Phonons and superconductivity in YbC$_6$ and related compounds
M. H. Upton, T. R. Forrest, A. C. Walters, C. A. Howard, M. Ellerby,, A. H. Said, D. F. McMorrow
TL;DR
This study measures phonons in YbC6 and related compounds, revealing trends that suggest superconducting graphite intercalation compounds are best understood as electron-doped graphite, impacting the understanding of their superconductivity.
Contribution
It provides experimental phonon data and analysis that link phonon behavior to superconductivity in GICs, offering a new perspective on their electronic structure.
Findings
Phonon measurements in YbC6 show specific trends with T_c.
Superconducting GICs resemble electron-doped graphite.
Model fits reveal correlations between phonons and superconductivity.
Abstract
The out-of-plane intercalate phonons of superconducting YbC6 have been measured with inelastic x-ray scattering. Model fits to this data, and previously measured out-of-plane intercalate phonons in graphite intercalation compounds (GICs), reveal surprising trends with the superconducting transition temperature. These trends suggest that superconducting GICs should be viewed as electron-doped graphite.
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