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Evolution of Superconducting-Transition Temperature with Superfluid Density and Conductivity in Pressurized Cuprate Superconductors 被引量:1
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作者 赵金瑜 蔡树 +15 位作者 陈逸雯 顾根大 闫宏涛 郭静 韩金宇 王鹏玉 周亚洲 李延春 李晓东 任治安 吴奇 周兴江 丁阳 向涛 毛河光 孙力玲 《Chinese Physics Letters》 SCIE EI CAS CSCD 2024年第4期110-117,共8页
What factors fundamentally determine the value of superconducting transition temperature Tc in high temperature superconductors has been the subject of intense debate.Following the establishment of an empirical law kn... What factors fundamentally determine the value of superconducting transition temperature Tc in high temperature superconductors has been the subject of intense debate.Following the establishment of an empirical law known as Homes'law,there is a growing consensus in the community that the Tc value of the cuprate superconductors is closely linked to the superfluid density(ρ_(s))of its ground state and the conductivity(σ)of its normal state.However,all the data supporting this empirical law(ρ_(s)=AσT_(c))have been obtained from the ambientpressure superconductors.In this study,we present the first high-pressure results about the connection of the quantities of ρ_(s) and σ with T_(c),through the studies on the Bi_(1.74)Pb_(0.38)Sr_(1.88)CuO_(6+δ)and Bi_(2)Sr_(2)CaCu_(2)O_(8+δ),in which the value of their high-pressure resistivity(ρ=1/σ)is achieved by adopting our newly established method,while the quantity ofρs is extracted using Homes'law.We highlight that the Tc values are strongly linked to the joint response factors of magnetic field and electric field,i.e.,ρ_(s) and σ,respectively,implying that the physics determining T_(c) is governed by the intrinsic electromagnetic fields of the system. 展开更多
关键词 SUPERCONDUCTORS TRANSITION CONDUCTIVITY
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Absence of BCS–BEC crossover in FeSe_(0.45)Te_(0.55) superconductor
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作者 贾俊杰 谷亚东 +21 位作者 殷超辉 束英杰 陈逸雯 史聚民 张杏 陈浩 苗泰民 任晓琳 梁波 朱文培 蔡能 张丰丰 张申金 杨峰 王志敏 彭钦军 许祖彦 毛寒青 刘国东 任治安 赵林 周兴江 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第7期79-85,共7页
In iron-based superconductor Fe(Se,Te), a flat band-like feature near the Fermi level was observed around the Brillouin zone center in the superconducting state. It is under debate whether this is the evidence on the ... In iron-based superconductor Fe(Se,Te), a flat band-like feature near the Fermi level was observed around the Brillouin zone center in the superconducting state. It is under debate whether this is the evidence on the presence of the BCS–BEC[Bardeen–Cooper–Schrieffer(BCS), Bose–Einstein condensation(BEC)] crossover in the superconductor. High-resolution laser-based angle-resolved photoemission measurements are carried out on high quality single crystals of FeSe_(0.45)Te_(0.55) superconductor to address the issue. By employing different polarization geometries, we have