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 12C samples was found to be 7.12±0.02 K and the average TC for the 13C samples was found to be 6.82±0.02 K. The resulting carbon isotope effect coefficient is αC=0.540±0.03. This indicates that carbon-based phonons play a critical role in the presence of superconductivity in this compound.
|Number of pages
|Physical Review B - Condensed Matter and Materials Physics
|Published - Dec 2004
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics