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	Electron doping in MgB2 studied by electron energy-loss spectroscopy
	Klie, R. F. ; Zheng, J. C. ; Zhu, Y. ; Zambano, A. J. ; Cooley, L. D. ; Zheng JC(郑金成)
	2006
关键词	FERMI-LEVEL MICRO-STRAIN DOPED MGB2 T-C RESOLUTION SUPERCONDUCTIVITY STEM CONTRAST STATES AL
英文摘要	The electronic structure of electron-doped polycrystalline Mg1-xAlx(B1-yCy)(2) was examined by electron energy-loss spectroscopy (EELS) in a scanning transmission electron microscope (STEM) and first-principle electronic structure calculations. We found significant changes in the boron K edge fine structure, suggesting the two bands of the B K edge, the sigma and the pi band, are being simultaneously filled as the electron doping concentration of Mg1-xAlx(B1-yCy)(2) was increased. Our density-functional theory calculations confirm the filling of the sigma band states close to the Fermi level, which is believed to cause the loss of superconductivity in highly doped MgB2, since the electron-phonon coupling of these states is thought to be responsible for the high superconducting transition temperature. Our results do not show significant differences in the electronic structure for electron doping on either the Mg or the B site, although many superconducting properties, such as T-c or H-c2 differ considerably for C- and Al-doped MgB2. This behavior cannot be satisfactorily explained by band filling alone, and effects such as interband scattering are considered.
语种	英语
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/70007]
专题	物理技术－已发表论文
推荐引用方式 GB/T 7714	Klie, R. F.,Zheng, J. C.,Zhu, Y.,et al. Electron doping in MgB2 studied by electron energy-loss spectroscopy[J],2006.
APA	Klie, R. F.,Zheng, J. C.,Zhu, Y.,Zambano, A. J.,Cooley, L. D.,&郑金成.(2006).Electron doping in MgB2 studied by electron energy-loss spectroscopy..
MLA	Klie, R. F.,et al."Electron doping in MgB2 studied by electron energy-loss spectroscopy".(2006).

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