Electronic Property of the C-Site Doped MgCNi

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• 作者：Songnan Chu (1)
  Lei Shi (1)
  Weitai Wu (1)
  Yang Wang (1)
  Gaoyang Gou (1)
  
• 关键词：MgCNi3 ; Perovskite ; Superconductor ; Binding energy
• 刊名：Journal of Superconductivity Incorporating Novel Magnetism
• 出版年：2014
• 出版时间：January 2014
• 年：2014
• 卷：27
• 期：1
• 页码：209-213
• 全文大小：281 KB
• 作者单位：Songnan Chu (1)
  Lei Shi (1)
  Weitai Wu (1)
  Yang Wang (1)
  Gaoyang Gou (1)
  
  1. Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui, 230026, P.R. China
  
• ISSN：1557-1947

文摘

C-site doped MgCNi3 compounds, MgC1?em class="a-plus-plus">x B x Ni3 (x=0.15, 0.20) and MgC y Ni3 (y=1.00, 0.80, 0.65), have been investigated by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The binding energies of Ni 2p3/2 and C 1s for undoped MgCNi3 are 853.173?eV and 283.640?eV, respectively. Interestingly, the binding energy of Ni 2p3/2 is found to shift to a lower value with decreasing C-site occupation in MgC y Ni3 samples. The C-site doped by boron could also lead to a slight decrease of the binding energy of Ni 2p3/2. However, the C-site doping has few effects on the binding energy of C 1s. It is suggested that there is charge transfer from Ni- to C-site atom. The hybridism between Ni and C has an important effect on the superconductivity of MgCNi3.