resolved and isolated the dyz band and the topological surface band, making it possible to study their superconducting behaviors separately. The dyz band alone does not form a flat band-like feature in the superconducting state and the measured dispersion can be well described by the BCS picture. We find that the flat band-like feature is formed from the combination of the dyz band and the topological surface state band in the superconducting state. These results reveal the origin of the flat band-like feature and rule out the presence of BCS-BEC crossover in Fe(Se,Te) superconductor. 展开更多
关键词 FeSe_(0.45)Te_(0.55) ARPES electronic structure superconducting gap BCS–BEC crossover
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Negligible normal fluid in superconducting state of heavily overdoped Bi_(2)Sr_(2)CaCu_(2)O_(8+δ) detected by ultra-low temperature angle-resolved photoemission spectroscopy
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作者 殷超辉 汪清泓 +23 位作者 解于洋 陈逸雯 刘俊豪 杨鉴刚 贾俊杰 张杏 吕文凯 闫宏涛 戎洪涛 张申金 王志敏 宗楠 刘丽娟 李如康 王晓洋 张丰丰 杨峰 彭钦军 许祖彦 刘国东 毛寒青 赵林 李昕彤 周兴江 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第7期562-567,共6页
In high temperature cuprate superconductors,it was found that the superfluid density decreases with the increase of hole doping.One natural question is whether there exists normal fluid in the superconducting state in... In high temperature cuprate superconductors,it was found that the superfluid density decreases with the increase of hole doping.One natural question is whether there exists normal fluid in the superconducting state in the overdoped region.In this paper,we have carried out high-resolution ultra-low temperature laser-based angle-resolved photoemission measurements on a heavily overdoped Bi2212 sample with a T_(c) of 48 K.We find that this heavily overdoped Bi2212 remains in the strong coupling regime with 2Δ_(0)/(k_(B)T_(c))=5.8.The single-particle scattering rate is very small along the nodal direction(~5 meV) and increases as the momentum moves from the nodal to the antinodal regions.A hard superconducting gap opening is observed near the antinodal region with the spectral weight at the Fermi level fully suppressed to zero.The normal fluid is found to be negligibly small in the superconducting state of this heavily overdoped Bi2212.These results provide key information to understand the high T_(c) mechanism in the cuprate superconductors. 展开更多
关键词 cuprate superconductor angle-resolved photoemission spectroscopy electronic structure
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Two Distinct Charge Orders in Infinite-Layer PrNiO_(2+δ) Revealed by Resonant X-Ray Diffraction
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作者 Xiaolin Ren Ronny Sutarto +9 位作者 Qiang Gao Qisi Wang Jiarui Li Yao Wang Tao Xiang Jiangping Hu J.Chang Riccardo Comin X.J.Zhou Zhihai Zhu 《Chinese Physics Letters》 SCIE EI CAS CSCD 2024年第11期154-169,共16页
