检索结果-南通市图书馆

Physical Properties Revealed by Transport Measurements for Superconducting Nd_(0.8)Sr_(0.2)NiO_(2) Thin Films

Chinese Physics Letters 2021年第4期38卷 103-110页

作者： Ying Xiang Qing Li Yueying Li Huan Yang yuefeng nie Hai-Hu Wen National Laboratory of Solid State Microstructures and Department of Physics Center for Superconducting Physics and MaterialsCollaborative Innovation Center for Advanced MicrostructuresNanjing UniversityNanjing 210093China National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied SciencesCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

The newly discovered superconductivity in infinite-layer nickelate superconducting films has attracted much attention,largely because their crystalline and electronic structures are similar to those of high-T_(c) cuprate *** upper critical field can provide a great deal of information on the subject of superconductivity,but detailed experimental data are still lacking for these *** present the temperature-and angle-dependence of resistivity,measured under different magnetic fields H in Nd_(0.8)Sr_(0.2)NiO_(2) thin *** onset superconducting transition occurs at about 16.2 K at 0 ***-dependent upper critical fields,determined using a criterion very close to the onset transition,show a clear negative curvature near the critical transition temperature,which can be explained as a consequence of the paramagnetically limited effect on *** temperaturedependent anisotropy of the upper critical field is obtained from resistivity data,which yields a value decreasing from 3 to 1.2 with a reduction in *** can be explained in terms of the variable contribution from the orbital limit effect on the upper critical *** angle-dependence of resistivity at a fixed temperature,and at different magnetic fields,cannot be scaled to a curve,which deviates from the prediction of the anisotropic Ginzburg-Landau ***,at low temperatures,the resistance difference can be scaled via the parameter H^(β)| cos θ|(β=6-1),with θ being the angle enclosed between the c-axis and the applied magnetic *** the first detailed study of the upper critical field of nickelate thin films,our results clearly indicate a small anisotropy,and a paramagnetically limited effect,in terms of superconductivity,in nickelate superconductors.

关键词： temperature. field. theory.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Charge density wave and weak Kondo effect in a Dirac semimetal CeSbTe

引用

Science China(Physics,Mechanics & Astronomy) 2021年第3期64卷 90-98页

作者： Peng Li BaiJiang Lv Yuan Fang Wei Guo ZhongZheng Wu Yi Wu DaWei Shen yuefeng nie Luca Petaccia Chao Cao Zhu-An Xu Yang Liu Zhejiang Province Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang UniversityHangzhou 310027China Center for Correlated Matter Zhejiang UniversityHangzhou 310058China National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesNanjing UniversityNanjing 210093China State Key Laboratory of Functional Materials for Informatics and Center for Excellence in Superconducting Electronics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China Elettra Sincrotrone Trieste Strada Statale 14 km 163.5Trieste 34149Italy Department of Physics Hangzhou Normal UniversityHangzhou 310036China

Using angle-resolved photoemission spectroscopy(ARPES) and low-energy electron diffraction(LEED), together with densityfunctional theory(DFT) calculation, we report the formation of charge density wave(CDW) and its interplay with the Kondo effect and topological states in CeSbTe. The observed Fermi surface(FS) exhibits parallel segments that can be well connected by the observed CDWordering vector, indicating that the CDWorder is driven by the electron-phonon coupling(EPC) as a result of the nested FS. The CDW gap is large(~0.3 eV) and momentum-dependent, which naturally explains the robust CDWorder up to high temperatures. The gap opening leads to a reduced density of states(DOS) near the Fermi level(EF), which correspondingly suppresses the many-body Kondo effect, leading to very localized 4 f electrons at 20 K and above. The topological Dirac cone at the X point is found to remain gapless inside the CDW phase. Our results provide evidence for the competition between CDWand the Kondo effect in a Kondo lattice system. The robust CDWorder in CeSbTe and related compounds provide an opportunity to search for the long-sought-after axionic insulator.

