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Science china(Physics,Mechanics & Astronomy) 2007年第2期50卷 240-248页

作者： WANG WeiXian1,ZHOU Fang2.TAN Shun1,WU Huan1 & ZHANG YuHeng1 1 National High Magnetic Field Laboratory,University of Science and Technology of china,Hefei 2.002.,china 2.National Laboratory for Superconductivity,lnstitute of Physics and the {2. for condensed matter Physics,Chinese academy of sciences,beijing 100080,china National High Magnetic Field Laboratory University of Science and Technology of China Hefei China National Laboratory for Superconductivity Institute of Physics and the Center for Condensed Matter Physics Chinese Academy of Sciences Beijing China

In the strict sense, it is not very clear why with magnetic field increasing, the normal-superconductive (NS) transition becomes broad for Bi2.r2.aCu2.8+δ(Bi2.12. while the NS transitions are almost parallel for La193.roo7Cu04+δ(La2.4). In this paper, R-T relations are measured by the six-probe method. We propose a moving mechanism of the pancake vortex and vortex line for Bi2.12. The theoretical curves fit the experiment data well.

关键词： superconductivity superconductive pancake vortex dynamics

Suppressing the multimodal size distribution of InAs/GaAs quantum dots through flattening the surface fluctuation

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Science china(Physics,Mechanics & Astronomy) 2010年第5期53卷 788-792页

作者： WANG Lu1,2.LI MeiCheng1,WANG WenXin2.GAO HanChao2.TIAN HaiTao2.XIONG Min1 & ZHAO LianCheng1 1 School of Material Science and Technology,Harbin institute of Technology,Harbin 150001,china 2.National Laboratory for {2. matter Physics,institute of Physics,Chinese academy of sciences,beijing 100190,china School of Material Science and Technology Harbin Institute of Technology Harbin China National Laboratory for condensed matter Physics Institute of Physics Chinese Academy of Sciences Beijing China

A method of suppressing the multimodal size distribution of InAs/GaAs quantum dots(QDs) using molecular beam epitaxy through flattening the substrate surface is reported in this *** is found that the surface roughness plays an important role in the growth of QDs through continuous surface evolution(SEQDs).SEQDs are the main components of small QD ensemble in QDs with multimodal size *** is suggested that most of the SEQDs are very likely to nucleate during the growth interruption rather than during the *** growth of QDs on a smoother surface has largely reduced the density of *** photoluminescence line width of uniform QDs is found to be only 17 meV at a low temperature.

关键词： quantum dots multimodal surface fluctuation

Fabrication of atomically smooth SrRuO_3.thin films by laser molecular beam epitaxy

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Science china(Physics,Mechanics & Astronomy) 2008年第7期51卷 745-749页

作者： LIU GuoZhen1, HE Meng1, JIN KuiJuan1, YANG GuoZhen1, Lü HuiBin1, ZHAO Kun2. ZHENG ShiJian3.& MA XiuLiang3.1 beijing National Laboratory for condensed {2. Physics, institute of Physics, Chinese academy of sciences, beijing 100080, china 2.Department of Mathematics and Physics, china University of Petroleum, beijing 102.49, china 3.Shenyang National Laboratory for Materials Science, institute of Metal Research, Chinese academy of sciences, Shenyang 110016, china beijing National Laboratory for condensed {2. Physics Institute of Physics Chinese Academy of Sciences Beijing China Department of Mathematics and Physics China University of Petroleum Beijing China Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang China

High-quality SrRuO3.(SRO) thin films and SrTiO3.SRO bilayer were grown epitaxially on SrTiO3.(STO)(001) substrates by laser molecular beam epitaxy. The results of in situ observation of reflection high-energy electron diffraction and ex situ X-ray diffraction θ -2. scan indicate that the SRO thin films have good crystallinity. The measurements of atomic force microscopy and scan tunneling microscopy reveal that the surface of the SRO thin film is atomically smooth. The resistivity of the SRO thin film is 3.0 μΩ·cm at room temperature. Furthermore, the transmission electron microscopy study shows that the interfaces of STO/SRO and SRO/STO are very clear and no interfacial reaction layer was observed. The experimental results show that the SRO thin film is an excellent electrode material for devices based on perovskite oxide materials.