Research of infinite-layer nickelates has unveiled a broken translation symmetry,which has sparked significant interest in its root,its relationship to superconductivity,and its comparison to charge order in cuprates.... Research of infinite-layer nickelates has unveiled a broken translation symmetry,which has sparked significant interest in its root,its relationship to superconductivity,and its comparison to charge order in cuprates.In this study,resonant x-ray scattering measurements were performed on thin films of infinite-layer PrNiO_(2+δ).The results show significant differences in the superlattice reflection at the Ni L_(3) absorption edge compared to that at the Pr M_(5) resonance in their dependence on energy,temperature,and local symmetry.These differences point to two distinct charge orders,although they share the same in-plane wavevectors.It is suggested that these dissimilarities could be linked to the excess oxygen dopants,given that the resonant reflections were observed in an incompletely reduced PrNiO_(2+δ)film.Furthermore,azimuthal analysis indicates that the oxygen ligands likely play a crucial role in the charge modulation revealed at the Ni L_(3) resonance. 展开更多
关键词 film. RESONANT CHARGE
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标准化助力第二代高温超导带材产业化 被引量:2
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作者 李洁 刘宜平 +5 位作者 史越 蔡传兵 赵跃 张国民 郑东宁 周兴江 《中国标准化》 2021年第S01期87-93,共7页
国内第二代高温超导带材产业化萌芽于2015年,发展势头强劲,目前已经能够满足绝大部分国内大型示范应用项目的材料需求。尽管与国际一流水平相比带材性能尚有差距,但已经开始凭借超强的性价比参与国际竞争。本文以第二代高温超导长带的... 国内第二代高温超导带材产业化萌芽于2015年,发展势头强劲,目前已经能够满足绝大部分国内大型示范应用项目的材料需求。尽管与国际一流水平相比带材性能尚有差距,但已经开始凭借超强的性价比参与国际竞争。本文以第二代高温超导长带的临界电流(Ic)及其均匀性测试方法(四引线法和感应法)标准化、力学性能测试方法(轴向拉伸应力—应变曲线和横向拉伸强度)标准化为例,介绍全国超导标准化技术委员会近年来在这一领域的标准制修订工作,及其对第二代高温超导带材新兴产业发展的助推作用。 展开更多
关键词 REBCO涂层导体 第二代高温超导带材 标准化 临界电流测量 力学性能测量
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IEC/TC90超导国际标准化工作介绍 被引量:1
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作者 李洁 杨乾声 +6 位作者 刘宜平 肖玲 史越 郑东宁 张国民 尤立星 周兴江 《中国标准化》 2019年第S01期254-260,共7页
本文介绍了超导技术领域的国际标准化组织——国际电工委员会超导技术委员会(IEC/TC90 Superconductivity)的基本情况、超导技术领域的国际标准体系、IEC/TC90目前在研的和预研的标准化项目以及近期的发展战略。同时回顾和总结了我国参... 本文介绍了超导技术领域的国际标准化组织——国际电工委员会超导技术委员会(IEC/TC90 Superconductivity)的基本情况、超导技术领域的国际标准体系、IEC/TC90目前在研的和预研的标准化项目以及近期的发展战略。同时回顾和总结了我国参与超导国际标准化工作的历程、所取得的成绩和存在的不足,对我国超导技术领域未来的标准化之路提出了一些思路和建议。 展开更多
关键词 超导 组织机构 标准化
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新型机械解理方法在二维材料研究中的应用 被引量:5
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作者 许宏 孟蕾 +9 位作者 李杨 杨天中 鲍丽宏 刘国东 赵林 刘天生 邢杰 高鸿钧 周兴江 黄元 《物理学报》 SCIE EI CAS CSCD 北大核心 2018年第21期41-51,共11页
自从石墨烯被发现以来,机械解理技术已经成为制备高质量二维材料的重要方法之一,在二维材料本征物性的研究方面展现出了独特的优势.然而传统机械解理方法存在明显的不足,如制备效率低、样品尺寸小等,阻碍了二维材料领域的研究进展.近些... 自从石墨烯被发现以来,机械解理技术已经成为制备高质量二维材料的重要方法之一,在二维材料本征物性的研究方面展现出了独特的优势.然而传统机械解理方法存在明显的不足,如制备效率低、样品尺寸小等,阻碍了二维材料领域的研究进展.近些年我们在机械解理技术方面取得了一系列的突破,独立发展了一套具有普适性的新型机械解理方法.这种新型机械解理方法的核心在于通过改变解理过程中的多个参数,增强层状材料与基底之间的范德瓦耳斯相互作用,从而提高单层样品的产率和面积.本文着重以石墨烯为例,介绍了该技术的过程和机理.相比于传统机械解理方法,石墨烯的尺寸从微米量级提高到毫米量级,面积提高了十万倍以上,产率大于95%,同时石墨烯依然保持着非常高的质量.这种新型机械解理方法具有良好的普适性,目前已经在包括MoS_2, WSe_2, MoTe_2, Bi2212等几十种材料体系中得到了毫米量级以上的高质量单层样品.更重要的是,在解理过程中,通过调控不同的参数,可以在层状材料中实现一些特殊结构的制备,如气泡、褶皱结构等,为研究这些特殊材料体系提供了重要的物质保障.未来机械解理技术还有很多值得深入研究的科学问题,该技术的突破将会极大地推动二维材料领域的研究进展. 展开更多
