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

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

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Article number092505
Pages (from-to)925051-925054
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume68
Issue number9
Publication statusPublished - 2003 Sep 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Yang, H. D., Liu, H. L., Lin, J. Y., Kuo, M. X., Ho, P. L., Chen, J. M., Jung, C. U., Park, M. S., & Lee, S. I. (2003). X-ray absorption and optical spectroscopy studies of (Mg 1-xAlx)B2. Physical Review B - Condensed Matter and Materials Physics, 68(9), 925051-925054. [092505].