Carbon isotope effect in superconducting MgCNi3
T. Klimczuk, R. J. Cava
Abstract
The effect of Carbon isotope substitution on Tc in the intermetallic perovskite superconductor MgCNi3 is reported. Four independent groups of samples were synthesized and characterized. The average Tc for the Carbon-12 samples was found to be 7.12(2) K and the average Tc for the Carbon-13 samples was found to be 6.82(2) K. The resulting carbon isotope effect coefficient is alfaC = 0.54(3). This indicates that carbon-based phonons play a critical role in the presence of superconductivity in this compound.
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