X-ray absorption and optical spectroscopy studies of (Mg 1-xAlx)B2

H. D. Yang*, H. L. Liu, Jiunn-Yuan Lin, M. X. Kuo, P. L. Ho, J. M. Chen, C. U. Jung, Min Seok Park, Sung Ik Lee

*此作品的通信作者

研究成果: Article同行評審

13 引文 斯高帕斯(Scopus)

摘要

X-ray absorption spectroscopy and optical reflectance measurements have been carried out to elucidate the evolution of the electronic structure in (Mg1-xAlx) B2 for x=0.0, 0.1, 0.2, 0.3, and 0.4. The important role of B 2pσ hole states to superconductivity has been identified, and the decrease in the hole carrier number is quantitatively determined. The rate of the decrease in the hole concentration agrees well with the theoretical calculations. On the other hand, while the evolution of the electronic structure is gradual through the doping range, Tc suppression is most significant at x=0.4. These results suggest that the superstructure in (Mg1-xAlx)B2, in addition to the σ holes, can affect the lattice dynamics and contributes to the T c suppression effect. Other possible explanations like the topological change of the σ band Fermi surface are also discussed.

原文English
文章編號092505
頁(從 - 到)1-4
頁數4
期刊Physical Review B - Condensed Matter and Materials Physics
68
發行號9
DOIs
出版狀態Published - 1 9月 2003

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