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Superconductivity in Ti-doped iron-arsenide compound Sr_4Cr_(0.8)Ti_(1.2.O_6Fe_2.s_2

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Science china(physics,Mechanics & Astronomy) 2009年第12期52卷 1876-1878页

作者： ZHU XiYu,HAN Fei,MU Gang,CHENG Peng,SHEN Bing,ZENG Bin & WEN HaiHu National Laboratory for Superconductivity,institute of physics,Chinese Academy of Sciences,{2. 100190,{3. {2. Na-tional Laboratory for condensed matter physics,institute of physics,Chinese Academy of Sciences,{2. 100190,{3. National Laboratory for Superconductivity Institute of Physics Chinese Academy of Sciences Beijing China beijing National Laboratory for condensed {2.{3. Institute of Physics Chinese Academy of Sciences Beijing China

Superconductivity was achieved in Ti-doped iron-arsenide compound Sr4Cr0.8Ti1.2.6Fe2.s2.(abbreviated as Cr-FeAs-42.2.). The X-ray diffraction measurement shows that this material has a layered structure with the space group of P4/nmm,and with the lattice constants a = b = 3.9003. and c = 15.83.6 . Clear diamagnetic signals in ac susceptibility data and zero-resistance in resistivity data were detected at about 6 K,confirming the occurrence of bulk superconductivity. Meanwhile we observed a supercon-ducting transition in the resistive data with the onset transition temperature at 2..2.K,which may be induced by the nonuniform distribution of the Cr/Ti content in the FeAs-42.2. phase.

关键词： iron-based superconductor high-temperature superconductor Perovskite

Exotic structure of the third excited state in^(2.)Na

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Chinese Science Bulletin 2005年第23期50卷 2677-2680页

作者： LI Xihan1,2.3. LIANG Yujie1,2.3. DENG Fuguo1,2.3. LIU Zuhua1,4 & ZHOU Hongyu1,2.3.1. Key Laboratory of Beam Technology and Material Modification of Minister of Education, beijing Normal University, beijing 100875,{2. 2. {3. of Low Energy Nuclear physics, and Department of Material Science and Engineering, beijing Normal University, beijing 100875,{2. 3. beijing Radiation center, beijing 100875,{2. 4.{2. {3. of Atomic Energy, beijing 102.13.{2. Key Laboratory of Beam Technology and Material Modification of Minister of Education Beijing Normal University Beijing 100875 China institute of Low Energy Nuclear physics Department of Material Science and Engineering Beijing Normal University Beijing 100875 China beijing Radiation center Beijing 100875 China china institute of Atomic Energy Beijing 102413 China

The probability of the last proton being out of the binding potential, P and the root-mean-square (rms) ra- dius (1/2. of the third excited state in 2.Na are calcu- lated by means of asymptotic normalization coefficie... 详细信息

The probability of the last proton being out of the binding potential, P and the root-mean-square (rms) ra- dius (2.1/2. of the third excited state in 2.Na are calcu- lated by means of asymptotic normalization coefficient (ANC) method with the experimental date existing. The results are P=54.73. and 2.1/2.5.2. fm respectively. The P value and the contribution of the asymptotic part to the 2.1/2.are compared with those of several other low energy states in 2.Na. It is found that the valence particle in the third excited state has an obvious larger P than those of other states. The density distribution of the valence proton in this state is also compared with the nucleons in the nuclear core 2.Ne, and a far extended tail can be seen clearly. These results show that the third ex- cited state in 2.Na is a proton halo state.

关键词：钠第三激发态外部结构有效半径密度分布渐近标准化系数

Inconsistency between WMAP data and released map

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Chinese Science Bulletin 2010年第10期55卷 907-909页

作者： LIU Hao1 & LI TiPei1,2.3.1 Key Laboratory of Particle Astrophysics,institute of High Energy physics,Chinese Academy of Sciences,beijing 100049,china 2.Department of physics & center for Astrophysics,Tsinghua University,beijing 100084,china 3.Department of Engineering physics & center for Astrophysics,Tsinghua University,beijing 100084,china Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing China Department of physics & center for Astrophysics Tsinghua University Beijing China Department of Engineering physics & center for Astrophysics Tsinghua University Beijing China

A remarkable inconsistency between the calibrated differential time-ordered data (TOD) of the Wilkinson Microwave Anisotropy Probe (WMAP) mission,which is the input for map-making,and the cosmic microwave background (CMB) temperature maps published by the WMAP team is revealed,indicating that there must exist a serious problem in the map making routine of the WMAP *** inconsistency is easy to be confirmed without the use of WMAP map-making *** view of the importance of this issue for cosmology study,we invite readers to check it by themselves.

