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Nodeless superconductivity in the kagome metal CsV_(3)Sb_(5)

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Science China(Physics,Mechanics & Astronomy) 2021年第10期64卷 15-20页

作者： Weiyin Duan Zhiyong Nie shuaishuai luo Fanghang Yu Brenden R.Ortiz Lichang Yin Hang Su Feng Du An Wang Ye Chen Xin Lu Jianjun Ying Stephen DWilson Xianhui Chen Yu Song Huiqiu Yuan Center for Correlated Matter and Department of Physics Zhejiang UniversityHangzhou 310058China Zhejiang Province Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang UniversityHangzhou 310058China Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics and CAS Key Laboratory of Strongly-coupled Quantum Matter PhysicsUniversity of Science and Technology of ChinaHefei 230026China Materials Department and California Nanosystems Institute University of California Santa BarbaraSanta Barbara CA 93106USA CAS Center for Excellence in Quantum Information and Quantum Physics Hefei 230026China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China State Key Laboratory of Silicon Materials Zhejiang UniversityHangzhou 310058China

The recently discovered kagome metal series AV3Sb5(A=K, Rb, Cs) exhibits topologically nontrivial band structures, chiral charge order and superconductivity, presenting a unique platform for realizing exotic electronic states. The nature of the superconducting state and the corresponding pairing symmetry are key questions that demand experimental clarification. Here, using a technique based on the tunneling diode oscillator, the magnetic penetration depth ?λ(T) of CsV3Sb5 was measured down to 0.07 K. A clear exponential behavior in ?λ(T) with marked deviations from a T or T2 temperature dependence was observed at low temperatures, indicating an absence of nodal quasiparticles. Temperature dependence of the superfiuid density and electronic specific heat can be described by two-gap s-wave superconductivity, consistent with the presence of multiple Fermi surfaces in CsV3Sb5. These results evidence nodeless superconductivity in CsV3Sb5 under ambient pressure, and constrain the allowed pairing symmetry.

关键词： kagome superconductor order parameter penetration depth

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不同晶型CaCO_(3)表面改性及CaCO_(3)/PDMS超疏水涂层的制备

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精细化工 2023年第8期40卷 1727-1733,1741页

作者：罗帅帅古卫乐操未青刘雷鹏胡攀田键湖北大学材料科学与工程学院功能材料绿色制备与应用教育部重点实验室工业废弃物绿色产业化应用技术湖北省工程研究中心湖北武汉430062 陕西科技大学轻工科学与工程学院陕西西安710021 玉林师范学院碳酸钙产业发展研究院广西玉林537000 湖北湖大天沭新能源材料工业研究设计院有限公司湖北武汉430062

利用硬脂酸钠(NaSt)和油酸钠(NaOL)对文石型和方解石型两种CaCO_(3)粉体进行表面改性,将改性的CaCO_(3)粉体与聚二甲基硅氧烷(PDMS)共混,喷涂得到了CaCO_(3)/PDMS基超疏水涂层。采用XRD、SEM、接触角测量仪对改性CaCO_(3)粉体及超疏水... 详细信息

利用硬脂酸钠(NaSt)和油酸钠(NaOL)对文石型和方解石型两种CaCO_(3)粉体进行表面改性,将改性的CaCO_(3)粉体与聚二甲基硅氧烷(PDMS)共混,喷涂得到了CaCO_(3)/PDMS基超疏水涂层。采用XRD、SEM、接触角测量仪对改性CaCO_(3)粉体及超疏水涂层进行测试,考察了不同晶型CaCO_(3)用量对涂层疏水性能的影响,并对超疏水涂层的自清洁性及稳定性进行了评价。结果表明,当NaSt和NaOL用量分别为反应体系CaCO_(3)理论生成质量的5%时,CaCO_(3)粉体改性效果最好,所制备的CaCO_(3)/PDMS涂层疏水性最佳。当CaCO_(3)和PDMS质量比为1.5∶1时,CaCO_(3)/PDMS涂层接触角>150°,具有超疏水性。玻璃板涂层表面的亚甲基蓝污染物可以完全随着液滴被冲走,没有残留,且经过500 m L流速5 m/s的水流冲击,接触角仍达140°以上。