关键词： charge density wave Kondo effect Dirac semimetal

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Halide vapor phase epitaxy of monolayer molybdenum diselenide single crystals

引用

National Science Open 2023年第4期2卷 55-64页

作者： Taotao Li Yang Yang Liqi Zhou Wenjie Sun Weiyi Lin Lei Liu Xilu Zou Si Gao yuefeng nie Yi Shi Xinran Wang National Laboratory of Solid State Microstructures School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China School of Electronic Science and Engineering Xiamen UniversityXiamen 361005China College of Material Science and Engineering Nanjing Tech UniversityNanjing 201110China School of Integrated Circuits Nanjing UniversitySuzhou 215163China Suzhou Laboratory Suzhou 215000China

Single-crystalline transition metal dichalcogenides(TMD)films are of potential application in future electronics and *** this work,a halide vapor phase epitaxy(HVPE)strategy was proposed and demonstrated for the epitaxy of molybdenum diselenide(MoSe_(2))single crystals,in which metal halide vapors were in-situ produced by the chlorination of molybdenum as sources for the TMD *** with the epitaxial sapphire substrate,unidirectional domain alignment was successfully achieved and monolayer single-crystal MoSe_(2) films have been demonstrated on a 2-inch wafer for the first time.A series of characterizations ranging from centimeter to nanometer scales have been implemented to demonstrate the high quality and uniformity of the MoSe_(2).This work provides a universal strategy for the growth of TMD single-crystal films.

关键词： halide vapor phase epitaxy single-crystal molybdenum diselenide 2D semiconductor wafer-scale

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

PREPARATION, STRUCTURE, AND MAGNETIC PROPERTIES OF LA1-XCAXMNO3(X=0, 0.1, 0.2, 0.3,0.4,0.5) NANOCRYSTALLINE POWDERS AND CERAMIC

PREPARATION, STRUCTURE, AND MAGNETIC PROPERTIES OF LA1-XCAXM...

引用

第8届国际材联电子材料国际研讨会

作者： Yin Lisong, nie yuefeng, Zhang Jinxiu Department of physics, Zhongshan University, Guangzhou, 510275, China South Center University, Changsha, Hunan 410075, Chian

A series of perovskite LaCaMnO (x=0, 0.1, 0.2, 0.3, 0.4, 0.5) nano-crystalline powders and ceramic were prepared by Sol-gel process. The structure and properties have been characterized by XRD and magnetization measur...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Nd掺杂HfO_(2)薄膜的分子束外延制备及铁电性

引用

硅酸盐学报 2023年第12期51卷 3039-3045页

作者：刘育玮矫佩杰茆伟杨江枫郑宁冲王鹏吴迪聂越峰南京大学现代工程与应用科学学院固体微结构物理国家重点实验室江苏省功能材料设计原理与应用技术重点实验室南京210093 华威大学物理系英国考文垂CV47AL

掺杂Hf O_(2)铁电薄膜在非易失性存储器件中的重要应用前景使其成为当前凝聚态物理与材料科学领域的一个研究热点。近年来,结果表明:La掺杂Hf O_(2)拥有优异的铁电性能,铁电剩余极化强度为45μC/cm~2,是目前Hf O_(2)基薄膜材料中报道的... 详细信息

掺杂Hf O_(2)铁电薄膜在非易失性存储器件中的重要应用前景使其成为当前凝聚态物理与材料科学领域的一个研究热点。近年来,结果表明:La掺杂Hf O_(2)拥有优异的铁电性能,铁电剩余极化强度为45μC/cm~2,是目前Hf O_(2)基薄膜材料中报道的最高值。由于Nd与La的化学性质相近,Nd掺杂同样有望增强HfO_(2)的铁电性,但相关研究工作却鲜有报道。使用氧化物分子束外延技术,在La_(0.67)Sr_(0.33)Mn O_(3)(底电极)/SrTiO_(3)(001)衬底上外延生长高质量Nd掺杂Hf O_(2)(Nd:HfO_(2))薄膜。X射线衍射以及高分辨电镜表征结果均显示Nd掺杂有助于诱导Hf O_(2)从单斜相向正交相的转变,压电力显微镜和铁电测试仪进一步证实正交相Nd:Hf O_(2)具有良好的铁电性。此外,高分辨电子显微镜表征还发现Nd:Hf O_(2)靠近界面处存在四方相结构,衔接(111)晶向的Nd:Hf O_(2)和(001)晶向的钙钛矿氧化物衬底。Nd:Hf O_(2)薄膜的外延生长和铁电性的系统研究,扩充了掺杂Hf O_(2)的研究体系。

