Abstract
We investigate the pressure-induced superfluid-solid transition of at . Neglecting the accidental instability against nucleation, we find a definite stability limit at which the superfluid phase becomes intrinsically unstable against a density fluctuation number . We find that the roton minimum with frequency is the soft mode associated with this stability limit. This interpretation reflects the observed pressure dependence both of the roton minimum and of the first maximum of the structure factor at .
- Received 23 July 1971
DOI:https://doi.org/10.1103/PhysRevLett.27.1186
©1971 American Physical Society