关键词：超疏水涂层碳酸钙喷涂法自清洁稳定性功能材料

钒基笼目AV_(3)Sb_(5)(A=K,Rb,Cs)体系的超导序参量及高压研究

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中国科学：物理学、力学、天文学 2023年第12期53卷 159-178页

作者：张栋庭罗帅帅段玮茵宋宇路欣袁辉球浙江大学关联物质研究中心和物理学院杭州310058

笼目晶格具有本征的几何阻挫,长期以来是研究量子磁性的重要平台.近年来,笼目晶格金属中的狄拉克费米子、平带、范霍夫奇点等能带结构及其调控受到了广泛关注.其中,钒基笼目AV_(3)Sb_(5)(A=K,Rb,Cs)体系具有非常规电荷密度波(CDW)及与... 详细信息

笼目晶格具有本征的几何阻挫,长期以来是研究量子磁性的重要平台.近年来,笼目晶格金属中的狄拉克费米子、平带、范霍夫奇点等能带结构及其调控受到了广泛关注.其中,钒基笼目AV_(3)Sb_(5)(A=K,Rb,Cs)体系具有非常规电荷密度波(CDW)及与其共存的超导,近期涌现了大量针对其物理性质和机制的研究工作.基于浙江大学关联物质研究中心在AV_(3)Sb_(5)体系中开展的一系列工作,本文对AV_(3)Sb_(5)中超导序参量对称性、超导与CDW的关系、超导的高压调控等方面的研究进行介绍.这些研究表明,无论CDW是否与超导共存,CsV_(3)Sb_(5)都保持无能隙节点的超导序参量,且超导能隙大小对压力或应力调控高度敏感.在静水压调控下,AV_(3)Sb_(5)中的CDW随着压力的增加被逐渐抑制,与超导的相互作用表现为竞争,没有CDW量子临界点的特征.在AV_(3)Sb_(5)中的CDW被压力抑制后,更高的压力下超导转变温度出现由结构相变驱动的非单调演化,形成高压下的超导圆顶.基于已有的研究,我们讨论AV_(3)Sb_(5)体系的共性以及待解决的科学问题.

关键词：笼目超导体超导序参量电荷密度波结构相变压力调控

红树植物根际土壤细菌分离鉴定及抑菌活性的研究

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黑龙江畜牧兽医 2023年第3期 73-78页

作者：戴悦张汝军张腾月彭金菊谢星朋罗帅帅马驿广东海洋大学滨海农业学院动物医学系广东湛江524088 岭南现代农业科学与技术广东省实验室茂名分中心广东茂名525000 张家界市慈利县高峰土家族乡人民政府湖南慈利427299

为了从红树林植物根际土壤中分离出具有广谱抑菌作用的海洋细菌,试验以大肠杆菌、金黄色葡萄球菌、沙门氏菌、链球菌4种常见致病菌为指示菌,采用M10和P3培养基从红树植物根际土壤中分离细菌,以固体琼脂打孔法对分离的细菌进行抑菌活性筛... 详细信息

为了从红树林植物根际土壤中分离出具有广谱抑菌作用的海洋细菌,试验以大肠杆菌、金黄色葡萄球菌、沙门氏菌、链球菌4种常见致病菌为指示菌,采用M10和P3培养基从红树植物根际土壤中分离细菌,以固体琼脂打孔法对分离的细菌进行抑菌活性筛选,并提取分离菌株的基因组DNA,PCR扩增16S rDNA基因并测序,同时采用邻接法构建系统发育树。结果表明:从红树植物土壤中分离得到654株细菌,其中107株细菌具有抑菌活性,占分离菌株的16.4%。菌株M36对大肠杆菌和链球菌抑菌活性最强,抑菌圈直径分别为13 mm、16 mm;菌株P19和P25对金黄色葡萄球的抑菌活性最强,抑菌圈直径均为16 mm;菌株P83对沙门氏菌抑菌活性最强,抑菌圈直径为13 mm;菌株M36和P31的抑菌谱最广。综合两种培养基的培养结果有抑菌活性的菌株被分成4个属,分别是肠杆菌属、芽孢杆菌属、葡萄球菌属、伯克霍尔德氏菌属,其中肠杆菌属为优势菌属,其次为芽孢杆菌属,占比分别为69.2%和15.9%。说明红树植物根际土壤中存在具有广谱抑菌活性的细菌。

