Carbon isotope effect in superconducting MgCNi_3

Details Carbon isotope effect in superconducting MgCNi_3 Carbon isotope effect in superconducting MgCNi_3

2004-10-20

arxiv.org/abs/cond-mat/0410504v1

Physical Review B vol. 70 (2004), 212514

Physics

Condensed Matter

Superconductivity

To be published in Phys. Rev. B. 4 pages, 1 figure

Scientific paper

10.1103/PhysRevB.70.212514

The effect of Carbon isotope substitution on T_c in the intermetallic perovskite superconductor MgCNi_3 is reported. Four independent groups of samples were synthesized and characterized. The average T_c for the Carbon-12 samples was found to be 7.12(2) K and the average T_c for the Carbon-13 samples was found to be 6.82(2) K. The resulting carbon isotope effect coefficient is alfa_C = 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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