关键词：氧化铪铁电分子束外延掺杂

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Discovering context-aware conditional functional dependencies

引用

Frontiers of Computer Science 2017年第4期11卷 688-701页

作者： yuefeng DU Derong SHEN Tiezheng nie Yue KOU Ge YU College of Information Science and Engineering Northeastern University Shenyang 110819 China

Conditional functional dependencies（CFDs） are important techniques for data consistency. However, CFDs are limited to 1） provide the reasonable values for consistency repairing and 2） detect potential errors. This paper presents context-aware conditional functional dependencies（CCFDs） which contribute to provide reasonable values and detect po- tential errors. Especially, we focus on automatically discov- ering minimal CCFDs. In this paper, we present context rela- tivity to measure the relationship of CFDs. The overlap of the related CFDs can provide reasonable values which result in more accuracy consistency repairing, and some related CFDs are combined into CCFDs. Moreover, we prove that discover- ing minimal CCFDs is NP-complete and we design the pre- cise method and the heuristic method. We also present the dominating value to facilitate the process in both the precise method and the heuristic method. Additionally, the context relativity of the CFDs affects the cleaning results. We will give an approximate threshold of context relativity accord- ing to data distribution for suggestion. The repairing results are approved more accuracy, even evidenced by our empirical evaluation.

关键词： conditional functional dependencies contextaware rules discovery

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A spin-based magnetic scanning microscope for in-situ strain tuning of soft matter

引用

Chinese Physics B 2023年第5期32卷 102-107页

作者：丁哲孙豫蒙王孟祺余佩郑宁冲臧一鹏王鹏飞王亚聂越峰石发展杜江峰 CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China Jiangsu Key Laboratory of Artificial Functional Materials Nanjing UniversityNanjing 210093China College of Engineering and Applied Science Nanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China School of Biomedical Engineering and Suzhou Institute for Advanced Research University of Science and Technology of ChinaSuzhou 215123China

We present a magnetic scanning microscope equipped with a nitrogen-vacancy(NV) center scanning probe that has the ability to mechanically tune the strain of soft matter in-situ. The construction of the microscope and a continuous straintuning sample holder are discussed. An optically detected magnetic resonance protocol utilized in the imaging is *** order to show the reliability of this microscope, the strain conduction is estimated with finite element simulation, and xray diffraction is required for calibration when freestanding crystal films are under consideration. A magnetic imaging result is displayed to demonstrate the nano-scale imaging capability. The microscope presented in this work is helpful in studying strain-coupled magnetic physics such as magnetic phase transition under strain and strain-tuned cycloidal orientation tilting.

关键词： nitrogen-vacancy(NV)center antiferromagnetism strain tuning soft matter

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

多维度护理加术后早期活动对腹腔镜肝癌切除术患者的影响

引用

中国医药指南 2024年第18期22卷 126-128页

作者：陈丽仙兰月凤聂凤燕福建省立医院14区肝胆胰外科福州350001 福建省立医院心血管外科福州350001

目的针对腹腔镜肝癌切除术患者,引入多维度护理加术后早期活动护理方案,观察其临床应用效果。方法研究以腹腔镜肝癌切除术患者为观察对象,共60例参与,均为2021年6月至2023年6月临床收治患者,入组后以护理模式的差异将患者分组,观察组(n=... 详细信息