关键词 二维材料 机械解理 石墨烯 范德瓦耳斯相互作用
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高温超导体电子结构和超导机理的角分辨光电子能谱研究 被引量:7
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作者 赵林 刘国东 周兴江 《物理学报》 SCIE EI CAS CSCD 北大核心 2021年第1期29-53,共25页
超导是一种奇异的宏观量子现象.100多年来,已发现的超导体主要分为两类:以金属或者合金为代表的常规超导体以及以铜氧化物和铁基高温超导体为代表的非常规超导体.常规超导体的超导机理能被BCS超导理论完美解释,但高温超导体的超导机理... 超导是一种奇异的宏观量子现象.100多年来,已发现的超导体主要分为两类:以金属或者合金为代表的常规超导体以及以铜氧化物和铁基高温超导体为代表的非常规超导体.常规超导体的超导机理能被BCS超导理论完美解释,但高温超导体的超导机理至今仍未达成共识,已经成为凝聚态物理领域中长期争论且充满挑战的重大科学问题.从实验上揭示非常规超导材料的微观电子结构,是理解其奇异正常态和超导电性机理、建立新理论的前提和基础.角分辨光电子能谱技术,由于可以实现对材料中电子的能量、动量和自旋的直接测量,在高温超导研究中发挥了重要的作用.本文综述了我们利用角分辨光电子能谱技术在铜氧化物和铁基高温超导体电子结构和超导机理研究中取得的一些进展,主要包括母体的电子结构、正常态的非费米液体行为、超导态的能带和超导能隙结构以及多体相互作用等.这些结果为理解铜氧化物和铁基高温超导体的物性及超导机理提供了重要的信息. 展开更多
关键词 高温超导 角分辨光电子能谱 电子结构 超导机理
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铁基高温超导体电子结构的角分辨光电子能谱研究 被引量:4
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作者 赵林 刘国东 周兴江 《物理学报》 SCIE EI CAS CSCD 北大核心 2018年第20期222-247,共26页
铜氧化物超导体和铁基超导体是人类相继发现的两类高温超导家族,它们的高温超导机理是凝聚态物理领域中长期争论但悬而未决的重大问题.对铁基超导体广泛而深入的研究,以及与铜氧化物高温超导体的对比,对于发展新的量子固体理论、解决高... 铜氧化物超导体和铁基超导体是人类相继发现的两类高温超导家族,它们的高温超导机理是凝聚态物理领域中长期争论但悬而未决的重大问题.对铁基超导体广泛而深入的研究,以及与铜氧化物高温超导体的对比,对于发展新的量子固体理论、解决高温超导机理、探索新的超导体以及超导实际应用都具有重要意义.固体材料的宏观物性由其微观电子结构所决定,揭示高温超导材料的微观电子结构是理解高温超导电性的前提和基础.由于角分辨光电子能谱技术具有独特的同时对能量、动量甚至自旋的分辨能力,己成为探测材料微观电子结构的最直接、最有力的实验手段,在高温超导体的研究中发挥了重要作用.本文综述了在不同体系铁基超导体中费米面拓扑结构、超导能隙大小和对称性、轨道三维性和选择性、电子耦合模式等的揭示和发现,为甄别和提出铁基超导新理论、解决高温超导机理问题提供重要依据. 展开更多
关键词 高温超导 角分辨光电子能谱 电子结构 超导机理
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冷藏周转箱内虹鳟鱼片新鲜度的综合评价 被引量:2
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作者 成传香 刘晓东 +2 位作者 周兴江 李美琦 薛瑞婷 《天津农林科技》 2017年第2期7-10,共4页
本文应用近0℃冷藏周转箱来延长虹鳟鱼片的货架期。分析比较了虹鳟鱼片在冷藏条件下菌落总数、pH值、TVB-N值、TBARS值和感官值等变化。试验结果表明,随着贮藏时间延长,虹鳟鱼片的菌落总数、TVB-N值、TBARS值增大;pH值先下降后上升;感... 本文应用近0℃冷藏周转箱来延长虹鳟鱼片的货架期。分析比较了虹鳟鱼片在冷藏条件下菌落总数、pH值、TVB-N值、TBARS值和感官值等变化。试验结果表明,随着贮藏时间延长,虹鳟鱼片的菌落总数、TVB-N值、TBARS值增大;pH值先下降后上升;感观分值逐渐降低。综合评价表明,近0℃周转箱贮藏的虹鳟鱼片,贮藏6 d虹鳟鱼片属于1级鲜度;贮藏6~9 d的虹鳟鱼片属于2级鲜度;贮藏12 d为虹鳟鱼片的货架期终点。该研究为实现虹鳟鱼商超冷链销售提供试验依据。 展开更多
关键词 虹鳟鱼 冷藏周转箱 货架期
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Intrinsic electronic structure and nodeless superconducting gap of YBa_(2)Cu_(3)O_(7)-σ observed by spatially-resolved laser-based angle resolved photoemission spectroscopy
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作者 李帅帅 苗泰民 +17 位作者 殷超辉 李颖昊 闫宏涛 陈逸雯 梁波 陈浩 朱文培 张申金 王志敏 张丰丰 杨峰 彭钦军 林成天 毛寒青 刘国东 许祖彦 赵林 周兴江 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第11期263-268,共6页
The spatially-resolved laser-based high-resolution angle resolved photoemission spectroscopy(ARPES) measurements have been performed on the optimally-doped YBa_(2)Cu_(3)O_(7)-σ(Y123) superconductor. For the first tim... The spatially-resolved laser-based high-resolution angle resolved photoemission spectroscopy(ARPES) measurements have been performed on the optimally-doped YBa_(2)Cu_(3)O_(7)-σ(Y123) superconductor. For the first time, we found the region from the cleaved surface that reveals clear bulk electronic properties. The intrinsic Fermi surface and band structures of Y123 were observed. The Fermi surface-dependent and momentum-dependent superconducting gap was determined which is nodeless and consistent with the d+is gap form. 展开更多
