Large Ca Isotope Effect in CaC6
D.G. Hinks, D. Rosenmann, H. Claus, M.S. Bailey, and J.D. Jorgensen
TL;DR
This study measures the calcium isotope effect in CaC6, revealing that superconductivity is mainly driven by calcium phonons, highlighting a different mechanism from MgB2.
Contribution
It provides the first measurement of the Ca isotope effect in CaC6, demonstrating the dominance of calcium phonons in its superconductivity.
Findings
Ca isotope effect coefficient is 0.50(7)
Superconductivity mainly involves calcium phonons
C phonons contribute very little to superconductivity
Abstract
We have measured the Ca isotope effect in the newly discovered superconductor CaC6. The isotope effect coefficient is 0.50(7). If one assumes that this material is a conventional electron-phonon coupled superconductor, this result shows that the superconductivity is dominated by coupling of the electrons by Ca phonon modes and that C phonons contribute very little. Thus, in contrast to MgB2, where phonons in the B layers are responsible for the superconductivity, in CaC6 the phonons are primarily modes of the intercalated Ca.
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