We introduce carbon onto boron sites in MgB₂. The resulting changes in crystal lattice constants and superconducting transition temperature Tc are characterized by x-ray-diffraction, magnetic susceptibility, and electrical resistance measurements. The consequence of approximately 10% carbon doping of boron sites is a 1% contraction of the intraplane lattice dimension (with no appreciable change in the interplane dimension) and a lowering of Tc by approximately 7 K. The relative contributions to the shift in Tc from lattice contraction and charge transfer are evaluated.
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Mickelson et al. (2002) studied this question.
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