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Electronic Property of the C-Site Doped MgCNi

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Abstract

C-site doped MgCNi3 compounds, MgC1−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.

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Acknowledgements

This project was financially supported by the National Basic Research Program of China (973 Program, Grant No. 2009CB939901), and the National Science Foundation of China, Grant No. 10874161.

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Correspondence to Lei Shi.

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Chu, S., Shi, L., Wu, W. et al. Electronic Property of the C-Site Doped MgCNi. J Supercond Nov Magn 27, 209–213 (2014). https://doi.org/10.1007/s10948-013-2242-0

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  • DOI: https://doi.org/10.1007/s10948-013-2242-0

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