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First-principles study of electronic and magnetic properties of self-intercalated van der Waals magnet Cr_(3)Ge_(2)Te_(6)

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Chinese Physics B 2025年第3期34卷 491-497页

作者： Jia-wan Li Shi-Bo Zhao Lin Zhuang Yusheng Hou Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices Center for Neutron Science and TechnologySchool of PhysicsSun Yat-SenGuangzhou 510275China

Self-intercalated van der Waals magnets,characterized by self-intercalating native atoms into van der Waals layered structures with intrinsic magnetism,exhibit a variety of novel physical ***,using first-principles calculations and Monte Carlo simulations,we report a self-intercalated van der Waals ferromagnet,Cr_(3)Ge_(2)Te_(6),which has a high Curie temperature of 492 *** find that Cr_(3)Ge_(2)Te_(6)is nearly half-metallic with a spin polarization reaching up to 90.9%.Due to the ferromagnetism and strong spin-orbit coupling effect in Cr_(3)Ge_(2)Te_(6),a large anomalous Hall conductivity of 138Ω^(-1)·cm^(-1)and 305Ω^(-1)·cm^(-1)can be realized when its magnetization is along its magnetic easy axis and hard axis,*** doping electrons(holes)into Cr_(3)Ge_(2)Te_(6),these anomalous Hall conductivities can be increased up to 318Ω^(-1)·cm^(-1)(648Ω^(-1)·cm^(-1)).Interestingly,a five-layer Cr_(3)Ge_(2)Te_(6)thin film retains room-temperature ferromagnetism with a higher spin polarization and larger anomalous Hall *** study demonstrates that Cr_(3)Ge_(2)Te_(6)is a novel room-temperature self-intercalated ferromagnet with high-spin polarization and large anomalous Hall conductivity,offering great opportunities for designing nano-scale electronic devices.

关键词： self-intercalated van der Waals magnet room-temperature ferromagnet near half-metallicity large anomalous Hall conductivity

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A Compact in situ Polarized ^(3)He System for neutron Scattering

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Chinese Physics Letters 2025年第2期42卷 36-40页

作者： Jian Tang Bin Wang Chuyi Huang Han Gao Qingbo Zheng Renhong Liu Fan Ye Zecong Qin Tianhao Wang Ahmed Salman Yuchen Dong Long Tian Changdong Deng Jun Li Lei Liu Xin Qi Junpei Zhang Xin Tong Institute of High Energy Physics Chinese Academy of ScienceBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China University of Chinese Academy of Sciences Beijing 100049China Guangdong Provincial Key Laboratory of Extreme Conditions Dongguan 523803China Center for Neutron Science and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and DevicesSchool of PhysicsSun Yat-Sen UniversityGuangzhou 510275China J¨ulich Centre for Neutron Science at MLZ Lichtenbergstr.185747 GarchingGermany

This study investigates the performance of a new compact(55 cm×56 cm×48 cm)in situ spin-exchange optical pumping ^(3)He neutron spin filter(NSF)system developed at the China Spallation neutron *** enclosed NSF cell,filled with3He at 2.53 bar,achieved an initial ^(3)He polarization of approximately 60%.After subsequent improvements in the magnetic field and heating system,this in situ system achieved a ^(3)He polarization of 75.66%±0.09%,resulting in 96.30%neutron polarization at *** highly compact in situ system is equipped with self-supportive features,pre-pumping capabilities,polarization maintenance,and a low-noise nuclear magnetic resonance *** advantages significantly reduce the preparation time and simplify polarized neutron experiments,making it suitable for various neutron beamlines in China,particularly those with a limited sample *** characteristics establish it as a quasi-standardized system that plays a vital role in polarized neutron experiments,including those involving polarized neutron imaging,neutron reflection,the performance calibration of polarized neutron instruments,and the neutron optics parity and time reversal experiment.

