriction coefficient of192 ppm for x=0.6 at a magnetic field strength of 486 kA/m,then *** maximum represents a 400% increase over the parent alloy with a mere 0.6 at% Pr doping.

关键词： Fe-Ga alloy Magnetostriction Praseodymium Rare earth element doping

magnetic skyrmions:materials,manipulation,detection,and applications in spintronic devices

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materials Futures 2023年第3期2卷 53-71页

作者： Huai Zhang Yajiu Zhang Zhipeng Hou Minghui Qin Xingsen Gao Junming Liu Guangdong Provincial key laboratory of Optical information materials and Technology Institute for Advanced MaterialsSouth China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006People’s Republic of China School of Civil Engineering Guangzhou UniversityGuangzhou 510006People’s Republic of China laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 211102People’s Republic of China

magnetic skyrmions are vortex-like spin configurations that possess nanometric dimensions,topological stability,and high controllability through various external *** their first experimental observation in helimagnet MnSi in 2009,magnetic skyrmions have emerged as a highly promising candidate for carrying information in future high-performance,low-energy-consumption,non-volatile information storage,and logical *** this article,we provide a comprehensive review of the progress made in the field of magnetic skyrmions,specifically in materials,manipulation,detection,and application in spintronic ***,we introduce several representative skyrmion material systems,including chiral magnets,magnetic thin films,centrosymmetric materials,and Van der Waals *** then discuss various methods for manipulating magnetic skyrmions,such as electric current and electric field,as well as detecting them,mainly through electrical means such as the magnetoresistance ***,we explore device applications based on magnetic skyrmions,such as track memory,logic computing,and neuromorphic ***,we summarize the challenges faced in skyrmion research and provide future perspectives.

关键词： magnetic skyrmions spintronics magnetic memory