標題: X-ray absorption and optical spectroscopy studies of (Mg1-xAlx)B-2
作者: Yang, HD
Liu, HL
Lin, JY
Kuo, MX
Ho, PL
Chen, JM
Jung, CU
Park, MS
Lee, SI
物理研究所
Institute of Physics
公開日期: 1-Sep-2003
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) B-2 for x=0.0, 0.1, 0.2, 0.3, and 0.4. The important role of B 2psigma 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, T-c suppression is most significant at x=0.4. These results suggest that the superstructure in (Mg1-xAlx)B-2, in addition to the sigma holes, can affect the lattice dynamics and contributes to the T-c suppression effect. Other possible explanations like the topological change of the sigma band Fermi surface are also discussed.
URI: http://dx.doi.org/10.1103/PhysRevB.68.092505
http://hdl.handle.net/11536/27540
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.68.092505
期刊: PHYSICAL REVIEW B
Volume: 68
Issue: 9
起始頁: 0
結束頁: 0
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