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Anisotropic transport properties and topological Hall effect in the annealed kagome antiferromagnet FeGe

Science China(Physics,Mechanics & Astronomy) 2025年

作者： Jiajun Ma Chenfei Shi Yantao Cao Yuwei Zhang Yazhou Li Jiaxing Liao Jialu Wang Wenhe Jiao Hanjie Guo chenchao xu Shixun Cao Jianhui Dai Jin-Ke Bao Yuke Li School of Physics Hangzhou Key Laboratory of Quantum Matters Hangzhou Normal University Department of Physics Materials Genome Institute and International Center for Quantum and Molecular StructuresShanghai University Songshan Lake Materials Laboratory School of Physical Science and Technology Lanzhou University Key Laboratory of Quantum Precision Measurement of Zhejiang Province Department of Applied PhysicsZhejiang University of Technology

Electron correlation often gives birth to various orders in quantum materials. Recently, a strongly correlated kagome antiferromagnet FeGe is discovered to undergo a charge density wave transition inside the A-type antiferromagnetic state, providing an opportunity to explore the interplay between charge order and magnetism. Here, we reported the observation of anisotropic resistivity and Hall effect, along with a topological Hall effect, in the annealed FeGe crystals. As the current flows along the abplane, the temperature dependence of ρabexhibits a distinct resistivity loop related to a first-order transition at Tcdw. The applied magnetic fields do not alter Tcdwbut can induce a spin-flop transition at Hsf. Consequently, a field-induced large topological Hall effect is observed in the canting antiferromagnetic（CAFM） state below Tcant, which is possibly attributed to the non-trivial spin texture during the spin-flop process. Whereas, as current is parallel to c-axis, both the field-induced transitions in ρcand χcdisappear. Instead, the Hall resistivity in the annealed FeGe significantly exhibits a deviation from the linear *** findings provide valuable insight into revealing the interplay among magnetism, charge order and topology in the kagome magnets.

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Coexistence of nontrivial topological properties and strong ferromagnetic fluctuations in quasi-one-dimensional A_(2)Cr_(3)As_(3)

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npj Computational Materials 2020年第1期6卷 1413-1420页

作者： chenchao xu Ninghua Wu Guo-Xiang Zhi Bing-Hua Lei xu Duan Fanlong Ning Chao Cao Qijin Chen Department of Physics Zhejiang University310027 HangzhouChina CAS Key Laboratory of Functional Materials and Devices for Special Environments Xinjiang Technical Institute of Physics and ChemistryCASXinjiang Key Laboratory of Electronic Information Materials and Devices40-1 South Beijing Road830011 UrumqiChina Condensed Matter Group Department of PhysicsHangzhou Normal University311121 HangzhouChina Westlake University HangzhouZhejiangChina Department of Physics Fudan UniversityShanghaiChina Collaborative Innovation Center of Advanced Microstructures Nanjing University210093 NanjingChina Shanghai Branch National Laboratory for Physical Sciences at Microscale and Department of Modern PhysicsUniversity of Science and Technology of China201315 ShanghaiChina

Superconductivity in crystals without inversion symmetry has received extensive attention due to its unconventional pairing and possible nontrivial topological *** first-principles calculations,we systemically study t... 详细信息

关键词： properties nontrivial topological

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Coexistence of superconductivity and antiferromagentic order in Er_(2)O_(2)Bi with anti-ThCr_(2)Si_(2) structure

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Frontiers of physics 2021年第6期16卷 133-141页

作者： Lei Qiao Ning-hua Wu Tianhao Li Siqi Wu Zhuyi Zhang Miaocong Li Jiang Ma Baijiang Lv Yupeng Li chenchao xu Qian Tao Chao Cao Guang-Han Cao Zhu-An xu Zhejiang Province Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang UniversityHangzhou 310027China Key Laboratory of Neutron Physics and Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621999China Department of Physics Hangzhou Normal UniversityHangzhou 310036China State Key Laboratory of Silicon Materials Zhejiang UniversityHangzhou 310027China

We investigated the coexistence of superconductivity and antiferromagnetic order in the compound Er_(2)O_(2)Bi with anti-ThCr_(2)Si_(2)-type structure through resistivity,magnetization,specific heat measurements and first-principle *** superconducting transition temperature Tc of 1.23 K and antiferromagnetic transition temperature TN of 3 K are observed in the sample with the best nominal *** superconducting upper critical field H_(c2)(0)and electron-phonon coupling constantλe−ph in Er_(2)O_(2)Bi are similar to those in the previously reported non-magnetic superconductor Y_(2)O_(2)Bi with the same structure,indicating that the superconductivity in Er_(2)O_(2)Bi may have the same origin as in Y_(2)O_(2)*** first-principle calculations of Er_(2)O_(2)Bi show that the Fermi surface is mainly composed of the Bi 6p orbitals both in the paramagnetic and antiferromagnetic state,implying minor effect of the 4f electrons on the Fermi ***,upon increasing the oxygen incorporation in Er_(2)O_(x)Bi,Tc increases from 1 to 1.23 K and TN decreases slightly from 3 K to 2.96 K,revealing that superconductivity and antiferromagnetic order may compete with each *** Hall effect measurements indicate that hole-type carrier density indeed increases with increasing oxygen content,which may account for the variations of Tc and TN with different oxygen content.

