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Insights to unusual antiferromagnetic behavior and exchange coupling interactions in Mn_(23)C_(6)

Chinese physics B 2025年第3期34卷 152-159页

作者： Ze-Kun Yu Chao Zhou Kuo Bao Zhao-Qing Wang En-Xuan Li Jin-Ming Zhu Yuan Qin Yu-Han Meng Pin-Wen Zhu Qiang Tao Tian Cui State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China Institute of High Pressure Physics School of Physical Science and TechnologyNingbo UniversityNingbo 315211China

We report the structural,mechanical and electromagnetic properties of the intermetallic compound Mn_(23)C_(6).The bulk Mn_(23)C_(6)sample was synthesized using high temperature high pressure quenching method(HTHPQM),and investigated in detail by x-ray diffraction,electron microscope,magnetization and electrical resistivity measurements,***-principles calculation based on density functional theory ab intio simulation was carried out to calculate the bonding and electromagnetic properties of Mn_(23)C_(6).Based on our experimental and simulated results,the Mn_(23)C_(6)in this work is single phase of a faced-centered cubic structure with space group Fm-3m(No.225).Determined by SEM and TEM,the bulk sample consists of monocrystal Mn_(23)C_(6)crystals with 2-15μm grain sizes,it is the quick quenching method in the synthesizing process that brings such small crystal grain *** method gives its density of 7.14 g/cm^(3),95.74%of its theoretically calculated density 7.458 g/cm^(3).Owing to the abundant Mn 3d electrons and a framework of strongly linked Mn atoms in Mn_(23)C_(6),the electrical conductivity is up to 8.47×10^(-4)Ω·m,which shows that Mn_(23)C_(6)is a good *** magnetic susceptibility analyses reveal a magnetization peak in the M-T curve at 104 K,combined with the M-H curve and Curie-Weiss law,this peak usually means the transformation between paramagnetic and antiferromagnetic *** gain an insight into the mechanism of the magnetic phase transition,we calculated the magnetic properties,and the results show that different from normal antiferromagnetic order,the magnetic orders in Mn_(23)C_(6)consist of three parts,the direct ferromagnetic and antiferromagnetic exchange coupling interactions between Mn atoms,and the indirect antiferromagnetic super-exchange interaction between Mn and C ***,we reveal that the Mn_(23)C_(6)is a complex magnetic competition system including different magnetic orders and interactions,instead of t

关键词： intermetallic compound(IMC) magnetism high temperature high pressure(HTHP) density functional theory(DFT)

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Detection of the Activity of 468861(2013 LU28)

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Research in Astronomy and Astrophysics 2025年第3期25卷 267-272页

作者： Xiao-Meng Xu Xi-Liang Zhang Yun-Zhao Wu Xiang-Yu Fan Purple Mountain Observatory Chinese Academy of Sciences School of Astronomy and Space Science University of Science and Technology of China Yunnan Observatories Chinese Academy of Sciences State Key Laboratory of Lunar and Planetary Sciences Macau University of Science and Technology University of Chinese Academy of Sciences

The perihelion of long-period comets places them near the Sun so they may exhibit *** 2013 LU28reached its perihelion,we performed a continuous observation to detect possible *** the Lijiang 2.4 m telescope with a Johnson R filter,we measured the brightness of 2013 LU28 from 2024 January 3 to April *** instrumental magnitudes were subsequently transformed into the Pan-STARRS r *** to the noticeable descending trend in the absolute magnitude,we verified the cometary activity and constrained some photometric properties of 2013 ***,the increased cross-sectional area had a rate of 42.8 km2day-1,and the corresponding mass-loss rate was 2.64 kg s-1with the assumption of a dust-particle size■ and the densityρ=400 kg *** estimated the nucleus radius as■ km for CO sublimation and■km for CO2sublimation and the grain size of 2013 LU28 was ■ for CO and■ for *** long-term observations provided in this paper will offer significant value for investigating the mechanisms driving the activity of 2013 LU28.

