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

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.

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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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Electronic transitions in CePd2Si2 studied by resonant x-ray emission spectroscopy at high pressures and low temperatures

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Physical Review B 2012年第23期86卷 235131-235131页

作者： Hitoshi Yamaoka Yumiko Zekko Akio Kotani Ignace Jarrige Naohito Tsujii Jung-Fu Lin Jun'ichiro Mizuki Hideki Abe Hideaki Kitazawa Nozomu Hiraoka Hirofumi Ishii Ku-Ding Tsuei Harima Institute RIKEN (The Institute of Physical and Chemical Research) Sayo Hyogo 679-5148 Japan Graduate School of Science and Technology Kwansei Gakuin University Sanda Hyogo 669-1337 Japan Photon Factory Institute of Materials Structure Science High Energy Accelerator Research Organization 1-1 Oho Tsukuba Ibaraki 305-0801 Japan National Synchrotron Light Source II Brookhaven National Laboratory Upton New York 11973 USA Quantum Beam Center National Institute for Materials Science 1-2-1 Sengen Tsukuba 305-0047 Japan Department of Geological Sciences The University of Texas at Austin Austin Texas 78712 USA National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan

Temperature and pressure dependences of the electronic structure of the heavy-fermion system CePd2Si2 have been investigated using partial fluorescence yield x-ray absorption spectroscopy and resonant x-ray emission spectroscopy at the Ce L3 edge. The temperature dependence has also been measured for CeRh2Si2 for comparison. In both compounds Ce is in a weakly mixed valence state at ambient pressure, mostly f1 with a small contribution from the f0 component. No temperature dependence of the Ce valence is observed at temperatures as low as 8 K. In CePd2Si2 at 19 K, however, the Ce valence shows a continuous increase with pressure, indicating pressure-induced delocalization of the 4f states. Theoretical calculations based on the single impurity Anderson model reproduce the experimental results well. Pressure dependence of the difference between the ground state valence and the measured valence including the final state effect is also discussed.

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Investigation of Spontaneous Pt Deposition on Carbonaceous Materials for Fuel Cell Applications

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ECS Meeting Abstracts 2011年第39期MA2011-01卷

作者： Che-Wei Kuo Yu-Chi Hsieh Pu-Wei Wu Jyh-Fu Lee Graduate Program for Science &Technology of Accelerator Light Source National Chiao Tung University Room 502 Engineering VI No.1001 Daxue Rd. Hsinchu City 300 Taiwan (R.O.C.) Hsinchu City 30010 Taiwan Department of Materials Science and Engineering National Chiao Tung University National Synchrotron Radiation Research Center

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Characteristics of highly orientated BiFeO3 thin films on a LaNiO3-coated Si substrate by RF sputtering

Characteristics of highly orientated BiFeO3 thin films on a ...

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作者： Liu, Yen-Ting Chen, San-Yuan Lee, Hsin-Yi Program for Science and Technology of Accelerator Light Source National Chiao Tung University Hsinchu 300 Taiwan Department of Materials Science and Engineering National Chiao Tung University Hsinchu 300 Taiwan National Synchrotron Radiation Research Center Hsinchu Science Park 101 Hsin-Ann Road Hsinchu 30076 Taiwan

BiFeO3 (BFO) films were grown on LaNiO3-coated Si substrate by a RF magnetron sputtering system at temperatures in the range of 300-700 °C. X-ray reflectivity and high-resolution diffraction measurements were employed to characterize the microstructure of these films. For a substrate temperature below 300 °C and at 700 °C only partially crystalline films and completely randomly polycrystalline films were grown, whereas highly (001)-orientated BFO film was obtained for a substrate temperature in the range of 400-600 °C. The crystalline quality of BFO thin films increase as the deposition temperature increase except for the film deposited at 700 °C. The fitted result from X-ray reflectivity curves show that the densities of the BFO films are slightly less than their bulk values. For the BFO films deposited at 300-600 °C, the higher the deposition temperature, the larger the remnant polarization and surface roughness of the films present. © 2010 Elsevier B.V. All rights reserved.