关键词： superconductivity Kondo lattice magnetic correlation phase diagram

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国王在英法早期改宗基督教中的作用比较

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绍兴文理学院学报 2012年第6期32卷 36-41页

作者：徐晨超华东师范大学历史系上海200241

从多神教到基督教,日耳曼人各支系皈依的过程可谓殊途同归。其中盎格鲁-撒克逊人和法兰克人两支部族的改宗都是由王室贵族发起,自上而下推广普及的宗教变革。在此过程中,国王既是决策者,也是推动者。该文从国王的角度切入,就盎格鲁-撒... 详细信息

从多神教到基督教,日耳曼人各支系皈依的过程可谓殊途同归。其中盎格鲁-撒克逊人和法兰克人两支部族的改宗都是由王室贵族发起,自上而下推广普及的宗教变革。在此过程中,国王既是决策者,也是推动者。该文从国王的角度切入,就盎格鲁-撒克逊人和法兰克人皈依基督教的历史作几点异同的比较。主要从三个方面进行探讨:一是国王的宗教威望的来源与演化,二是改宗的困难和国王采取的相应的宗教政策,三是两地的王权在改宗中起到作用的差异。

关键词：盎格鲁-撒克逊人法兰克人国王改宗

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厌氧氨氧化研究的分子生态学进展

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浙江大学学报（农业与生命科学版） 2019年第2期45卷 135-142页

作者：朱辰张乃方徐陈超张凯杭程磊浙江大学生命科学学院生命系统稳态与保护教育部重点实验室杭州310058

厌氧氨氧化(anaerobic ammonium oxidation, ANAMMOX)通常指微生物在厌氧条件下,以亚硝酸根为电子受体,将铵根离子氧化成氮气的过程,主要由浮霉菌门(Planctomycetales)细菌驱动。厌氧氨氧化菌广泛分布于陆地与海洋生态系统里,在全球氮... 详细信息

厌氧氨氧化(anaerobic ammonium oxidation, ANAMMOX)通常指微生物在厌氧条件下,以亚硝酸根为电子受体,将铵根离子氧化成氮气的过程,主要由浮霉菌门(Planctomycetales)细菌驱动。厌氧氨氧化菌广泛分布于陆地与海洋生态系统里,在全球氮循环中发挥着重要的作用。本文综合分析了在群落水平、细胞水平、分子和组学水平下厌氧氨氧化过程的生态学研究进展,结合不同尺度下的方法与技术介绍,初步探讨和展望了不同生态系统中厌氧氨氧化的前沿问题与研究方向。

关键词：厌氧氨氧化过程方法与技术代谢途径

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法兰克公主贝尔莎出嫁时间考析

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绍兴文理学院学报 2014年第6期34卷 107-110页

作者：徐晨超浙江工业职业技术学院人文社科部浙江绍兴312000

贝尔莎是第一位持基督教信仰嫁到肯特的法兰克公主,西方史学界对其出嫁时间一直存有争议。由于牵连到法兰克王室在盎格鲁-撒克逊人改宗中的作用问题,这一争议的研究价值不容忽视。结合第一手的编年史、信件等史料,就学界近年来的观点进... 详细信息

贝尔莎是第一位持基督教信仰嫁到肯特的法兰克公主,西方史学界对其出嫁时间一直存有争议。由于牵连到法兰克王室在盎格鲁-撒克逊人改宗中的作用问题,这一争议的研究价值不容忽视。结合第一手的编年史、信件等史料,就学界近年来的观点进行回顾、梳理、分析,主要针对贝尔莎出嫁时间,以及肯特、墨洛温王室与罗马之间的联系展开讨论。该文认为,近年来认为575-581年间贝尔莎出嫁的观点缺少史料支撑,有待商榷,贝尔莎很可能在560年之前就已成婚。

关键词：贝尔莎出嫁时间改宗

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黄炎培教育家精神的源流、特质与当代价值

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教育与职业 2024年第20期1068卷 94-101页

作者：徐晨超冯旭芳齐林明浙江工业职业技术学院马克思主义学院浙江绍兴312000 浙江工业职业技术学院教务处浙江绍兴312000 浙江省中华职业教育社教育科研工作委员会浙江工业职业技术学院公共基础教学部浙江绍兴312000