关键词： Kuiper Belt objects: individual (2013 LU28) minor planets, asteroids: individual (2013 LU28) techniques: photometric

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Generation and regulation of electromagnetic pulses induced by multi-petawatt laser coupling with gas jets

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Nuclear science and Techniques 2025年第6期36卷 136-149页

作者： Qiang-You He Zi-Tao Wang Zhi-Gang Deng Jie Feng Ya-Dong Xia Xi-Chen Hu Ming-Yang Zhu Jia-Jie Xie Zong-Qiang Yuan Zhi-Meng Zhang Feng Lu Lei Yang Hao Cheng Yu-Ze Li Yang Yan Yan-Lv Fang Chen-Tong Li Wei-Min Zhou Ting-Shuai Li Li-Ming Chen Chen Lin Xue-Qing Yan State Key Laboratory of Nuclear Physics and Technology and Key Laboratory of HEDP of the Ministry of EducationCAPTPeking UniversityBeijing 100871China National Key Laboratory of Plasma Physics Laser Fusion Research CenterChina Academy of Engineering PhysicsMianyang 621900China Key Laboratory for Laser Plasmas School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China Department of Plasma Physics and Fusion Engineering University of Science and Technology of ChinaHefei 230026China Beijing Laser Acceleration Innovation Center HuairouBeijing 101400China Institute of Guangdong Laser Plasma Technology BaiyunGuangzhou 510540China

High-power laser pulses interacting with targets can generate intense electromagnetic pulses(EMPs),which can disrupt physical experimental diagnostics and even damage diagnostic equipment,posing a threat to the reliable operation of *** this study,EMPs resulting from multi-petawatt laser irradiating nitrogen gas jets were systematically analyzed and *** experimental results revealed that the EMP amplitude is positively correlated with the quantity and energy of the electrons captured and accelerated by the plasma *** factors are reflected by parameters such as laser energy and nitrogen gas jet ***,we propose several potential sources of EMPs produced by laser-irradiated gas jets and separately analyzed their spatiotemporal *** findings provide insight into the mechanisms of EMP generation and introduce a new approach to achieve controllable EMPs by regulating the laser energy and gas jet pressure.

关键词： Electromagnetic pulses Multi-petawatt laser Gas jets Electrons

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Optimized online filter stack spectrometer for ultrashort X-ray pulses

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Nuclear science and Techniques 2024年第5期35卷 85-98页

作者： Jia-Xing Wen Ge Ma Ming-Hai Yu Yu-Chi Wu Yong-Hong Yan Shao-Yi Wang Huai-Zhong Gao Lu-Shan Wang Yu-Gang Zhou Qiang Li Yue Yang Fang Tan Xiao-Hui Zhang Jie Zhang Wen-Bo Mo Jing-Qin Su Wei-Min Zhou Yu-Qiu Gu Ming Zeng Zong-Qing Zhao Science and Technology on Plasma Physics Laboratory Laser Fusion Research CenterCAEPMianyang 621900China Department of Engineering Physics Tsinghua UniversityBeijing 100084China Key Laboratory of Particle and Radiation Imaging(Tsinghua University) Ministry of EducationBeijing 100084China School of Information Engineering Southwest University of Science and TechnologyMianyang 621010China

Currently,with the advent of high-repetition-rate laser-plasma experiments,the demand for online diagnosis for the X-ray spectrum is increasing because the laser-plasma-generated X-ray spectrum is very important for characterizing electron dynamics and *** this study,scintillators and silicon PIN(P-type–intrinsic-N-type semiconductor)diodes were used to construct a wideband online filter stack *** X-ray sensor and filter arrangement was optimized using a genetic algorithm to minimize the condition number of the response ***,the unfolding error was significantly reduced based on numerical *** detector responses were quantitatively calibrated by irradiating the scintillator and PIN diode with various nuclides and comparing the measuredγ-ray peaks.A prototype 15-channel spectrometer was developed by integrating an X-ray detector with front-and back-end *** prototype spectrometer could record X-ray pulse signals at a repetition rate of 1 ***,an optimized spectrometer was employed to record the real-time spectra of laser-driven bremsstrahlung *** optimized spectrometer offers a compact solution for spectrum diagnostics of ultrashort X-ray pulses,exhibiting improved accuracy in terms of spectrum measurements and repetition rates,and could be widely used in next-generation high-repetition-rate high-power laser facilities.

