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Nano Research 2016年第10期9卷 3171-3178页

作者： Rouzhaji Tuerhong Shawulienu Kezilebieke Bernard Barbara Jean-Pierre Bucher institut Universitaire de France Universite de Strasbourg 23 rue du Loess F-67034 Strasbourg France institut neel CNRS Universite Grenoble-Alpes F-38042 Grenoble France

Voltage-controlled conductance and switching induced by single molecules or atoms are ideally studied in scanning tunneling microscope （STM） tunnel junctions. While the objects under consideration are mostly used in their original form, little is known of the possibilities of in situ adjustments of their properties. Here, we evidence properties of a tunnel junction made of a Ce atom/cluster built by atomic manipulation on Au（111） at a temperature of 4.6 K in the presence of H2. The conductance through the object is characterized by a switching voltage corresponding to an opening or closing of an inelastic electron tunneling conductance channel at 50 mV for a Ce atom and 140 mV for a Ce cluster and by charging. We demonstrate that the electronic properties of an STM junction can be engineered in a simple way by in situ guiding of the H2 pinning at an atomic cluster.

关键词： conductance hysteresis inelastic electron tunelingspectroscopy (IETS) switching Ce clusters scanning tunneling microscope (STM)/scanning tunneling spectroscopy (STS)

Age stability of La(Fe,Si)_(13) hydrides with giant magnetocaloric effects

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Rare Metals 2022年第3期41卷 992-1001页

作者： He Zhou Yi Long Salvatore Miraglia Florence Porcher Hu Zhang School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Tianjin College University of Science and Technology BeijingTianjin 301830China CNRS Institut NeelUniversite Grenoble Alpes25 Rue des Martyrs38042 GrenobleFrance Laboratoire Leon Brillouin UMR12 CEA-CNRSBat.563 CEA Saclay91191 Gif sur Yvette CedexFrance

The Curie temperatures(T_(C))of La_(0.7)Ce_(0.3)Fe_(13-x-y)Mn_(x)Si_(y)compounds that are hydrogenated to saturation are raised to near room *** age stability was inves-tigated for the fully hydrogenated La_(0.7)Ce_(0.3)Fe_(11.5-x)Mn_(x)Si_(1.5) *** result indicates that the H content will slowly decrease in the hydrides,leading to a decrease in T_(C).However,no age splitting is observed after the hydrides are held at room temperature for two years,indicating the excellent age stability of the *** structural analysis by neutron diffrac-tion shows that Mn atoms preferentially substitute Fe in the 96i *** T_(C)of La_(0.7)Ce_(0.3)Fe_(11.55-y)Mn_(y)Si_(1.45)hydrides can be adjusted to the desired working temperature by regulating Mn content based on the linear relationship between T_(C)and Mn ***,the La_(0.7)Ce_(0.3)Fe_(11.55-y)Mn_(y)Si_(1.45)hydrides exhibit a giant magnetic entropy change of 15 J·kg^(-1)·K^(-1) under a low magneticfield change of 0-1 *** a result,the giant magnetocaloric effect,linearly adjustable T_(C),and excel-lent age stability make the La_(0.7)Ce_(0.3)Fe_(11.55-y)Mn_(y)Si_(1.45)hydrides be one of the ideal candidates for room temperature magnetic refrigerants.

关键词： Magnetocaloric effect La(Fe,Si)_(13) Hydrides Stability

Study of electronic and magnetic properties of MnS layers

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Chinese Physics B 2012年第12期21卷 408-411页

作者： R.Masrour E.K.Hlil M.Hamedoun A.Benyoussef O.Mounkachi Laboratory of Materials ProcessesEnvironment and QualityCady Ayyed UniversityNational School of Applied SciencesSafiMorocco LMPHE(URAC 12) Faculty of ScienceMohammed V-Agdal UniversityRabatMorocco institut neel CNRS et Universite Joseph FourierBP 166F-38042 Grenoble Cedex 9France institute of Nanomaterials and Nanotechnologies MAScIRRabatMorocco HassanⅡAcademy of Science and Technology RabatMorocco

