Abstract
We introduce carbon onto boron sites in ${\mathrm{MgB}}_{2}.$ The resulting changes in crystal lattice constants and superconducting transition temperature ${T}_{c}$ 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 ${T}_{c}$ by approximately 7 K. The relative contributions to the shift in ${T}_{c}$ from lattice contraction and charge transfer are evaluated.
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