关键词： Filter stack spectrometer Laser plasma diagnostics X-ray diagnostics Scintillator PIN diode

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Enhanced Spatial Superresolution Using Engineered Spatial Modes 1

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International Conference on Photonics, PHOTONICS 2023

作者： Thachil, Jerin A. Kumar, Ashok Department of Physics Indian Institute of Space Science and Technology Thiruvananthapuram India

ISBN: (数字)9789819747603

ISBN: (纸本)9789819747597

Superresolution techniques allow us to achieve imaging resolution beyond the classical resolution limits. In this work, we propose that the existing precision limits can be further improved by engineering the spatial profile of photons used to probe the system. Here, we exploit the multi-parameter estimation theory to estimate simultaneously and optimally the centroid and object separation using spatially engineered modes as the measurement probe in a two-photon interference scheme. We model the light pulses with a Pearson type VII profile with arbitrary positive excess kurtosis and show that the achievable precision in simultaneous estimation of centroid and object separation can be improved over that of the Gaussian profile. The achievable precision also improves with increasing kurtosis value. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Photons

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Single exposure passive three-dimensional information reconstruction based on an ordinary imaging system

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Chinese physics B 2023年第11期32卷 446-455页

作者：窦申成刘璠李虎姚旭日刘雪峰翟光杰 Key Laboratory of Electronics and Information Technology for Space Systems National Space Science CenterChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Laboratory of Satellite Mission Operation National Space Science CenterChinese Academy of SciencesBeijing 100190China Center for Quantum Technology Research and Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements(MOE) School of PhysicsBeijing Institute of TechnologyBeijing 100081China Beijing Academy of Quantum Information Sciences Beijing 100193China

Existing three-dimensional(3D) imaging technologies have issues such as requiring active illumination, multiple exposures, or coding modulation. We propose a passive single 3D imaging method based on an ordinary imaging *** the point spread function of the imaging system to realize the non-coding measurement on the target, the full-focus images and depth information of the 3D target can be extracted from a single two-dimensional(2D) image through the compressed sensing algorithm. Simulation and experiments show that this approach can complete passive 3D imaging based on an ordinary imaging system without any coding operations. This method can achieve millimeter-level vertical resolution under single exposure conditions and has the potential for real-time dynamic 3D imaging. It improves the efficiency of 3D information detection, reduces the complexity of the imaging system, and may be of considerable value to the field of computer vision and other related applications.

关键词： passive three-dimensional imaging single exposure point spread function compressed sensing

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Quantum advantages for image filtering on images with efficient encoding and lower-bounded signal-to-noise ratio

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science China(physics,Mechanics & Astronomy) 2024年第9期67卷 2-12页

作者： Zidong Cui Shan Jin Akira Sone Xiaoting Wang Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610051China Key Laboratory of Quantum Physics and Photonic Quantum Information Ministry of EducationUniversity of Electronic Science and Technology of ChinaChengdu 611731China Department of Physics University of MassachusettsBoston 02125USA

Quantum image processing has long been a fascinating field,but establishing the existence of quantum speedup for all images remains *** this study,we aim to identify a subset of images for which a quantum algorithm can be developed with a guaranteed ***,we present a quantum image filtering algorithm that exhibits an exponential speedup for efficiently encoded images with a lower-bounded signal-to-noise *** approach relies on a fixed-point Grover's search to emulate the effect of Hadamard multiplication with the filtering *** demonstrate its effectiveness,we apply our method to three typical filtering ***,we emphasize the significance of the efficient-encoding assumption by illustrating that the quantum speedup may diminish for images lacking efficient *** work underscores the importance of exploring image types and features to realize potential quantum advantages in image processing.