关键词 YBCO angle resolved photoemission spectroscopy electronic structure superconducting gap
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二次烧成冷却条件对SrTiO_3基晶界层电容器晶界结构及性能的影响 被引量:2
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作者 金玉琢 李龙土 周兴江 《中国建筑材料科学研究院学报》 1990年第3期34-40,共7页
以化学计量配比的SrTiO_3为基,采用PbO-Bi_2O_3-B_2O_3-CuO系氧化物为绝缘涂层,研究了二次烧成冷却条件对晶界层电容器晶界结构及性能的影响。实验结果表明,淬火有利于制备高表观介电常数的晶界层电容器。对炉冷和淬火样品的SEM/EDAX分... 以化学计量配比的SrTiO_3为基,采用PbO-Bi_2O_3-B_2O_3-CuO系氧化物为绝缘涂层,研究了二次烧成冷却条件对晶界层电容器晶界结构及性能的影响。实验结果表明,淬火有利于制备高表观介电常数的晶界层电容器。对炉冷和淬火样品的SEM/EDAX分析表明,淬火样品晶界以扩散层为主,第二相主要集中在三角晶界处,同时淬火样品晶界第二相成份比炉冷样品的要均匀,没有发生相分离。淬火样品晶界较少及均匀第二相的存在,是造成淬火样品性能比炉冷样品要好的原因。炉冷样品晶界第二相发生了相分离,第二相中有富Cu相和富Ti相析出。 展开更多
关键词 晶界层电容器 SRTIO3 冷却 烧成
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一种光电子能谱费米面拼接方法
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作者 贾小文 周兴江 《物理与工程》 2019年第3期80-84,共5页
光电子能谱技术可以直接探测材料的费米面结构,是研究材料电子结构的重要实验手段。由于光源光子能量、探测器探测角度范围以及材料本身的因素,光电子能谱技术一次只能探测布里渊区一个位置区域的费米面信息。本文提出一种将不同位置区... 光电子能谱技术可以直接探测材料的费米面结构,是研究材料电子结构的重要实验手段。由于光源光子能量、探测器探测角度范围以及材料本身的因素,光电子能谱技术一次只能探测布里渊区一个位置区域的费米面信息。本文提出一种将不同位置区域测量的费米面拼接起来的方法:首先根据费米面结构特征对费米面进行配准,以其中一个费米面为基准,求出仿射变换矩阵,然后对费米面进行二值化,求出测量区域轮廓,最后以到测量区域轮廓的距离作为权重将两费米面重叠区域按照像素进行拼接融合,非重叠区域保持不变。与直接相加相比,这种方法可以有效融合重叠区域,消除边界处的不连续性,获取完整费米面,提高数据质量。本文提到的方法可以从数据处理的角度弥补角分辨光电子能谱在探测范围上的不足。 展开更多
关键词 费米面 角分辨光电子能谱 数据拼接
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Multiple Nodeless Superconducting Gaps in (Ba0.6K0.4)Fe2As2 Superconductor from Angle-Resolved Photoemission Spectroscopy 被引量:5
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作者 赵林 刘海云 +15 位作者 张文涛 孟建桥 贾小文 刘国东 董晓莉 陈根富 雒建林 王楠林 陆伟 王桂玲 周永 朱镛 王晓洋 许祖彦 陈创天 周兴江 《Chinese Physics Letters》 SCIE CAS CSCD 2008年第12期4402-4405,共4页
High resolution angle-resolved photoemission measurements have been carried out to study the superconducting gap in the (Ba0.6K0.4)Fe2As2 superconductor with Tc=35 K. Two hole-like Fermi surface sheets around the F ... High resolution angle-resolved photoemission measurements have been carried out to study the superconducting gap in the (Ba0.6K0.4)Fe2As2 superconductor with Tc=35 K. Two hole-like Fermi surface sheets around the F point exhibit different superconducting gaps. The inner Fermi surface sheet shows larger (10 - 12 meV) and slightly momentum-dependent gap while the outer one has smaller (7 - 8 meV) and nearly isotropic gap. The lack of gap node in both Fermi surface sheets favours s-wave superconducting gap symmetry. Superconducting gap opening is also observed at the M(π, π) point. The two Fermi surface spots near the M point are gapped below Tc but the gap persists above Tc. The rich and detailed superconducting gap information will provide key insights and constraints in understanding pairing mechanism in the iron-based superconductors. 展开更多
