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作者： Chang, Li-Chung Hsieh, Yu-Chi Chen, Yong-Min Wu, Pu-Wei Lee, Jyh-Fu Graduate Program for Science and Technology of Accelerator Light Source China Department of Materials Science and Engineering National Chiao Tung University Hsin-Chu 30010 Taiwan Taiwan National Synchrotron Radiation Research Center Hsin-Chu 30076 Taiwan Taiwan

ISBN: (纸本)9781607685395

Fabrication of graphene was demonstrated by electrochemical exfoliation of graphite in an ammonium hydroxide solution. The processing parameter of applied voltage was optimized to accomplish graphene productivity and desired chemical composition. Images from the atomic force microscopy showed graphene sheets with lateral sizes of several hundred nanometers. Images from the transmission electron microscopy indicated the existence of stacked graphene sheets with thickness of a few graphene layers. Raman spectroscopy confirmed variation of assynthesized graphene and bulk graphite. X-ray photoemission spectroscopy suggested the formation of graphene oxide at large voltage. © 2014 The Electrochemical Society.

关键词： Graphene

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Characterization of magnetic properties of Sr2CuWO6 and Sr2CuMoO6

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Physical Review B 2014年第13期89卷 134419-134419页

作者： Sami Vasala Hassan Saadaoui Elvezio Morenzoni Omar Chmaissem Ting-Shan Chan Jin-Ming Chen Ying-Ya Hsu Hisao Yamauchi Maarit Karppinen Department of Chemistry Aalto University FI-00076 AALTO Finland Laboratory for Muon Spin Spectroscopy Paul Scherrer Institute CH-5232 Villigen PSI Switzerland Department of Physics Northern Illinois University DeKalb Illinois 60115 USA Materials Science Division Argonne National Laboratory Argonne Illinois 60439 USA National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan Program for Science and Technology of Accelerator Light Source National Chiao Tung University Hsinchu 30076 Taiwan

In this work we examine the low-temperature magnetic properties of the two double-perovskite compounds Sr2CuWO6 and Sr2CuMoO6 using magnetic susceptibility, muon spin rotation and relaxation, and neutron powder diffraction measurements. Additionally, the most relevant spin exchange interaction constants are derived from ab initio electronic structure calculations, aided by x-ray absorption spectroscopy. The compounds exhibit quasi-two-dimensional magnetic properties, with broad maxima at Tmax = 83 and 95 K for Sr2CuWO6 and Sr2CuMoO6, respectively. However, three-dimensional long-range order takes place below TN = 24(1) and 28(2) K for Sr2CuWO6 and Sr2CuMoO6, respectively. Our results show that the low-dimensional magnetic correlations are mainly due to the significant next-nearest-neighbor interactions in the ab plane of the double-perovskite structure, whereas three-dimensional long-range magnetic order is caused by weaker next-nearest-neighbor interactions along the c axis. Next-nearest-neighbor interactions are also slightly frustrated by weaker nearest-neighbor interactions within the ab plane. Based on these results we predict the low-temperature magnetic structure in these compounds to be type-II antiferromagnetic order of the double-perovskite lattice.

关键词： MAGNETIC properties LOW temperatures OXIDE minerals PEROVSKITE MAGNETIC susceptibility

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Fabrication and ferroelectric properties of BiFeO3/LaNiO 3 artificial superlattice structures grown by radio-frequency magnetron-sputtering

Fabrication and ferroelectric properties of BiFeO3/LaNiO 3 a...

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作者： Liu, Yen-Ting Chiu, Shang-Jui Lee, Hsin-Yi Chen, San-Yuan Program for Science and Technology of Accelerator Light Source National Chiao Tung University Hsinchu Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu Taiwan National Synchrotron Radiation Research Center Hsinchu Taiwan Department of Materials Science and Engineering National Chiao Tung University Hsinchu Taiwan

Symmetric superlattice structures of multiferroic BiFeO3 and conductive LaNiO3 sublayers were grown on a Nb-doped SrTiO 3 substrate with radio-frequency magnetron-sputtering. The formation of a superlattice structure was confirmed from the appearance of satellite lines on both sides of the main line in the X-ray diffraction pattern. X-ray measurements show that these superlattice films become subject to greater tensile stress along the c-axis and to increased compressive stress parallel to the surface plane with a decreasing thickness of the sublayer. The smaller is the thickness of the sublayer, the greater is the crystalline quality and the strain state. The hysteresis loops show a large leakage current at frequencies of 0.5 and 1 kHz;the polarization decreases with an increasing frequency. © 2012 Elsevier B.V.

关键词： X ray scattering

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The structure and ferroelectric property of La-doped BiFeO 3/SrTiO3 artificial superlattice structure by rf sputtering: Effect of deposition temperature

The structure and ferroelectric property of La-doped BiFeO 3...

