Abstract
Specific-heat measurements are reported for cubic (), icosahedral (), and amorphous () phases of in the temperature range 0.04-5 K. All three phases are superconducting, with K, respectively. The electronic density of states is comparable to that expected in the free-electron model for all three phases. Compared to the phase, significant lattice softening is observed in the phase and, especially, in the phase, indicating an increase in the electron-phonon coupling parameter with decreasing order.
- Received 6 February 1987
DOI:https://doi.org/10.1103/PhysRevLett.58.1945
©1987 American Physical Society