关键词： X ray diffraction

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Evaluation of the coupling parameters of many-body interactions in Fe(110)

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Physical Review B 2010年第19期82卷 195132-195132页

作者： X. Y. Cui K. Shimada Y. Sakisaka H. Kato M. Hoesch T. Oguchi Y. Aiura H. Namatame M. Taniguchi Graduate School of Science Hiroshima University Kagamiyama 1-3-1 Higashi-Hiroshima 739-8526 Japan Hiroshima Synchrotron Radiation Center Hiroshima University Kagamiyama 2-313 Higashi-Hiroshima 739-0046 Japan Faculty of Science and Technology Hirosaki University Hirosaki Aomori 036-8560 Japan Diamond Light Source Didcot OX11 0DE United Kingdom ADSM Hiroshima University Kagamiyama 1-3-1 Higashi-Hiroshima 739-8530 Japan National Institute of Advanced Industrial Science and Technology Tsukuba Ibaraki 305-8568 Japan

In order to clarify many-body interactions in ferromagnetic iron, we performed high-resolution angle-resolved photoemission spectroscopy (ARPES) on a Fe(110) single crystal. We quantitatively analyzed the ARPES line shapes for a majority-spin band crossing the Fermi level (EF). The observed group velocity was reduced with respect to the band-structure calculation by a factor of 1/2.7, giving a coupling parameter due to the electron-electron interaction of λee=1.7±0.1. This suggests a strong electron correlation in Fe 3d, which is consistent with recent high-resolution ARPES results. The real and imaginary parts of the self-energy have been experimentally evaluated near EF. The coupling parameter of the electron-phonon interaction was estimated to be λep=0.16±0.02, which is 1/10 of λee. The effective-mass enhancement with respect to the band mass m∗/mb∼1+λee+λep∼3 was, therefore, mainly caused by electron correlation.

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Unusual Layer-Dependent Charge Distribution, Collective Mode Coupling, and Superconductivity in Multilayer Cuprate Ba2Ca3Cu4O8F2

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Physical Review Letters 2009年第3期103卷 036403-036403页

作者： Yulin Chen Akira Iyo Wanli Yang Akihiro Ino M. Arita Steve Johnston Hiroshi Eisaki H. Namatame M. Taniguchi Thomas P. Devereaux Zahid Hussain Z.-X. Shen SIMES SLAC National Accelerator Laboratory Menlo Park California 94025 USA Geballe Laboratory for Advanced Materials Departments of Physics and Applied Physics Stanford University Stanford California 94305 USA Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA National Institute of Advanced Industrial Science and Technology Tsukuba Ibaraki 305-8568 Japan Graduate School of Science Hiroshima University Higashi-Hiroshima 739-8526 Japan Hiroshima Synchrotron Radiation Center Hiroshima University Higashi-Hiroshima 739-0046 Japan

Low energy ultrahigh momentum resolution angle resolved photoemission spectroscopy study on four-layer self-doped high Tc superconductor Ba2Ca3Cu4O8F2 (F0234) revealed fine structure in the band dispersion, identifying the unconventional association of hole and electron doping with the inner and outer CuO2 layers, respectively. For the states originating from two inequivalent CuO2 layers, different energy scales are observed in dispersion kinks associated with the collective mode coupling, with the larger energy scale found in the electron (n-) doped state which also has stronger coupling strength. Given the earlier finding that the superconducting gap is substantially larger along the n-type Fermi surface, our observations connect the mode coupling energy and strength with magnitude of the pairing gap.

关键词： Fluorine compounds

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X-Ray Diffuse Scattering Measurements of Nucleation Dynamics at Femtosecond Resolution

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Physical Review Letters 2008年第13期100卷 135502-135502页

作者： A. M. Lindenberg S. Engemann K. J. Gaffney K. Sokolowski-Tinten J. Larsson P. B. Hillyard D. A. Reis D. M. Fritz J. Arthur R. A. Akre M. J. George A. Deb P. H. Bucksbaum J. Hajdu D. A. Meyer M. Nicoul C. Blome Th. Tschentscher A. L. Cavalieri R. W. Falcone S. H. Lee R. Pahl J. Rudati P. H. Fuoss A. J. Nelson P. Krejcik D. P. Siddons P. Lorazo J. B. Hastings PULSE Center Stanford Linear Accelerator Center Menlo Park California 94025 USA Stanford University Department of Materials Science and Engineering Stanford California 94305 USA Stanford Synchrotron Radiation Laboratory/SLAC Menlo Park California 94025 USA* Institut für Experimentelle Physik Universität Duisberg-Essen D-45117 Essen Germany Department of Physics Lund Institute of Technology P.O. Box 118 S-22100 Lund Sweden Department of Chemistry Stanford University Stanford California 94305 USA FOCUS Center Department of Physics and Applied Physics Program University of Michigan Ann Arbor Michigan 48109 USA Stanford Linear Accelerator Center Menlo Park California 94025 USA Department of Cell and Molecular Biology Biomedical Centre Uppsala University SE-75124 Uppsala Sweden Stanford University Department of Chemistry Stanford California 94305 USA Deutsches Elektronen-Synchrotron DESY Notkestrasse 85 22607 Hamburg Germany Max-Planck-Institute of Quantum Optics Hans-Kopfermann-Str. 1 D-85748 Garching Germany Department of Physics University of California Berkeley California 94720 USA Length/Time Metrology Group Korea Research Institute of Standards and Science Daejeon 305-600 Republic of Korea Consortium for Advanced Radiation Sources The University of Chicago Chicago Illinois 60637 USA Advanced Photon Source Argonne National Laboratory Argonne Illinois 60439 USA Materials Science Division Argonne National Laboratory Argonne Illinois 60439 USA Physics Department Lawrence Livermore National Laboratory Livermore California 94550 USA National Synchrotron Light Source Brookhaven National Laboratory Upton New York 11973 USA Departement de Genie Physique Ecole Polytechnique de Montreal C.P. 6079 Succursale Centre-Ville Montreal (Quebec) Canada H3C 3A7

Femtosecond time-resolved small and wide angle x-ray diffuse scattering techniques are applied to investigate the ultrafast nucleation processes that occur during the ablation process in semiconducting materials. Following intense optical excitation, a transient liquid state of high compressibility characterized by large-amplitude density fluctuations is observed and the buildup of these fluctuations is measured in real time. Small-angle scattering measurements reveal snapshots of the spontaneous nucleation of nanoscale voids within a metastable liquid and support theoretical predictions of the ablation process.

关键词： Ultrashort pulses

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Carrier-Density-Dependent Lattice Stability in InSb

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Physical Review Letters 2007年第12期98卷 125501-125501页

作者： P. B. Hillyard K. J. Gaffney A. M. Lindenberg S. Engemann R. A. Akre J. Arthur C. Blome P. H. Bucksbaum A. L. Cavalieri A. Deb R. W. Falcone D. M. Fritz P. H. Fuoss J. Hajdu P. Krejcik J. Larsson S. H. Lee D. A. Meyer A. J. Nelson R. Pahl D. A. Reis J. Rudati D. P. Siddons K. Sokolowski-Tinten D. von der Linde J. B. Hastings Department of Chemistry Stanford University Stanford California 94305 USA PULSE Center Stanford Linear Accelerator Center Menlo Park California 94025 USA Stanford Synchrotron Radiation Laboratory/SLAC Menlo Park California 94025 USA Stanford Linear Accelerator Center Menlo Park California 94025 USA Deutsches Elektronen-Synchrotron DESY Notkestrasse 85 22607 Hamburg Germany FOCUS Center Department of Physics and Applied Physics Program University of Michigan Ann Arbor Michigan 48109 USA Max-Planck-Institute of Quantum Optics Hans-Kopfermann-Strasse 1 D-85748 Garching Germany Department of Physics University of California Berkeley California 94720 USA Materials Science Division Argonne National Laboratory Argonne Illinois 60439 USA Department of Cell and Molecular Biology Biomedical Centre Uppsala University SE-75124 Uppsala Sweden Department of Physics Lund Institute of Technology P.O. Box 118 S-22100 Lund Sweden Length/Time Metrology Group Korea Institute of Standards and Science Daejeon 305-600 Republic of Korea Lawrence Livermore National Laboratory Livermore California 94550 USA Consortium for Advanced Radiation Sources The University of Chicago Chicago Illinois 60637 USA Advanced Photon Source Argonne National Laboratory Argonne Illinois 60439 USA National Synchrotron Light Source Brookhaven National Laboratory Upton New York 11973 USA Institut für Experimentelle Physik Universität Duisberg-Essen D-45117 Essen Germany

The ultrafast decay of the x-ray diffraction intensity following laser excitation of an InSb crystal has been utilized to observe carrier dependent changes in the potential energy surface. For the first time, an abrupt carrier dependent onset for potential energy surface softening and the appearance of accelerated atomic disordering for a very high average carrier density have been observed. Inertial dynamics dominate the early stages of crystal disordering for a wide range of carrier densities between the onset of crystal softening and the appearance of accelerated atomic disordering.

关键词： Semiconducting indium compounds

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