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

S. Tsuda, Takayoshi 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

Research output: Contribution to journalArticle

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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
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number6
DOIs
Publication statusPublished - Aug 1 2005
Externally publishedYes

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Photoemission
Substitution reactions
photoelectric emission
Carbon
substitutes
Mean field theory
carbon
Photoelectron spectroscopy
Doping (additives)
Temperature
temperature dependence
spectroscopy

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Carbon-substitution dependent multiple superconducting gap of Mg B2 : A sub-meV resolution photoemission study. / Tsuda, S.; Yokoya, Takayoshi; 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.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 72, No. 6, 01.08.2005.

Research output: Contribution to journalArticle

Tsuda, S, Yokoya, T, Kiss, T, Shimojima, T, Shin, S, Togashi, T, Watanabe, S, Zhang, C, Chen, CT, 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, vol. 72, no. 6. https://doi.org/10.1103/PhysRevB.72.064527
Tsuda, S. ; Yokoya, Takayoshi ; 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. / Carbon-substitution dependent multiple superconducting gap of Mg B2 : A sub-meV resolution photoemission study. In: Physical Review B - Condensed Matter and Materials Physics. 2005 ; Vol. 72, No. 6.
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AU - Shin, S.

AU - Togashi, T.

AU - Watanabe, S.

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AU - Lee, S.

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