关键词： polarized system equipped

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Unravel the Spinodal Decomposition Kinetics in(FeCoCrNi)85(AlCu)15 Alloy through Small-Angle neutron Scattering

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Acta Metallurgica Sinica(English Letters) 2025年第1期38卷 86-92页

作者： Shun-Fu Xie Han-Qiu Jiang Zhen-Hua Xie Wei-Wen Zhang Yu-Bin Ke School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou510641China Spallation Neutron Source Science Center Dongguan523803China Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China

High entropy alloys(HEAs)constituted of single solid solution phase,but remains chemical inhomogeneity in nature due to its multi-principal ***,existence of nanoscale spinodal decomposition(SD)phase in matrix was found to have significant impact on the properties of ***,the morphology evolution and the kinetics of SD is not clear,which hinders in-depth understanding of the structure-property *** this study,we examine the spinodal structures in(FeCoCrNi)85(AlCu)15 HEAs at different states using in-situ small-angle neutron scattering(SANS),in conjunction with transmission electron microscopy *** result demonstrates that SD occurred when aging the HEA samples at temperatures ranging from 500 to 800℃,which leads to the phase constitution of NiAlCu-rich and FeCoCr-rich spinodal phases,L1_(2)ordered phases,and FCC *** characteristic wavelength of SD(λ_(SD))grows from 5.31 to 51.26 nm when aging temperature rises from 500 to 800℃,which explains the enhancement of the alloy’s *** SD kinetics was unraveled by fitting the time-dependentλ_(SD)through in-situ SANS measurement at 700℃.During isothermal treatment at 700℃,theλ_(SD)increases from 10.42 to 17.43 nm with prolonged time,and SD is in the late stage from the exponential trend of theλ_(SD)over ***,comparing with aging temperature,the aging time has a relatively minor impact on the coarsening of SD.

关键词： High entropy alloys Spinodal decomposition Small-angle neutron scattering Kinetics

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Atmospheric neutron single event effects for multiple convolutional neural networks based on 28-nm and 16-nm SoC

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Chinese Physics B 2025年第1期34卷 477-484页

作者： Xu Zhao Xuecheng Du Chao Ma Zhiliang Hu Weitao Yang Bo Zheng School of Nuclear Science and Technology University of South ChinaHengyang 421001China Spallation Neutron Source Science Center Dongguan 523000China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China School of Microelectronics Xidian UniversityXi’an 710071China

The single event effects(SEEs)evaluations caused by atmospheric neutrons were conducted on three different convolutional neural network(CNN)models(Yolov3,MNIST,and ResNet50)in the atmospheric neutron irradiation spectrometer(ANIS)at the China Spallation neutron Source(CSNS).The Yolov3 and MNIST models were implemented on the XILINX28-nm system-on-chip(So C).Meanwhile,the Yolov3 and ResNet50 models were deployed on the XILINX 16-nm Fin FET Ultra Scale+*** atmospheric neutron SEEs on the tested CNN systems were comprehensively evaluated from six aspects,including chip type,network architecture,deployment methods,inference time,datasets,and the position of the anchor *** various types of SEE soft errors,SEE cross-sections,and their distribution were analyzed to explore the radiation sensitivities and rules of 28-nm and 16-nm *** current research can provide the technology support of radiation-resistant design of CNN system for developing and applying high-reliability,long-lifespan domestic artificial intelligence chips.

关键词： single event effects atmospheric neutron system on chip convolutional neural network

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Einstein-de Haas effect:a bridge linking mechanics,magnetism,and topology

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science Bulletin 2025年第3期70卷 301-304页

作者： Xin Nie Dao-Xin Yao Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices State Key Laboratory of Optoelectronic Materials and TechnologiesCenter for Neutron Science and TechnologySchool of PhysicsSun Yat-sen UniversityGuangzhou 510275China

The Einstein-de Haas(EdH)effect,which establishes that changes in magnetization induce mechanical rotation,was experimentally demonstrated in 1915[1],independently of Richardson’s[2]earlier conceptual prediction rela... 详细信息

关键词： effect linking topology

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Andreev reflection in superconducting state of pressurized La_(3)Ni_(2)O_(7)

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science China(Physics,Mechanics & Astronomy) 2025年第4期68卷 180-188页

作者： Cong Liu Mengwu Huo Huan Yang Qing Li Yingjie Zhang Zhening Xiang Meng Wang Hai-Hu Wen National Laboratory of Solid State Microstructures and Department of Physics Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Center for Neutron Science and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and DevicesSchool of PhysicsSun Yat-sen UniversityGuangzhou 510275China