关键词： SrRuO3 thin film laser molecular beam epitaxy surface morphology

Containerless solidification of Zr_(41)Ti_(14)Cu_(12.5)Ni_(10)Be_(2..5) glass-forming alloy in drop tube

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Chinese Science Bulletin 2002年第20期47卷 1700-1703页

作者： LI Gong, SUN Liling & WANG WenkuiCollege of Material sciences and Engineering, Yanshan University, Qinhuangdao 066004, china {2. for {3. matter Physics, institute of Physics, Chinese academy of sciences, beijing 100080, china National Microgravit Coll. of Mat. Sci. and Engineering Yanshan University Qinhuangdao 066004 China center for condensed {2. Physics Institute of Physics Chinese Academy of Sciences Beijing 100080 China National Microgravity Laboratory Chinese Academy of Sciences Beijing 100080 China

Droplets of Zr41Ti14Cu12.5Ni10Be2..5 glass forming alloys with different sizes are solidified in a drop tube containerless processing. Glass transition behavior, crystallization kinetics, and the phase evolution during annealing of the Zr41Ti14Cu12.5Ni10Be2..5 glassy spheres are investigated. The experimental results indicate that the apparent activation energy of the glass transition (Eg=43..5 kJ/mol), and the activation energy of the main crystallization reaction (Ep1 = 2.9.6 kJ/mol) are obviously different from those of bulk glass samples prepared by water quenched (Eg=559.1 kJ/mol and Ep1=192.5 kJ/mol). The difference is discussed in the view point of the atomic configuration of the liquid state of the metallic glass and nucleation mechanism.

关键词： ZrTiCuNiBe alloy containerless processing activation energy drop tube.

Effect of ambient oxygen pressure on structural, optical and electrical properties of SnO_2.thin films

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Rare Metals 2006年第6期25卷 693-696页

作者： ZHAO Songqing ZHOU Yueliang WANG Shufang ZHAO Kun HAN Peng beijing National Laboratory for condensed {2. Physics Institute of Physics Chinese Academy of Sciences Beijing 100080 China Department of Mathematics and Physics China University of Petroleum Beijing 102249 China

PolycrystaUine SnO2.thin films were deposited on sapphire substrates at 450℃ under different ambient oxygen pressures by pulsed laser deposition technique. The effect of ambient oxygen pressure on the structural, optical and electrical properties of SnO2.thin films was studied. X-my diffraction and Hall measurements show that increasing the ambient oxygen pressure can improve crystallization of the films and decrease resistivity of the films. A violet emission peak centered at 409 nm was observed from photoluminescence measurements for SnO2.films under deposition ambient oxygen pressure above 5 Pa, which is related to the improvement of crystalline of the films.

关键词： tin oxide pulsed laser deposition oxygen pressure PLD resistivity

Anomalous Hall effect in perpendicular CoFeB thin films

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Chinese Physics B 2014年第4期23卷 9-17页

作者：朱涛 institute of Physics and beijing National Laboratory for {2. {3. Physics Chinese Academy of Sciences

Our recent research achievements in the perpendicular magnetic anisotropy （PMA） properties of the CoFeB sand- wiched by MgO and tantalum layers are summarized. We found that the PMA behaviors of Ta/CoFeB/MgO and MgO/CoFeB/Ta thin films are different. The larger PMA in the latter film is related to the lower magnetization of CoFeB deposited on MgO. Furthermore, we have demonstrated a large anomalous Hall effect in perpendicular CoFeB thin fihn. Our results show large anomalous Hall resistivity, large longitudinal resistivity, and low switching field can be achieved, all at the same time, in the perpendicular CoFeB thin film. Anomalous Hall effect with high and linear sensitivity is also found in an MgO/CoFeBFFa thin film with a thick MgO layer, which opens a door tbr future device applications of perpendicular ferromagnetic thin films.

关键词： anomalous Hall effect perpendicular magnetic anisotropy magnetic properties of interfaces

Studies of Structure Evolution of Nanostructured Hf_(11)Ni_(89) Alloy

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Journal of Materials Science & Technology 1998年第3期14卷 205-210页

作者： Zhenfu DONG and Lianmao PENG(beijing Lab. of Electron Microscopy, institute of Physics and {2. for {3. matter Physics,Chinese academy of sciences, P.O.Box 2.2., beijing 100080, china)Ke LU and Zhuangqi HU(State Key Lab. for RSA, institute of Meta beijing Lab. of Electron Microscopy Institute of Physics and Center for Condensed Matter Physics Chinese Academy of Sciences P.O.Box 2724 Beijing 100080 China State Key Lab. for RSA Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

A nanostructured Hf11Ni89 ribbon sample was prepared by melt-spinning. It was found that the as-quenched sample is composed of a major HfNi5 compound nanophase and an interfacial magnetic Ni(Hf) solid solution phase. The structure evolution of the sample was studied by using X-ray difFraction (XRD), transmission electron microscopy (TEM), difFerential scanning calorimetry (DSC), resistivity and magnetothermal analysis. Upon heating, a second precipitation process of the Ni(Hf) phase prior to grain growth wa5 detected by means of both structural analysis and physical property measurements. The measurement results are discussed based on the relationship between microstructure and physical properties.