关键词：红树林根际细菌分离鉴定抑菌活性海洋细菌

La_(4)TX(T=Ru,Rh,Ir;X=Al,In):一个具有可调节反对称自旋轨道耦合强度的新型非中心对称超导体系

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Science China Materials 2023年第3期66卷 1114-1123页

作者：苏杭杜锋罗帅帅聂智勇李蕊谢武沈斌王云枫王安 Toshiro Takabatake 曹超 Michael Smidman 袁辉球 Center for Correlated Matter and School of Physics Zhejiang UniversityHangzhou 310058China Zhejiang Province Key Laboratory of Quantum Technology and Device School of PhysicsZhejiang UniversityHangzhou 310058China Department of Quantum Matter Graduate School of Advanced Science and EngineeringHiroshima UniversityHigashi-Hiroshima 739-8530Japan Condensed Matter Group Department of PhysicsHangzhou Normal UniversityHangzhou 311121China State Key Laboratory of Silicon Materials Zhejiang UniversityHangzhou 310058China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

本文报道了非中心对称化合物家族La_(4)TX(T=Ru,Rh,Ir;X=Al In)中的超导电性.该系列超导体具有立方晶体结构,空间群为F 43m La_(4)RuAl,La_(4)RhAl,La_(4)IrAl,La_(4)RuIn和La_(4)IrIn的超导转变温度在0.61–3.35 K之间,而La_(4)RuIn尚未被成功制备.La_(4)RuAl和La_(4)RhAl的低温比热可由无超导能隙节点的s波超导描述,而自旋-轨道耦合强度较大的La_(4)IrAl则可能存在能隙节点.这些超导体的上临界磁场都可由Werthamer-Helfand-Hohenberg模型描述,且上临界场Hc2(0)远低于泡利极限,说明轨道效应在库伯对拆对机制中占据主导.密度泛函理论计算表明,对于该超导家族的不同化合物,其反对称自旋-轨道耦合导致的能带劈裂存在明显区别,有助于进一步探究超导配对态与反对称自旋-轨道耦合强度之间的联系.

关键词：自旋轨道耦合超导转变温度密度泛函理论计算超导能隙非中心对称超导电性立方晶体上临界磁场

Unveiling the superior hydrogen evolution reaction activity of 1T-2H MoS_(2)heterointerface by on-chip microdevices

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Nano Research 2025年第1期18卷 149-156页

作者： Bowen Liu Junjie Xiong shuaishuai Xu Xinying luo Wenyan Yao Shigang Liu Yuting Du Qinghua Zhang Yang Gao Bin Wang CAS Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and Technology(NCNST)Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Materials Science and Engineering China University of Petroleum(East China)Qingdao 266580China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

The identification and clarification of active sites of MoS_(2)have long been the focus of research efforts in hydrogen evolution reaction(HER).In this study,we constructed phase transition-induced 1T-2H MoS_(2)heterojunction via lithium intercalation and evaluated the HER activity using on-chip electrocatalytic microdevices(OCEMs).The heterojunction achieved an overpotential of only 226 mV at a cathodic current density of 10 mA/cm^(2),outperforming the basal planes of 1T and 2H MoS_(2).Furthermore,density functional theory(DFT)calculations demonstrated that the charge redistribution occurs at the 1T-2H MoS_(2)interface with electrons transferring from 1T to 2H MoS_(2),and the interfacial S atom at the top site of 1T MoS_(2)presents the smallest overpotential of 0.37 ***,the interference from highly active edge sites was avoided by precisely exposing specific active areas,quantitatively revealing the catalytic activity order of different types of in-plane MoS_(2)active *** work enables a systematic investigation of the HER activity of various active sites in MoS_(2),laying the foundation for quantitative analysis of activity in other lowdimensional materials.

