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Tsuda, S University of Tokyo
Yokoya, T University of Tokyo
Kiss, T Institute of Physical and Chemical Research
Shimojima, T University of Tokyo
Shin, S University of Tokyo
Togashi, T Institute of Physical and Chemical Research
Watanabe, S University of Tokyo
Zhang, C Beijing Center for Crystal R&D
Chen, C T Beijing Center for Crystal R&D
Lee, S International Superconductivity Technology Center
Uchiyama, H International Superconductivity Technology Center
Tajima, S International Superconductivity Technology Center
Nakai, N Kyoto University
Machida, K Okayama University
"Sub-meV" resolution photoemission spectroscopy was used to study carbon-substitution dependence of the multiple superconducting gap of Mg(B1-xCx)(2). Two features corresponding to sigma and pi 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 sigma gap is proportional to T-c while the pi 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.
Digital Object Identifer:10.1103/PhysRevB.72.064527
Published with permission from the copyright holder. This is the institute's copy, as published in Physical Review B, August 2005, Volume 72, Issue 6, Pages 5.
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Physical Review B
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