Self-consistent ab initio calculations, based on the density functional theory （DFT） and using the full potential linear augmented plane wave （FLAPW） method, are performed to investigate both electronic and magnetic properties of the MnS layers. Polarized spin and spin-orbit coupling are included in the calculations within the framework of the antiferromagnetic state between two adjacent Mn layers. Magnetic moments considered to lie along axes are computed. Obtained data from ab initio calculations are used as input data for the high temperature series expansion （HTSE） calculations to compute other magnetic parameters. The zero-field high temperature static susceptibility series of the spin-4.39 nearest-neighbour Heisenberg model on centred face cubic （FCC） and lattices is thoroughly analysed by a power series coherent anomaly method （CAM）. The exchange interactions between the magnetic atoms, the N@el temperature, and the critical exponent associated with the magnetic susceptibility are obtained for the MnS layer.

关键词： MnS layers electronic and magnetic structure magnetic moment N^el temperature,exchange interactions

Neutron Diffraction Investigation of the DyFe11Ti Magnetic Structure and Its Spin Reorientations

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Engineering 2020年第2期6卷 154-158页

作者： Olivier Isnard Eder J.Kinast University Grenoble Alpes Institut Neel du CNRS25 rue des MartyrsGrenoble 38042France Universidade Estadual do Rio Grande do Sul Porto AlegreRS 90010-191Brazil

In this article,we report on the magnetic structure of DyFe11Ti and its thermal evolution as probed by neutron powder diffraction.A thermodiffraction technique was used to follow the temperature dependence of the magnetic moments,as well as their *** Dy and Fe moments were coupled to each other in an antiparallel manner to form a ferrimagnet,where the easy magnetization direction at 2 K was the[110]axis in the basal(a,b)*** magnetic structure underwent two successive spin reorientation phenomena with increasing temperature.A large Dy magnetic moment of 9.7 Bohr magneton(μB)was obtained at low temperatures,and the magnitude decreased rapidly to 7.5μB at 200 *** largest Fe magnetic moment was observed on the Fe 8i position.A ThMn12-type crystal structure was preserved in the studied temperature range,despite the large changes of the magnetic structure.A sharp tilt was observed at the first-order spin reorientation,TSR1;the angle between the easy magnetization axis and the crystal c axis was reduced from 90°at 2 K to about 20°at 200 K(where c is the easy axis above 200 K);and the Dy and Fe magnetic moments maintained an antiparallel coupling.

关键词： Neutron diffraction Magnetic phase diagram Crystal structure

Nb扩散层对MgB2/Nb/Cu线材超导电性的影响(英文)

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稀有金属材料与工程 2013年第5期42卷 881-884页

作者：王庆阳张平祥闫果 A.Sulpice 熊晓梅杨芳刘国庆焦高峰李成山西北工业大学西北有色金属研究院 institut neel/CNRS-UJF B.P.16638042 Grenoble Cedex 9France CRETA CNRSBP.16638042 Grenoble Cedex 9France

采用原位法粉末装管工艺(in-situ PIT),以Nb/Cu复合管作为包套材料制备了MgB2超导线材并且在氩气保护气氛中,不同温度条件下保温2h进行成相热处理。分别采用电阻-温度测试、磁矩转变测试、临界传输电流测试以及Nb-MgB2界面磁光研究等分... 详细信息

采用原位法粉末装管工艺(in-situ PIT),以Nb/Cu复合管作为包套材料制备了MgB2超导线材并且在氩气保护气氛中,不同温度条件下保温2h进行成相热处理。分别采用电阻-温度测试、磁矩转变测试、临界传输电流测试以及Nb-MgB2界面磁光研究等分析手段进行研究。结果表明:当热处理温度高于750℃时,在MgB2超导芯丝和Nb阻隔层之间形成一个扩散层,该扩散层的存在阻碍了电流的传输,从而导致在磁测法测试中可以检测到超导相存在,而在传输法测试中无法看到超导传输现象。说明采用Nb作为MgB2超导线带材的扩散阻隔层时其热处理温度不能高于750℃。