关键词： quantum computing quantum image filtering quantum speedup

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High-efficiency wide-angle anomalous refraction with acoustic metagrating

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Chinese physics B 2025年第1期34卷 368-372页

作者： Kangyao Sun Yuancheng Fan Zhehao Ye Jiahui Li Quanhong Fu Yali Zeng Fuli Zhang MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions School of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710129China

The emergent metagrating,with its unique and flexible beam shaping capabilities,offers new paths to efficient modulation of acoustic *** this work,an acoustic metagrating is demonstrated for high-efficiency and wide-angle anomalous *** is shown that the normal reflection and transmission can be totally suppressed by properly modulating the amplitude and phase characteristics of the metagrating supercells for high-efficiency anomalous *** anomalous refraction behavior is achieved in the wide range of incident angles from 28°to 78°,and the efficiency of-1st order diffraction is higher than 90%by finely designing the metagrating *** anomalous refraction behaviors are verified experimentally at incidence angle of 28°,45°,and 78°,*** demonstrated metagrating is anticipated to possess efficient wide-angle composite wavefront engineering applications in such fields as communications.

关键词： acoustic metagrating beam steering wide-angle anomalous refraction

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Regulation of Ionic Bond in GroupⅡB Transition Metal Iodides

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Chinese physics Letters 2023年第7期40卷 40-44页

作者：徐真真李建福耿延雷张钊斌吕阳张超王庆林王晓丽 School of Physics and Electronic Information Yantai UniversityYantai 264005China Shandong Key Laboratory of Optical Communication Science and Technology School of Physics Science&Information TechnologyLiaocheng UniversityLiaocheng 252059China

Using a swarm intelligence structure search method combining with first-principles calculations,three new structures of Zn-I and Hg-I compounds are discovered and pressure-composition phase diagrams are *** interesting phenomenon is found,that is,the compounds that are stable at 0 GPa in both systems will decompose into their constituent elements under certain pressure,which is contrary to the general intuition that pressure always makes materials more stability and density.A detailed analysis of the decomposition mechanism reveals the increase of formation enthalpy with the increase of pressure due to contributions from bothΔU andΔ[P V].Pressure-dependent studies of theΔV demonstrate that denser materials tend to be stabilized at higher ***,charge transfer calculations show that external pressure is more effective in regulating the ionic bond of Hg-I,resulting in a lower decomposition pressure for HgI_(2)than for ZnI_(2).These findings have important implications for designs and syntheses of new materials,as they challenge the conventional understanding on how pressure affects stability.

关键词： stability. density. Transition

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On the generation of high-quality Nyquist pulses in mode-locked fiber lasers

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Chinese physics B 2024年第3期33卷 424-427页

作者：任俞宣葛锦蔓李小军彭俊松曾和平 State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China National Key Laboratory of Science and Technology on Space Microwave China Aerospace Science and TechnologyXi'an 710100China Chongqing Key Laboratory of Precision Optics Chongqing Institute of East China Normal UniversityChongqing 401120China Jinan Institute of Quantum Technology Jinan 250101China

Nyquist pulses have wide applications in many areas,from electronics to ***-locked lasers are ideal platforms to generate such ***,how to generate high-quality Nyquist pulses in mode-locked lasers remains *** address this problem by managing different physical effects in mode-locked fiber lasers through extensive numerical *** find that net dispersion,linear loss,gain and filter shaping can affect the quality of Nyquist pulses *** also demonstrate that Nyquist pulses experience similariton shaping due to the nonlinear attractor effect in the gain *** work may contribute to the design of Nyquist pulse sources and enrich the understanding of pulse shaping dynamics in mode-locked lasers.

关键词： mode locking laser soliton fiber pulse

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