关键词： Studies of Structure Evolution of Nanostructured Hf Alloy Ni

Spin-glass like behaviors in La_(1-x)Tb_xMnO_3.perovskite

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Science china(Physics,Mechanics & Astronomy) 2009年第12期52卷 1893-1897页

作者： ZHANG YingTang1,2.3.WANG ChunChang2.4,LIU WeiBin1,WANG Zhong3.LU HuiBin2.& CHEN ZiYu1 1 Department of Physics,{3. University of Aeronautics and Astronautics,{3. 100191 2.{2. of Physics & center for condensed matter Physics,Chinese academy of sciences,{3. 100190 3.School of Material Science & Engineering,Shaanxi University of Technology,Hanzhong 72.003.4 {2. of Superconducting and Electronic Materials,Wollongong University,Northfield Ave,Gwynneville,NSW 2.2.,Australia Department of Physics Beijing University of Aeronautics and Astronautics Beijing China institute of Physics & center for {2. {3. Physics Chinese Academy of Sciences Beijing China School of Material Science & Engineering Shaanxi University of Technology Hanzhong China institute of Superconducting and Electronic Materials Wollongong University Gwynneville Australia

A series of samples of La1-xTbxMnO3.(0≤x≤0.15) are prepared. The static and dynamic magnetizations of La1-xTbxMnO3.have been investigated. The results indicate that the spins with the short-range order are frozen into random direction at low enough temperatures which leads to the samples exhibiting the spin-glass like behavior. It is considered that the spin-glass like behavior originates from the competition between ferromagnetic double exchange among Mn3. and Mn2. and antiferromagnetic superex-change among Mn3. and Mn3.,as well as Tb3. and Tb3..

关键词： La1-xTbxMnO3 spin-glass-like behavior short-range order

Detection of protein microarrays by oblique-incidence reflectivity difference technique

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Science china(Physics,Mechanics & Astronomy) 2010年第2期53卷 306-309页

作者： WEN Juan1,LU Heng1,WANG Xu1,YUAN Kun1,L HuiBin1,ZHOU YueLiang1,JIN KuiJuan1,YANG GuoZhen1,LI Wei2.& RUAN KangCheng2.1 beijing National Laboratory for {3. {2. Physics,institute of Physics,Chinese academy of sciences,beijing 100190,china 2.Key Laboratory of Proteomics,institute of Biochemistry and Cell Biology,Shanghai institute for Biological sciences,Chinese academy of sciences,Shanghai 2.003.,china beijing National Laboratory for condensed {2. Physics Institute of Physics Chinese Academy of Sciences Beijing China Key Laboratory of Proteomics Institute of Biochemistry and Cell Biology Shanghai Institute for Biological Sciences Chinese Academy of Sciences Shanghai China

Biological microarrays with different proteins and different protein concentrations are detected without external labeling by an oblique-incidence reflectivity difference (OIRD) technique. The initial experiment results reveal that the intensities of OIRD signals can distinguish the different proteins and concentrations of protein. The OIRD technique promises feasible applications to life sciences for label-free and high-throughput detection.

关键词： oblique-incidence reflectivity difference protein microarray label-free detection

A 3.9 V polyanion-type cathode material for Li-ion batteries

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Progress in Natural Science:Materials International 2011年第3期21卷 211-215页

作者： Lei LIU,Bin ZHANG,Xue-jie HUANG beijing National Laboratory for condensed {2. Physics, {3. of Physics,Chinese academy of sciences,beijing,100190,china beijing National Laboratory for condensed {2. Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

Monoclinic phase LiFeSO4F was synthesized by a simple fast solid state reaction from the mixture of FeSO4·7H2. and LiF pulverized by high energy ball milling.m-LiFeSO4F was confirmed by GITT measurement to be a 3.9 V polyanion-type cathode materials for Li-ion *** electrochemical activity can be enhanced by addition of carbon.A discharge capacity of 105 mA·h/g (70%of theoretical value) was achieved for a m-LiFeSO4F/CNT *** separation behavior during lithium extraction and insertion was observed by ex-situ XRD test.

关键词： LiFeSO4F polyanion cathode Li-ion battery