Intralayer carbon substitution in the MgB2 superconductor

T. Takenobu, T. Ito, Dam Hieu Chi, K. Prassides, Y. Iwasa

Research output: Contribution to journalArticlepeer-review

186 Citations (Scopus)


We report that the ternary MgB2-xCx compounds adopt an isostructural AlB2-type hexagonal structure in a relatively small range of nominal carbon concentration, x<0.1. The lattice parameter α decreases almost linearly with increasing carbon content x, while the c parameter remains unchanged, indicating that carbon is exclusively substituted in the boron honeycomb layer without affecting the interlayer interactions. The superconducting transition temperature Tc decreases quasilinearly as a function of the carbon concentration, with a slope steeper than that for the isoelectronic Mg1-xAlxB2.

Original languageEnglish
Article number134513
Pages (from-to)1345131-1345133
Number of pages3
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number13
Publication statusPublished - 2001 Oct 1


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