English  |  正體中文  |  简体中文  |  Items with full text/Total items : 52047/87178 (60%)
Visitors : 8687355      Online Users : 199
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/27775

    Title: Electronic structure of Ni-Cu alloys : the d-electron charge distribution
    Authors: Hsieh, H. H.;Chang, Y. K.;Pong, Way-faung;Pieh, J. Y.;Tseng, P. K.;Sham, T. K.;Coulthard, I.;Naftel, S. J.;Lee, J. F.;Chung, S. C.;Tsang, K. L.
    Contributors: 淡江大學物理學系
    Date: 1998-06
    Issue Date: 2013-07-09 15:22:41 (UTC+8)
    Publisher: College Park: American Physical Society
    Abstract: This work investigates charge redistribution in a series of Ni-Cu alloys using x-ray photoemission spectroscopy (XPS) and Ni/Cu L3,2- and K-edge x-ray-absorption near-edge structure (XANES). XPS results show that the constituent d bands are well separated and shifted to a slightly higher binding energy upon dilution into the other host, indicating that the atomic sites in the alloy are not as well screened relative to the pure metal. However, no significant d-band narrowing is observed, suggesting that there is modest d-d interaction in the alloys. In contrast to the XPS observation, XANES results show a reduction in white-line intensity at both edges relative to the pure metal suggesting that both Ni and Cu sites gain d charge. The unoccupied Ni d band is far from fully occupied even at infinite dilution. The discrepancy between the implications of the XPS and XANES results is dealt with using a charge redistribution model in which s-p-d rehybridization takes place at both sites within the framework of electroneutrality and electronegativity considerations. It appears that both Ni and Cu gain a small but measurable amount of d charge in alloy formation through rehybridization (loss of non-d conduction charge). Possible connection between these results and the disappearance of ferromagnetism in Ni1-xCux alloys at x>0.6 is discussed.
    Relation: Physical Review B (Condensed Matter) 57(24), pp.15204-15210
    DOI: 10.1103/PhysRevB.57.15204
    Appears in Collections:[物理學系暨研究所] 期刊論文

    Files in This Item:

    File Description SizeFormat
    PhysRevB.57.15204.pdf134KbAdobe PDF436View/Open

    All items in 機構典藏 are protected by copyright, with all rights reserved.

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - Feedback