The discovery of superconductivity with T_(c)above 77 K in pressurized La_(3)Ni_(2)O_(7)has stimulated enormous interest in the field of unconventional superconductivity.A recent experiment in La_(2)Pr Ni_(2)O_(7)has shown that the superconducting volume is close to100%.Because the superconductivity can only be achieved under high pressures,many intrinsic properties,such as the superconducting gaps,have not been measured *** report the Andreev reflection measurement of pressurized La_(3)Ni_(2)O_(7)with the onset superconducting transition temperature at about 77 *** data reveal a clear peak of differential conductivity near zero bias in the tunneling spectrum;and appear also are some temperature-dependent steps that may reflect other superconducting *** based on the Blonder-Tinkham-Klapwijk model with multiple components can roughly fit the data,and the central peak can be fitted with a d-wave gap with a magnitude of about 9 meV,and other two s-wave gaps at about 16 and 26 *** latter two large gaps are determined from the enhanced steps of the differential conductivity,which may have other *** results reveal possible evidence of a sign-reversal gap and multi-component features of the superconducting gaps in the nickelate 327 systems.

关键词： nickelate superconductor La_(3)Ni_(2)O_(7) point contact spectrum sign-reversal gap multigap superconductor

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Alkali metal pyridinolate/piperidinolate pairs: A new type of materials for efficient reversible hydrogen storage

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Journal of Energy Chemistry 2025年第4期103卷 353-360页

作者： Alexis Munyentwali Yang Yu Xingchi Zhou Wei Zhou Qijun Pei Khai C.Tan Anan Wu Hui Wu Teng He Ping Chen Dalian Institute of Chemical Physics Chinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry College of Chemistry and Chemical Engineering Xiamen University NIST Center for Neutron Research National Institute of Standards and Technology

Chemical hydrogen storage in organic materials is a promising method thanks to its high storage density,reversibility,and ***,the dehydrogenation process of organic materials requires high temperatures due to their unfavorable thermodynamic *** study proposes a strategy to design a new type of hydrogen storage materials,i.e.,alkali metal pyridinolate/piperidinolate pairs,by combining the effects of a heteroatom and an alkali metal in one molecule to achieve suitable dehydrogenation thermodynamics along with high hydrogen storage *** air-stable compounds can be synthesized using low-cost reactants and water as a green *** predictions indicate that enthalpy changes of dehydrogenation（ΔHd） can be significantly reduced to the optimal range for efficient hydrogen release,exemplified by lithium 2-piperidinolate with a 5.6 wt% hydrogen capacity and a suitable ΔHdof 32.2 kJ/*** results obtained using sodium systems validate the computational predictions,demonstrating reversible hydrogen storage even below 100℃.The superior hydrogen desorption performance of alkali metal piperidinolates could be attributed to their suitable ΔHdinduced by the combined effect of ring nitrogen and metal substitution on their *** study not only reports new low-cost hydrogen storage materials but also provides a rational design strategy for developing metalorganic compounds possessing high hydrogen capacities and suitable thermodynamics for efficient hydrogen storage.

关键词： Alkali metal pyridinolates Alkali metal substitution Hydrogen storage Metalorganic compounds Ring nitrogen

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Plate spent fuel burnup measurement equipment based on a compact D-D neutron generator

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Nuclear science and Techniques 2025年第3期36卷 189-200页

作者： Yi-Nong Li Zheng Wei Gen-Tao Gao Lu Wu Kang Wu Jun Ma Xing-Yu Liu Ze-En Yao Yu Zhang Jun-Run Wang Xiao-Dong Su Zhi-Yong Deng Guo-Rong Wan School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Engineering Research Center for Neutron Application Ministry of EducationLanzhou UniversityLanzhou 730000China Frontiers Science Center for Rare Isotopes Lanzhou UniversityLanzhou 730000China Nuclear Power Institute of China Chengdu 610000China Wuhan Second Ship Design and Research Institute Wuhan 430205China

Burnup measurement is crucial for the management and disposal of spent *** conventional approach indirectly estimates burnup by examining the fission product or actinide *** to the first two methods,the active neutron method exhibits a lower dependence on the irradiation history and initial enrichment degree of the spent *** addition,it can be used to directly determine the content of fissile nuclides in spent *** study proposed the design of a burnup measurement equipment specifically crafted for plate segments by utilizing a compact D-D neutron *** equipment initiates the fission of fissile nuclides within the spent fuel plate segment through thermal neutrons provided by the ***,the burnup is determined by analyzing the transmitted thermal neutrons and counting the fission fast *** Monte Carlo program Geant4 was used to simulate the relationship between spent fuel plate segment assembly burnup and the detector count of 10 MW material test reactor designed by the International Atomic Energy ***,the feasibility of the method and rationality of the detector design were verified.