关键词 field emission molybdenum dioxide enhancement factor
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Sixth Harmonic of A Nd:YVO4 Laser Generation In KBBF for ARPES 被引量:3
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作者 周勇 王桂玲 +9 位作者 李成明 彭钦军 崔大复 许祖彦 王晓洋 朱镛 陈创天 刘国栋 董晓莉 周兴江 《Chinese Physics Letters》 SCIE CAS CSCD 2008年第3期963-965,共3页
We report that a deep ultraviolet (DUV) laser from the sixth harmonic of a 1064nm laser has been firstly used as light source in an ultrahigh energy-resolution angle-resolved photoemission spectroscopy (ARPES). Th... We report that a deep ultraviolet (DUV) laser from the sixth harmonic of a 1064nm laser has been firstly used as light source in an ultrahigh energy-resolution angle-resolved photoemission spectroscopy (ARPES). The wavelength is 177.3nm obtained by using the second harmonic KBe2BO3F2 crystal with a frequency tripled 1064nm Nd:YVO4 laser. The large flux (10^14 - 10^15 photons/s) and narrow line width (0.26 meV) are suitable for the ultrahigh-energy resolution ARPES. The laser-ARPES can be a powerful tool to study the electronic structure at and near the Fermi level of the superconductor and correlated materials. The laser-ARPES has worked more than 500 h already. 展开更多
关键词 KBE2BO3F2 CRYSTAL DEEP-ULTRAVIOLET SUPERCONDUCTORS PULSES LIGHT
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Preparation of Superconducting Thin Films of Infinite-Layer Nickelate Nd_(0.8)Sr_(0.2)NiO_(2) 被引量:3
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作者 Qiang Gao Yuchen Zhao +1 位作者 Xing-Jiang Zhou Zhihai Zhu 《Chinese Physics Letters》 SCIE CAS CSCD 2021年第7期136-139,共4页
The recent observation of superconductivity in thin films of infinite-layer nickelate Nd_(0.8)Sr_(0.2)NiO_(2) has received considerable attention.Despite the many efforts to understand the superconductivity in infinit... The recent observation of superconductivity in thin films of infinite-layer nickelate Nd_(0.8)Sr_(0.2)NiO_(2) has received considerable attention.Despite the many efforts to understand the superconductivity in infinite-layer nickelates,a consensus on the underlying mechanism for the superconductivity has yet to be reached,partly owing to the challenges with the material synthesis.Here,we report the successful growth of superconducting infinite-layer Nd_(0.8)Sr_(0.2)NiO_(2) films by pulsed laser deposition and soft chemical reduction.The details on the growth process are discussed. 展开更多
关键词 synthesis REDUCTION INFINITE
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Common Electronic Features and Electronic Nematicity in Parent Compounds of Iron-Based Superconductors and FeSe/SrTiO_3 Films Revealed by Angle-Resolved Photoemission Spectroscopy 被引量:1
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作者 刘德发 赵林 +22 位作者 何少龙 胡勇 沈兵 黄建伟 梁爱基 徐煜 刘旭 何俊峰 牟代翔 刘单于 刘海云 刘国东 张文号 李坊森 马旭村 薛其坤 陈仙辉 陈根富 俞理 张君 许祖彦 陈创天 周兴江 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第7期152-156,共5页