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作者： Chiu, Shang-Jui Liu, Yen-Ting Yu, Ge-Ping Lee, Hsin-Yi Huang, Jia-Hong Department of Engineering and System Science National Tsing Hua University Hsinchu 30013 Taiwan National Synchrotron Radiation Research Center Hsinchu Science Park 101 Hsin-Ann Road Hsinchu 30076 Taiwan Program for Science and Technology of Accelerator Light Source National Chiao Tung University Hsinchu 300 Taiwan Institute of Nuclear Engineering and Science National Tsing Hua University Hsinchu 30013 Taiwan

Improvement of ferroelectric property by Lanthanum (La)-doping of BiFeO3 (BFO) and strain effect of high quality superlattice films deposited at temperature â‰§ 700 C was shown in this study. The in-pane (200) radial scans showed that films at deposition temperature above 700 C behaved high strained ∼-1.4% and showed epitaxity properties. The La-doped BFO superlattice structure also behaved higher polarization value ∼ 197 μC/cm2 and lower leakage current density comparing with BFO superlattice structure shown in our previous study. The ferroelectric properties of superlattice structures are enhanced by lattice strain and strongly correlated with the defect state of films. © 2012 Elsevier B.V.

关键词： Semiconductor doping

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Fabrication of Graphene by Electrochemical Exfoliation in Alkaline Electrolytes

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ECS Transactions 2013年第24期58卷

作者： Li-Chung Chang Yu-Chi Hsieh Yong-Min Chen Pu-Wei Wu Jyh-Fu Lee Graduate Program for Science and Technology of Accelerator Light Source National Chiao Tung University Department of Materials Science and Engineering National Chiao Tung University National Synchrotron Radiation Research Center

Fabrication of graphene was demonstrated by electrochemical exfoliation of graphite in an ammonium hydroxide solution. The processing parameter of applied voltage was optimized to accomplish graphene productivity and desired chemical composition. Images from the atomic force microscopy showed graphene sheets with lateral sizes of several hundred nanometers. Images from the transmission electron microscopy indicated the existence of stacked graphene sheets with thickness of a few graphene layers. Raman spectroscopy confirmed variation of as-synthesized graphene and bulk graphite. X-ray photoemission spectroscopy suggested the formation of graphene oxide at large voltage.

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Fabrication of Dealloyed Pt2os Nanoparticles for Oxygen Reduction Reaction in Acidic Electrolytes

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ECS Meeting Abstracts 2013年第3期MA2013-02卷

作者： Yi-Juei Lee Yu-Chi Hsieh Yu Sun Li-Chung Chang Pu-Wei Wu Jyh-Fu Lee Department of Materials Science and Engineering National Chiao Tung University Department of Materials Science and Engineering National Chiao Tung University 1001 Ta Hsueh Road Hsinchu City Taiwan 300 Graduate Program for Science and Technology of Accelerator Light Source National Chiao Tung University Graduate Program for Science and Technology of Accelerator Light Source National Chiao Tung University 1001 Ta Hsueh Road Hsinchu City Taiwan 300 National Synchrotron Radiation Research Center 101 Hsin-Ann Road Hsinchu Science Park Hsin-Chu 30076 Taiwan ROC

Abstract not Available.

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Time-resolved optical response of all-oxide YBa2Cu3O7/La0.7Sr0.3MnO3 proximitized bilayers

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Physical Review B 2013年第13期87卷 134514-134514页

作者： L. Parlato R. Arpaia C. De Lisio F. Miletto Granozio G. P. Pepe P. Perna V. Pagliarulo C. Bonavolontà M. Radovic Y. Wang Roman Sobolewski U. Scotti di Uccio CNR-SPIN and Dipartimento di Scienze Fisiche Complesso Universitario di Monte Sant'Angelo Via Cinthia I-80125 Napoli Italy IMDEA-Nanociencia Campus Universidad Autonóma de Madrid 28049 Madrid Spain Swiss Light Source Paul Scherrer Institute CH-5232 Villigen PSI Switzerland and Laboratory for Synchrotron and Neutron Spectroscopy EPFL Lausanne Switzerland Materials Science Graduate Program and Laboratory for Laser Energetics University of Rochester Rochester New York 14627-0231 USA Institute of Electron Technology PL-02668 Warszawa Poland and the University of Rochester Rochester New York 14627-0231 USA