目的针对腹腔镜肝癌切除术患者,引入多维度护理加术后早期活动护理方案,观察其临床应用效果。方法研究以腹腔镜肝癌切除术患者为观察对象,共60例参与,均为2021年6月至2023年6月临床收治患者,入组后以护理模式的差异将患者分组,观察组(n=30)实行多维度护理加术后早期活动护理,对照组(n=30)实行常规护理,以术后恢复指标,并发症发生率,应激反应、胃肠功能指标改善情况为观察项目,对比不同护理方案的临床作用。结果观察组术后恢复时间低于对照组(P<0.05);观察组术后并发症发生率低于对照组(P<0.05);术后3 d,观察组皮质醇(Cor)、C反应蛋白(CRP)、白细胞计数值水平均低于对照组(P<0.05);术后3 d,观察组胃泌素(GAS)、胃动素(MTL)水平均高于对照组(P<0.05)。结论将多维度护理加术后早期活动护理应用于腹腔镜肝癌切除术患者中,可有效降低术后并发症发生率,减轻应激反应,避免患者胃肠功能受到严重影响,促进患者的术后恢复。

关键词：腹腔镜肝癌切除术多维度护理术后早期活动术后并发症

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis of disk-rod-disk liquid crystal trimers by using click chemistry

引用

Science China Chemistry 2010年第5期53卷 1133-1140页

作者： Yu, WenHao nie, ShiChang Bai, yuefeng Jing, Yang Wang, BiQin Hu, Ping Zhao, KeQing College of Chemistry and Material Science Sichuan Normal University Chengdu 610066 China

A series of disk-rod-disk liquid crystal trimers were ***-NEt3 catalyzed alkyne azide cycloaddition in toluene at room temperature connected two triphenylene discogens to a biphenyl rod-shaped *** trimers were characterized by using 1H NMR,IR,and high resolution mass *** mesomorphic properties were investigated using polarized optical microscopy(POM) ,differential scanning calorimetry(DSC) ,and wide-angle X-ray *** results showed that the trimers exhibited rectangular columnar mesophase(Colr) .The length of the flexible spacer connecting the three segments has prominent influence on the phase transition temperatures of the trimers.

关键词： liquid crystal trimer triphenylene rectangular columnar mesophase click chemistry copper(Ⅰ) catalyzed alkyne azide cycloaddition

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Removing the Intrinsic NiO Phase and Residual Lithium for High-Performance Nickel-Rich Materials

引用

Energy Material Advances 2023年第1期4卷 1-11页

作者： Feng Wu Jinyang Dong Lai Chen Gang Chen Qi Shi Yuanlin nie Yun Lu Liying Bao Ning Li Tinglu Song Shi Chen yuefeng Su Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081PR China Beijing Institute of Technology Chongqing Innovation Center Chongqing401120China Lenovo(Beijing)Co.Ltd. Beijing100094China Experimental Center of Advanced Materials School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081PR China

Layered Ni-rich materials for lithium-ion batteries exhibit high discharge capacities but degraded cyclability at the same *** limited cycling stability originates from many *** of the critical factors is the intrinsic insulating residual lithium compounds and the rock-salt(NiO)phase on the surface of *** this work,LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) material is etched with a trace amount of boric acid and used as a model to demonstrate the influences of weak acid treatment on the surface phase *** the etching process,the pH of the material is reduced from 12.08 to 11.82,along with a lower cation mixing degree and promoting electrochemical *** measurements demonstrate that weak acids such as H_(3)BO_(3) can also etch the NiO phase on the surface to adjust the surface of the particles to a pure layered *** process improves the lithium-ion diffusion and electron transport in the interface between material and electrolyte,consequently leading to better cycling performance and rate *** study provides a novel strategy and comprehensive understanding of acid modification and surface phase regulation process of Ni-rich cathode materials for lithium-ion batteries.

关键词： cycling lithium moving

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：