教育家精神在黄炎培先生为职教事业奋斗的一生中多有生动体现。黄炎培的教育家精神承袭于中华优秀传统文化,成长于近代教育救国浪潮,实践于艰难的教育环境,滋养于马克思主义真理。黄炎培“身非我有”“鬻字疗贫”“手脑并用,做学合一”... 详细信息

教育家精神在黄炎培先生为职教事业奋斗的一生中多有生动体现。黄炎培的教育家精神承袭于中华优秀传统文化,成长于近代教育救国浪潮,实践于艰难的教育环境,滋养于马克思主义真理。黄炎培“身非我有”“鬻字疗贫”“手脑并用,做学合一”“行必踏实,理必求真”“敬业乐群”“全人类一体”的精神特质对教育家精神在理想信念、道德情操、育人智慧、躬耕态度、仁爱之心、弘道追求等方面做出了真实诠释。新时代职业教育工作者应充分挖掘并弘扬黄炎培的教育家精神,进一步筑牢报国弘道的理想追求,弘扬律己爱生的师德仁心,造就启智创新的良匠之师。

关键词：黄炎培教育家精神源流特质当代价值

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Effect of Paclobutrazol on Distribution Relation Between Different Organs of Japonica Rice under Direct Seeding Model

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Agricultural Science & Technology 2017年第1期18卷 12-14,55页

作者： Zenghong LI Chengguo JIANG Cuiping SHEN chenchao xu Jinshan Agricultural Technology Extension Center Jinshan 201599 China

Three japonica rice varieties were soaked in 110 mg/L paclobutrazol solution for 48 h and then directly seeded, and seeds soaked with clean water were used as a control group. The analysis of dry weights of various organs and agronomic traits showed that soaking of japonica seeds with paclobutrazol had little impact on the correlation between dry weights of various organs, but there were still significant differences between cultivars. The correlation coefficients between lengths of the first and second nodes with filled grain weight changed from 0.024 and 0.056 in the CK to -0.116 and -0.042 correspondingly after presoaking with paclobutrazol. Therefore, paclobutrezol reduces the effect of stem-sheath weight on filled grain weight, and as a result, photosynthetic product could not be effectively transported in maturation stage of rice.

关键词： Correlation Paclobutrazol Reproductive allocation Organ Dry weight

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Enantio-divergent C–H borylation with two different ligands from a single chiral source

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Science China Chemistry 2025年第1期68卷 226-232页

作者： Rongrong Du Senmiao xu State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical Physics Chinese Academy of Sciences College of Material Chemistry and Chemical Engineering Key Laboratory of Organosilicon Chemistry and Material TechnologyMinistry of Education Hangzhou Normal University University of Chinese Academy of Sciences

Reported here is an iridium-catalyzed enantio-divergent C（sp3）–H borylation of α-gem-dimethyl groups of trifluoromethyl ketone-derived hydrazones to construct a series of acyclic all-carbon quaternary stereocenters with a high level of chiral induction. Two different chiral bidentate boryl ligands from a common chiral source not only can switch the enantioselectivity but also are complementary in terms of the substrate scope.

关键词： asymmetric catalysis C–H borylation all-carbon quaternary stereocenters synthetic methods

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Aquaporin-4-IgG-seropositive neuromyelitis optica spectrum disorders:progress of experimental models based on disease pathogenesis

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Neural Regeneration Research 2025年第2期20卷 354-365页

作者： Li xu Huiming xu Changyong Tang Department of Neurology The Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhouGuangdong ProvinceChina

Neuromyelitis optica spectrum disorders are neuroinflammatory demyelinating disorders that lead to permanent visual loss and motor *** date,no effective treatment exists as the exact causative mechanism remains ***,experimental models of neuromyelitis optica spectrum disorders are essential for exploring its pathogenesis and in screening for therapeutic *** most patients with neuromyelitis optica spectrum disorders are seropositive for IgG autoantibodies against aquaporin-4,which is highly expressed on the membrane of astrocyte endfeet,most current experimental models are based on aquaporin-4-IgG that initially targets *** experimental models have successfully simulated many pathological features of neuromyelitis optica spectrum disorders,such as aquaporin-4 loss,astrocytopathy,granulocyte and macrophage infiltration,complement activation,demyelination,and neuronal loss;however,they do not fully capture the pathological process of human neuromyelitis optica spectrum *** this review,we summarize the currently known pathogenic mechanisms and the development of associated experimental models in vitro,ex vivo,and in vivo for neuromyelitis optica spectrum disorders,suggest potential pathogenic mechanisms for further investigation,and provide guidance on experimental model *** addition,this review summarizes the latest information on pathologies and therapies for neuromyelitis optica spectrum disorders based on experimental models of aquaporin-4-IgG-seropositive neuromyelitis optica spectrum disorders,offering further therapeutic targets and a theoretical basis for clinical trials.

关键词： aquaporin-4 experimental model neuromyelitis optica spectrum disorder pathogenesis

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