We present femtosecond pump–probe spectroscopy studies of time-resolved optical reflectivity of all-oxide YBa2Cu3O7/La0.7Sr0.3MnO3 (YBCO/LSMO) superconductor/ferromagnet (S/F) bilayers consisting of a 100-nm-thick YBCO base layer and either 10 or 35 nm LSMO cap thickness. At temperatures far below the YBCO superconducting transition TC, samples with a 10 nm F overlayer show a photoresponse that is similar to, but faster than, pure-YBCO, 100-nm-thick reference samples, while close to TC and above (up to ∼160 K) we observe a signature of both the electronic and spin response that cannot be interpreted as an incoherent sum of contributions from the two layers. The photoresponse of the S/F structures with the 35-nm LSMO layer always qualitatively follows that of the pure LSMO, but with a shorter relaxation time. In all cases, the YBCO/LSMO nonequilibrium dynamics can be modeled using a generalized multitemperature model, which is a superposition of the dynamics of the three-temperature models that are used to describe the superconductor and ferromagnet subsystems, respectively. The long term of the photoresponse signal of the S/F bilayer can be well fitted with the two characteristic relaxation times.

关键词： SUPERCONDUCTORS FERROMAGNETIC materials FERROMAGNETISM FERROMAGNETIC resonance CONDENSED matter

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Electronic structure of the metallic antiferromagnet PdCrO2 measured by angle-resolved photoemission spectroscopy

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Physical Review B 2013年第12期88卷 125109-125109页

作者： J. A. Sobota K. Kim H. Takatsu M. Hashimoto S.-K. Mo Z. Hussain T. Oguchi T. Shishidou Y. Maeno B. I. Min Z.-X. Shen Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park California 94025 USA Geballe Laboratory for Advanced Materials Departments of Physics and Applied Physics Stanford University Stanford California 94305 USA Department of Physics Pohang University of Science and Technology Pohang 790-784 Korea Department of Physics Tokyo Metropolitan University Tokyo 192-0397 Japan Department of Physics Graduate School of Science Kyoto University Kyoto 606-8502 Japan Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park California 94025 USA Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA Institute of Scientific and Industrial Research Osaka University 8-1 Mihogaoka Ibaraki Osaka 567-0047 Japan Department of Quantum Matter ADSM Hiroshima University Higashi-Hiroshima 739-8530 Japan

PdCrO2 is material which has attracted interest due to the coexistence of metallic conductivity associated with itinerant Pd 4d electrons and antiferromagnetic order arising from localized Cr spins. A central issue is determining to what extent the magnetic order couples to the conduction electrons. Here we perform angle-resolved photoemission spectroscopy (ARPES) to experimentally characterize the electronic structure. We find that the Fermi surface has contributions from both bulk and surface states, which can be experimentally distinguished and theoretically verified by slab band structure calculations. The bulk Fermi surface shows no signature of electronic reconstruction in the antiferromagnetic state. This observation suggests that there is negligible interaction between the localized Cr spin structure and the itinerant Pd electrons measured by ARPES.

关键词： PHOTOEMISSION PHOTOELECTRICITY ELECTRIC conductivity ELECTRONS ANTIFERROMAGNETIC materials

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Fabrication of Graphene By Electrochemical Exfoliation in Alkaline Electrolytes

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ECS Meeting Abstracts 2013年第41期MA2013-02卷

作者： Li-Chung Chang Yu-Chi Hsieh Yong-Min Chen Pu-Wei Wu Jyh-Fu Lee Graduate Program for Science and Technology of Accelerator Light Source National Chiao Tung University 1001 Ta Hsueh Road Hsinchu City Taiwan 300 Department of Materials Science and Engineering National Chiao Tung University 1001 Ta Hsueh Road Hsinchu City Taiwan 300 National Synchrotron Radiation Research Center 101 Hsin-Ann Road Hsinchu Science Park Hsin-Chu 30076 Taiwan ROC

Abstract not Available.

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The development of synchrotron-assisted scanning probe microscopy at NSRRC

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Journal of Physics: Conference Series 2013年第1期463卷

作者： Yuet-Loy Chan Xihui Liang Tsung-Hsuan Wu Dah-An Lu Meng-Fan Luo Yao-Jane Hsu D H Wei National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan Department of Physics National Central University Taoyuan 32001 Taiwan Department of Physics National Sun Yat-sen University Kaohsiung 80424Taiwan Graduate Program for Science and Technology of Synchrotron Light Source National Tsing Hua University 30013 Hsinchu Taiwan

Synchrotron-based X-ray microspectroscopy is a technique that brings together microscopy and X-ray spectroscopy. It can be considered as an experimental approach capable of extracting X-ray spectrum from a finite area, or an alternative way of constructing images with spectroscopic contrast. The goal of this project is to integrate the functions of scanning tunnelling electron microscope (STM) with near edge X-ray absorption fine structure (NEXAFS) spectroscopy. Here, we describe our experimental setup, followed by recent results that demonstrate the feasibility of acquiring NEXAFS spectrum with a SiO2 coated STM tip.

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