关键词： MgB2 Nb Cu超导线材,超导电性无定形碳掺杂

Vasarely painting at the nanoscale on sapphire crystals

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Nano Research 2020年第9期13卷 2512-2516页

作者： Caroline Matringe Elsa Thune Rémy Cavalotti Ahmad Fakih Stephan Amaud Nils Blanc Nathalie Boudet Alessandro Coati Yves Garreau David Babonneau René Guinebretière IRCER UMR CNRS 7315Centre Europeen de la CeramiqueUniversite de Limoges12 rue Atlantis87068 LimogesFrance institut neel UPR CNRS 2940 CRG D2AM BeamlineESRFUniversite Grenoble Alpes38042 GrenobleFrance SixS Beamline Synchrotron SOLEILBP4891192 Gifsur YvetteFrance Laboratoire Materiaux et Phenomenes Quantiques UMR CNRS 7162Universite de Paris75013 ParisFrance institut Pprime Departement Physique et Mecanique des Materiauxf UPR CNRS 3346Universite de PoitiersSP2MITSA 4112386073 Poitiers Cedex 9France

We demonstrate that convenient thermal treatment of a specific sapphire vicinal surface can induce the formation of a fully two-dimensional(2D)ordered surface made of a periodic assembly of(006)*** simiarity between the resuting surface topography and pattemns represented in the hexagon series"of paintings by Vasarely is really striking!We thus propose to call these surfaces as"nanoscaled Vasarely surfaces".We also show that the self-organization process,which is driven by the minimization of the free energy of a closed system,results in a quasi-linear isothermal growth of the facets'surface area over time.

关键词： nanoscaled Vasarely surfaces two-dimensional(2D)-self-organization sapphire vicinal surfaces

NZ2合金在不同介质中腐蚀后氧化膜的晶体结构

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材料研究学报 2008年第3期22卷 327-332页

作者：章海霞李中奎张建军郑欣 FRUCHART Daniel HLIL El Kebir 孙军周廉西安交通大学材料科学与工程学院西安710049 西北有色金属研究院西安710016 institut neel CNRS BP 16638042 GrenobleCedex 9France

通过分析NZ2合金在360℃、18.6 MPa含锂水和400℃、10.3 MPa蒸汽中腐蚀后氧化膜的晶体结构,研究了腐蚀过程中氧化膜晶体结构的转变及其对锆合金耐腐蚀性能的影响.结果表明:NZ2合金腐蚀后氧化膜的结构以单斜氧化锆为主,还有一定量畸变了... 详细信息

通过分析NZ2合金在360℃、18.6 MPa含锂水和400℃、10.3 MPa蒸汽中腐蚀后氧化膜的晶体结构,研究了腐蚀过程中氧化膜晶体结构的转变及其对锆合金耐腐蚀性能的影响.结果表明:NZ2合金腐蚀后氧化膜的结构以单斜氧化锆为主,还有一定量畸变了的四方氧化锫.四方氧化锆主要由氧化膜内的压应力稳定.随着腐蚀时间的延长,氧化膜与金属间的界面向前推进,当氧化锆中的压应力不足以稳定四方相时,四方氧化锆转变为单斜氧化锆.从氧化膜与金属间的界面到氧化膜的外表面,四方相的含量不断降低,界面处的四方相含量最高.NZ2合金在360℃含锂水中腐蚀时,氧化膜内四方相向单斜相的转变速度比在400℃蒸汽中腐蚀时四方相向单斜相的转变速度低得多.四方相向单斜相的转变是决定锆合金抗腐蚀性能的主要因素,四方相转变得越快,其含量越低,腐蚀速率越高.

