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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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Valence transitions in the heavy-fermion compound YbCuAl as a function of temperature and pressure

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Physical Review B 2013年第20期87卷 205120-205120页

作者： Hitoshi Yamaoka Naohito Tsujii Yuki Utsumi Hitoshi Sato Ignace Jarrige Yoshiya Yamamoto Jung-Fu Lin Nozomu Hiraoka Hirofumi Ishii Ku-Ding Tsuei Jun'ichiro Mizuki RIKEN/SPring-8 Sayo Hyogo 679-5148 Japan Quantum Beam Center National Institute for Materials Science 1-2-1 Sengen Tsukuba 305-0047 Japan Graduate School of Science Hiroshima University Higashi-Hiroshima 739-8526 Japan Hiroshima Synchrotron Radiation Center Hiroshima University Higashi-Hiroshima 739-0046 Japan National Synchrotron Light Source II Brookhaven National Laboratory Upton New York 11973 USA Graduate School of Science and Technology Kwansei Gakuin University Sanda Hyogo 669-1337 Japan Department of Geological Sciences The University of Texas at Austin Austin Texas 78712 USA National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan Japan Atomic Energy Agency SPring-8 Sayo Hyogo 679-5148 Japan

We report on direct measurements of the Yb valence in the heavy Fermion compound YbCuAl as a function of temperature and pressure using resonant x-ray emission spectroscopy. The increase of the Yb2+ component at T<100 K and ambient pressure, well described by the single impurity Anderson model, is found to compensate for the thermal contraction of the unit cell volume. Under pressure, the Yb valence increases continuously up to 25 GPa, albeit a marked leveling off close to the critical pressure, at P≥13 GPa. This finding is reminiscent of a recent report on YbCu2Si2 and further confirms the interplay between electronic and magnetic fluctuations near the magnetic instability point of rare-earth intermediate-valence materials.

关键词： FERMIONS X-ray emission spectroscopy VALENCE (Chemistry) ANDERSON model CELL size

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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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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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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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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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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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XAS Study of Core-Shell PtRu Nanoparticles from Galvanic Pulse Current Deposition

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ECS Meeting Abstracts 2012年第45期MA2012-02卷

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

Abstract not Available.

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Surface Modification of PtRu/C by Mono-layered Decoration of Pt, Au, Pd, and Ir for Oxygen Reduction Reaction

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ECS Meeting Abstracts 2012年第54期MA2012-02卷

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

Abstract not Available.

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