We report comprehensive angle-resolved photoemission investigations on the electronic structures and nematicity of the parent compounds of the iron-based superconductors including CeFeAsO, BaFe2As2, NaFeAs, FeSe and u... We report comprehensive angle-resolved photoemission investigations on the electronic structures and nematicity of the parent compounds of the iron-based superconductors including CeFeAsO, BaFe2As2, NaFeAs, FeSe and undoped FeSe/SrTiO3 films with 1, 2 and 20 layers. While the electronic structure near tile Brillouin zone center F varies dramatically among different materials, the electronic structure near the Brillouin zone corners (M points), as well as their temperature dependence, are rather similar. The electronic structure near the zone corners is dominated by the electronic nematicity that gives rise to a band splitting of the dxz and dyz bands below the nematie transition temperature. A clear relation is observed between the band splitting magnitude arid the onset temperature of nematicity. Our results may shed light on the origin of nematicity, its effect on the electronic structures, and its relation with superconductivity in the iron-based superconductors. 展开更多
关键词 of on as or by Common Electronic Features and Electronic Nematicity in Parent Compounds of Iron-Based Superconductors and FeSe/SrTiO3 Films Revealed by Angle-Resolved Photoemission Spectroscopy in ARPES As that
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Electronic structure of transition metal dichalcogenides PdTe_2 and Cu_(0.05)PdTe_2 superconductors obtained by angle-resolved photoemission spectroscopy 被引量:1
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作者 刘艳 赵建洲 +21 位作者 俞理 林成天 胡成 刘德发 彭莹莹 谢卓晋 何俊峰 陈朝宇 冯娅 伊合绵 刘旭 赵林 何少龙 刘国东 董晓莉 张君 陈创天 许祖彦 翁虹明 戴希 方忠 周兴江 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第6期100-108,共9页
The layered transition metal chalcogenides have been a fertile land in solid state physics for many decades. Various MX2-type transition metal dichalcogenides, such as WTe2, IrTe2, and MoS2, have triggered great atten... The layered transition metal chalcogenides have been a fertile land in solid state physics for many decades. Various MX2-type transition metal dichalcogenides, such as WTe2, IrTe2, and MoS2, have triggered great attention recently, either for the discovery of novel phenomena or some extreme or exotic physical properties, or for their potential applications. PdTe2 is a superconductor in the class of transition metal dichalcogenides, and superconductivity is enhanced in its Cu- intercalated form, Cuo.05PdTe2. It is important to study the electronic structures of PdTe2 and its intercalated form in order to explore for new phenomena and physical properties and understand the related superconductivity enhancement mecha- nism. Here we report systematic high resolution angle-resolved photoemission (ARPES) studies on PdTe2 and Cuo.05PdTe2 