关键词：威尔金森微波各向异性探测器 WMAP 地图制作宇宙微波背景有序数据制作软件 TOD CMB

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.{3. 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

Colossal magnetoresistance and spin-glass properties of La(1-x)TexMnO3.x=0.04,0.1)

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Chinese Science Bulletin 2003年第13期48卷 1321-1324页

作者： TAN Guotai, DUAN Peng, DAI Shouyu, CHEN Zhenghao, LU Huibin & ZHOU Yueliang Laboratory of Optical physics, institute of physics & {2. for{3. matter physics, Chinese Academy of Sciences, beijing 100080, china Correspondence should be addressed to Chen Zhenghao (e-mail: zhchen @***) Laboratory of Optical physics Center for Condensed Matter Physics Chinese Academy of Sciences Beijing 100080 China

For the first time, a novel material of La1-x- TexMnO3.(x = 0.04, 0.1), in which the La ions are replaced by the nonmetal element Te in the Chalcogen, has been synthesized. The material has a rhombohedral lattice with the space group of R3., and Te ions have a tetravalence state. The curves of the resistivity vs. temperature indicate that this material has the property of a metal-semiconductor transition and the colossal magnetoresistance (CMR) effect. The maximum magnetoreistance ratio MR=[(0)()]/(0)H? is about 51% at 4 T for x = 0.1. Besides, a spin-glass behavior at low magnetic fields is observed in this compound.

关键词：巨磁电阻 La1-xTexMnO3 镧碲物理性质

Superconductivity at 3. K in gadolinium-arsenide oxides GdO_(1-x)F_xFeAs

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Science china(physics,Mechanics & Astronomy) 2008年第6期51卷 719-722页

作者： CHENG Peng, FANG Lei, YANG Huan, ZHU XiYu, MU Gang, LUO HuiQian, WANG ZhaoSheng & WEN HaiHu National Laboratory for Superconductivity, institute of physics, Chinese Academy of Sciences, beijing 100190,{2. beijing National Laboratory for condensed matter physics, institute of physics, Chinese Academy of Sciences, beijing 100190,{2. National Laboratory for Superconductivity Institute of Physics Chinese Academy of Sciences Beijing China beijing National Laboratory for condensed {2.{3. Institute of Physics Chinese Academy of Sciences Beijing China

In this paper we report the fabrication and superconducting properties of GdO1-xFxFeAs. It was found that when x is equal to 0.17, GdO0.83.0.17FeAs is a su-perconductor with the onset transition temperature Tcon ≈ 3..6 K. Resistivity anomaly near 13. K was observed for all samples up to x = 0.17, and such a phenomenon is similar to that of LaO1-xFxFeAs. Hall coefficient indicates that GdO1-xFxFeAs is conducted by electron-like charge carriers.

关键词： iron-based superconductor high-temperature superconductor

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. {3., institute of physics, Chinese Academy of Sciences, beijing 100080, china 2.Department of Mathematics and {3., 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.{3. 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

CeO_2.thin films grown on biaxially textured nickel(001)

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Chinese Science Bulletin 1998年第20期43卷 1718-1722页

作者： WANG Rongping, XIONG Xuming, Guo Xiangxin, ZHOU Yueliang, L Huibin, PAN Shaohua, CHEN Zhenghao and YANG Guozhen Laboratory of Optical physics, institute of physics and {2. for{3. matter physics, Chinese Academy of Sciences, beijing 100080, Ch Laboratory of Optical physics Institute of Physics and Center for Condensed Matter Physics Chinese Academy of Sciences Beijing China

CeO\-2.films have been grown on biaxially textured Ni substrates at various temperatures. The results show that CeO\-2.films without IBAD are dominated by (111) orientation from room temperature to 800℃ while the preferential orientation of CeO\-2.films with IBAD is (001) at lower deposition temperature and (111) at deposition temperature higher than 450℃. CeO\-2.films with better in_plane texture and out_of_plane orientation can be grown at 3.0℃ with 2.0 eV ion energy and 2.0 μA/cm\+2.ion current density.

关键词： CeO\-2 films biaxial nickel.

New quantum tunneling steps in Mn_(11)Cr/Mn_(12. mixed crystal

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Science china(physics,Mechanics & Astronomy) 2010年第9期53卷 1769-1771页

作者： ZHOU YuRong1,LI YanRong1,FAN ZhenJun2.& WANG YunPing1 1beijing National Laboratory for condensed {2. {3.,institute of {3.,Chinese Academy of Sciences,beijing 100190,china 2.chool of Materials Sciences and Technology,china University of Geosciences,beijing 43.074,china beijing National Laboratory for condensed {2.{3. Institute of Physics Chinese Academy of Sciences Beijing China School of Materials Sciences and Technology China University of Geosciences Beijing China

Magnetic properties of Mn11Cr and Mn12.mixed crystal at low temperature are studied.A new set of quantum tunneling steps discovered in magnetization curves suggests that there may exist another kind of single molecula... 详细信息

关键词： quantum tunneling molecular magnet magnetization curve