Intralayer carbon substitution in the MgB2 superconductor

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

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Abstract

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
Volume64
Issue number13
Publication statusPublished - 2001 Oct 1
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Takenobu, T., Ito, T., Chi, D. H., Prassides, K., & Iwasa, Y. (2001). Intralayer carbon substitution in the MgB2 superconductor. Physical Review B - Condensed Matter and Materials Physics, 64(13), 1345131-1345133. [134513].