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``Sub-meV'' resolution photoemission spectroscopy was used to studycarbon-substitution dependence on the multiple superconducting gap of Mg(B$_{1- x}$C$_{x})_{2}$. Two features corresponding to $\sigma $ and $\pi $ gaps areclearly observed in the raw spectra up to carbon concentration x = 7.5 {%}. Theobserved x dependence of the two gaps shows a qualitatively different behavior:a marked change of the $\sigma $ gap proportional to the $T_{c}$ variation anda negligible one of the $\pi $ gap. This as well as the temperature dependencecan be explained with the two-band mean-field theory. Implications from thepresent study are discussed.Comment: 4 figures, PDF onl

physical review. b, condensed matter and materials physics

Carbon-substitution dependent multiple superconducting gap of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Mg</mml:mi><mml:msub><mml:mi mathvariant="normal">B</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>: A sub-meV resolution photoemission study

Carbon-substitution dependent multiple superconducting gap ofMgB2: A sub-meV resolution photoemission study