single crystals, combined with the band structure calculations. We present in detail for the first time the complex multi-band Fermi surface topology and densely-arranged band structure of these compounds. By carefully examining the electronic structures of the two systems, we find that Cu-intercalation in PdTe2 results in electron-doping, which causes the band structure to shift downwards by nearly 16 meV in Cuo.05PdTe2. Our results lay a foundation for further exploration and investigation on PdTe2 and related superconductors. 展开更多
关键词 transition metal dichalcogenides PdTe2 SUPERCONDUCTOR PHOTOEMISSION
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导弹发射车总装工序评价研究与应用 被引量:1
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作者 姜薛起 张志华 +3 位作者 周兴江 汤卫丰 杨音年 王辉均 《现代制造工程》 CSCD 北大核心 2019年第11期23-27,61,共6页
航天导弹发射车产品总装与调试生产属于典型的多品种、小批量生产模式,传统的手工纸质记录、事后统计模式难以适应航天产品量化控制与风险控制的要求与发展趋势。通过在制造执行系统(Manufacturing Execution System,MES)中建立信息化... 航天导弹发射车产品总装与调试生产属于典型的多品种、小批量生产模式,传统的手工纸质记录、事后统计模式难以适应航天产品量化控制与风险控制的要求与发展趋势。通过在制造执行系统(Manufacturing Execution System,MES)中建立信息化质量信息分析模块的方式,实现了导弹发射车总装与调试工序相关测试数据的包络分析和批次比对分析;对1000余项测试项目基于能力过程控制指数进行总装与调试工序健康度评价,并对装调异常工序进行预警,实现了装调数据结果的高效识别与判定;实现了小批量的导弹发射车产品生产过程的细化控制、量化控制,对航天小批量产品的总装与调试生产过程实现高效、便捷的精细化质量管控具有一定适用性。 展开更多
关键词 导弹发射车 统计过程控制 工序能力指数
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Identification of Topological Surface State in PdTe2 Superconductor by Angle-Resolved Photoemission Spectroscopy 被引量:1
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作者 刘艳 赵建洲 +16 位作者 俞理 林成天 梁爱基 胡成 丁颖 徐煜 何少龙 赵林 刘国东 董晓莉 张君 陈创天 许祖彦 翁红明 戴希 方忠 周兴江 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第6期136-140,共5页
High-resolution angle-resolved photoemission measurements are carried out on transition metal dichalcogenide PdTe2 that is a superconductor with a Tc at 1.7K. Combined with theoretical calculations, we discover for th... High-resolution angle-resolved photoemission measurements are carried out on transition metal dichalcogenide PdTe2 that is a superconductor with a Tc at 1.7K. Combined with theoretical calculations, we discover for the first time the existence of topologically nontrivial surface state with Dirac cone in PbTe2 superconductor. It is located at the Brillouin zone center and possesses helical spin texture. Distinct from the usual three-dimensional topological insulators where the Dirac cone of the surface state lies at the Fermi level, the Dirac point of the surface state in PdTe2 lies deeply below the Fermi level at - 1.75 eV binding energy and is well separated from the bulk states. The identification of topological surface state in PdTe2 superconductor deeply below the Fermi level provides a unique system to explore new phenomena and properties and opens a door for finding new topological materials in transition metal ehalcogenides. 展开更多
关键词 Identification of Topological Surface State in PdTe2 Superconductor by Angle-Resolved Photoemission Spectroscopy ARPES
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