关键词： on-chip microdevice phase transition heterojunction MoS_(2) hydrogen evolution reaction(HER)

海水中细菌的分离鉴定及其对动物源病原菌的抑菌活性研究

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中兽医医药杂志 2024年第1期43卷 8-12,F0002页

作者：马浩天李杨余梦博谢星朋罗帅帅彭金菊马驿广东海洋大学滨海农业学院广东湛江524000 岭南现代农业科学与技术广东省试验室茂名分中心广东茂名525000

为了分离出具有抑菌活性的海洋细菌,利用M10培养基、P3培养基和BHI固体培养基从海水样品中分离细菌,采用固体琼脂打孔法从分离细菌中筛选对大肠杆菌、铜绿假单胞菌、金黄色葡萄球菌和单增李斯特氏菌有抑菌活性的细菌,PCR扩增具有抑菌活... 详细信息

为了分离出具有抑菌活性的海洋细菌,利用M10培养基、P3培养基和BHI固体培养基从海水样品中分离细菌,采用固体琼脂打孔法从分离细菌中筛选对大肠杆菌、铜绿假单胞菌、金黄色葡萄球菌和单增李斯特氏菌有抑菌活性的细菌,PCR扩增具有抑菌活性的细菌的16S rDNA基因并进行测序分析。结果表明,从湛江地区海水中共分离出1615株细菌,其中246株具有抑菌活性,对4种指示菌均有抑菌效果的细菌有6株。对大肠杆菌抑菌效果最佳的菌株DB17-1抑菌圈直径为26 mm,对金黄色葡萄球菌抑菌效果最佳的菌株FP5-2抑菌圈直径为29 mm,对铜绿假单胞菌抑菌效果最佳的菌株AM20-8抑菌圈直径为20 mm,对单增李斯特氏菌抑菌效果最佳的菌株FM11-1抑菌圈直径为24 mm。具有抑菌活性的细菌共分为31个属,其中不动杆菌属和芽孢杆菌属最多,分别占21.5%和18.3%。结果提示,海水中存在具有良好抑菌效果的细菌,可为发掘新型抗菌药物提供参考。

关键词：海水分离鉴定抑菌活性动物源病原菌

Configuring topologically optimum vapor recompressed dividing-wall distillation columns to maximize operating efficiency

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Chinese Journal of Chemical Engineering 2023年第5期57卷 247-264页

作者： Kejin Huang shuaishuai Han Lijing Zang Haisheng Chen Yihang luo Liang Zhang Yang Yuan Xing Qian Shaofeng Wang College of Information Science and Technology Beijing University of Chemical TechnologyBeijing 100029China

For dividing-wall distillation columns(DWDCs) separating a heavy-component dominated and wide boiling-point ternary(HCDWBT) mixture, a significant amount of excessive heat exists inevitably in stripping the heavy-component from the intermediate-component and it can be employed to initiate the development of vapor recompression heat pump(VRHP) assisted DWDC(VRHP-DWDC). Despite dividing wall may locate in the top, middle, and bottom, the optimum VRHP-DWDC is found to involve uniformlytwo VRHP circles. While the first one serves to compress and transform the excessive heat resulted from the separation of the heavy-component from the intermediate-component, the second one to compress and transform the overhead vapor stream of the light-component pre-heated sequentially with the condensate from the first one and the bottom product stream of the heavy-component, both releasing the temperature-elevated latent heat to the pre-fractionator's or common stripping section. The processing of two HCDWBT mixtures of benzene/toluene/o-xylene and n-pentane/n-hexane/n-heptane are selected to assess the derived optimum topological configurations of the VRHP-DWDC and their optimality is confirmed through detailed comparisons with the DWDC and two VRHP-DWDCs involving only one VRHP circle. The proposed strategy helps to tap the full potential of the VRHP-DWDC with considerably alleviated complication in process development.

关键词： dividing-wall distillation columns Heavy-component dominance Vapor recompression heat pump Process development Economic behavior

Zircon U-Pb Ages of the Muchang Alkali Granites in Zhenkang Block, Western Yunnan: Implication for the Time Limit on Tectono-Magmatic Activities

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Acta Geologica Sinica(English Edition) 2019年第4期93卷 1152-1153页

作者： YANG Fucheng LI Wenchang LIU Xuelong WANG shuaishuai YANG Yunkai GU Youwei luo Ying Faculty of Land and Resource Engineering Kunming University of Science and TechnologyKunming 650093China Chengdu Geological Survey Center of China Geological Survey Chengdu 610081China Mingguang Mining Co. Ltd.Baoshan 679100China Yunnan Gold Mining Group Co. LtdKunming 650200China

Objective The Luziyuan super-large Pb-Zn-Fe polymetallic ore district is located in the southern section of the Baoshan-Zhenkang block,which is an important part of the Pb-Zn-Cu-Fe-Sn-Au polymetallic metallogenic belt... 详细信息

关键词： Pb Zn Block