关键词：材料失效与保护氧化膜晶体结构腐蚀性能 Raman光谱

Sequential trapping of single nanoparticles using a gold plasmonic nanohole array

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Photonics Research 2018年第10期6卷 981-986页

作者： XUE HAN VIET GIANG TRUONG PRINCE SUNIL THOMAS SILE NIC CHORMAIC Light-Matter Interactions Unit Okinawa Institute of Science and Technology Graduate University Onna Okinawa 904-0495 Japan Universite Grenoble Alpes CNRS Grenoble INP Institut Neel 38000 Grenoble France Advanced Optical Imaging Group School of Physics University College Dubfin Ireland

We have used a gold nanohole array to trap single polystyrene nanoparticles, with a mean diameter of 30 nm, into separated hot spots located at connecting nanoslot regions. A high trap stiffness of approximately 0.85 fN∕(nm·m W)at a low-incident laser intensity of ～0.51 m W∕μm^2 at 980 nm was obtained. The experimental results were compared to the simulated trapping force, and a reasonable match was achieved. This plasmonic array is useful for lab-on-a-chip applications and has particular appeal for trapping multiple nanoparticles with predefined separations or arranged in patterns in order to study interactions between them.

关键词：金纳米孔聚苯乙烯纳米粒子通讯技术发展现状

Nb芯增强MgB2多芯超导线材的制备及性能研究

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低温物理学报 2011年第3期33卷 199-202页

作者：王庆阳闫果 A.Sulpice 刘国庆焦高峰熊晓梅冯勇张平祥西北工业大学材料学院西北有色金属研究院 institut neel/CNRS-UJF B.P.16638042 Grenoble France

以Nb/Cu复合管作为外包套材料,Nb棒作为中心增强体,通过原位法粉末装管工艺(in-situ PIT)制备了不同芯丝结构的TiC粉末掺杂MgB2/NbCu多芯线材.在高纯流动氩气保护条件下、700℃烧结2h进行成相反应.对烧结后的线材分别进行了应力-应变分... 详细信息

以Nb/Cu复合管作为外包套材料,Nb棒作为中心增强体,通过原位法粉末装管工艺(in-situ PIT)制备了不同芯丝结构的TiC粉末掺杂MgB2/NbCu多芯线材.在高纯流动氩气保护条件下、700℃烧结2h进行成相反应.对烧结后的线材分别进行了应力-应变分析、微观结构以及超导电性等分析检测.拉伸实验分析表明,Nb芯增强可以有效提高MgB2线材的应力-应变性能.微观结构分析显示,通过该工艺制备的MgB2多芯超导线材具有良好的晶粒连结性和较高的致密度,采用四引线法测试了该线材在4.2K的超导临界传输电流,实验结果证明该工艺可以进行实用化MgB2多芯超导长线的制备.

关键词： Nb芯增强多芯线材 MgB2超导体超导电性

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MgB_2多芯超导线带材研究进展

材料导报 2011年第17期25卷 33-36,50页

作者：王庆阳闫果 A.Sulpice 张平祥西北工业大学材料学院西北有色金属研究院 institut neel/CNRS-UJF B.P.16638042 Grenoble Cedex 9France

回顾了近年来多芯MgB2超导线带材的主要研究进展,分析了包套材料的选取原则;比较了粉末套管法(PIT)、连续粉末装管成型工艺(CTFF)及中心镁扩散工艺(IMD)等几种常用的MgB2线带材加工制备技术的特点;评述了多芯MgB2线带材的磁通钉扎性能... 详细信息

回顾了近年来多芯MgB2超导线带材的主要研究进展,分析了包套材料的选取原则;比较了粉末套管法(PIT)、连续粉末装管成型工艺(CTFF)及中心镁扩散工艺(IMD)等几种常用的MgB2线带材加工制备技术的特点;评述了多芯MgB2线带材的磁通钉扎性能、交流损耗、稳定性与失超传播以及力学性能等方面的研究进展;同时简要回顾了多芯MgB2超导线带材的应用研究现状。

关键词：二硼化镁超导体多芯线带材研究进展