Carbon-substitution dependent multiple superconducting gap of Mg B2: A sub-meV resolution photoemission study

S. Tsuda, T. Yokoya, T. Kiss, T. Shimojima, S. Shin, T. Togashi, S. Watanabe, C. Zhang, C. T. Chen, S. Lee, H. Uchiyama, S. Tajima, N. Nakai, K. Machida

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Abstract

"Sub-meV" resolution photoemission spectroscopy was used to study carbon-substitution dependence of the multiple superconducting gap of Mg (B1-x Cx) 2. Two features corresponding to σ and π gaps are clearly observed in the raw spectra up to carbon concentration x=0.075. The observed x dependence of the two gaps shows a qualitatively different behavior: the σ gap is proportional to Tc while the π gap shows negligible change. Doping as well as temperature dependence can be explained within the two-band mean-field theory. Implications from the present study are discussed.

Original languageEnglish
Article number064527
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number6
DOIs
Publication statusPublished - Aug 1 2005

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Tsuda, S., Yokoya, T., Kiss, T., Shimojima, T., Shin, S., Togashi, T., Watanabe, S., Zhang, C., Chen, C. T., Lee, S., Uchiyama, H., Tajima, S., Nakai, N., & Machida, K. (2005). Carbon-substitution dependent multiple superconducting gap of Mg B2: A sub-meV resolution photoemission study. Physical Review B - Condensed Matter and Materials Physics, 72(6), [064527]. https://doi.org/10.1103/PhysRevB.72.064527