关键词： Burnup measurement Plate spent fuel Active neutrons

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Low-energy edge signatures of the Kitaev spin liquid

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Physical Review B 2025年第16期111卷 L161104-L161104页

作者： Shang-Shun Zhang Cristian D. Batista Gábor B. Halász Department of Physics and Astronomy The University of Tennessee Knoxville Tennessee 37996 USA Neutron Scattering Division and Shull-Wollan Center Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Quantum Science Center Oak Ridge Tennessee 37831 USA

Recent experimental work indicates that the Kitaev spin liquid may be realizable close to zero magnetic field in exfoliated α−RuCl3 flakes, thus providing a more versatile setting for studying non-Abelian anyons. Here, we propose a robust nanoscale signature of the Kitaev spin liquid that results from its edge states and manifests in the low-energy spin dynamics. In particular, we highlight a singular peak in the dynamical spin structure factor of a zigzag edge whose energy scales linearly with only one component of the magnetic field. This sharp feature in the local spin dynamics directly reflects the bond-directional Kitaev spin interactions and, more generally, the projective symmetries of the Kitaev spin liquid. We demonstrate that our proposed signature survives in the presence of edge disorder as well as non-Kitaev interactions, and provide detailed guidelines for experimentally observing it using inelastic electron tunneling spectroscopy and color-center relaxometry.

关键词： Spin dynamics

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Great influence of demagnetization history on internal interaction and magnetization process of mischmetal-based magnets

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science China(Physics,Mechanics & Astronomy) 2025年第2期68卷 183-192页

作者： Dan Liu Jiefu Xiong Lichen Wang Xinqi Zheng Xin Ming Jiaying Jin Jiazheng Hao He Bai Zhenxing Li Tongyun Zhao Fengxia Hu Jirong Sun Jun Shen Baogen Shen Department of Physics Beijing Technology and Business UniversityBeijing 10048China Ningbo Institute of Materials Technology&Engineering Chinese Academy of SciencesNingbo 31521China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China Spallation Neutron Source Science Center Dongguan 523803China School of Mechanical Engineering Beijing Institute of Technology Beijing 100081China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 101408China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China

The magnetization process and corresponding magnetization curve are usually used to analyze the coercivity mechanism of NdFe-B based sintered ***,different demagnetization histories will seriously influence the magnetization curve,leading to an inaccurate understanding and analysis of magnetization *** this work,we investigated the magnetization behavior of multi-main phase(MMP)magnets with thermal demagnetized and alternating current demagnetized *** curves of initial magnetization process and demagnetization process of thermal demagnetized magnets reflect the movement of domain walls inside the grains and the magnetization interaction between the grains,*** is noted that the former process cannot represent the magnetization reversal of the entire magnet,which is not appropriate to analyze coercivity mechanism *** the recoil curves of both two processes of AC demagnetized magnets can illustrate the magnetization reversal of the entire grains and the interaction between ***-optical Kerr microscope shows that the grains of thermal demagnetized magnets are in multi-domain states,and the grains of AC demagnetized magnets are almost in singledomain *** walls of thermal demagnetized magnets move easily within the grains,which is more conducive to magnetization saturation in industrial *** addition,the minorloops of thermal demagnetized magnets can independently represent the transition of grains from multi-domain to single-domain and the demagnetization of single-domain grains,which is equivalent to characterizing the internal interactions by recoil *** investigation of magnetization characteristics of MMP sintered magnets starting from different demagnetized states is helpful to further understand the internal interaction and magnetic hardening mechanism.

关键词： permanent magnet demagnetization history magnetization reversal misch-metal rare earth

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