Abstract
The bcc phase of barium is a superconductor. increases steeply with pressure from 0.06 K at 37 kbar to 0.5 K at 48 kbar. A fit of McMillan's expression for suggests a already in the millikelvin range at 30 kbar. Phonon softening as inferred from the decreasing melting curve is insufficient to account for the rise of with pressure.
- Received 28 June 1977
DOI:https://doi.org/10.1103/PhysRevLett.39.1161
©1977 American Physical Society