Abstract
We have measured the melting curve of in the temperature range from 10 to 400 mK with the accuracy of about . Crystals of different quality show the expected dependence in the range from 80 to 400 mK without any sign of the supersolid transition, and the coefficient is in excellent agreement with available data on the sound velocity in liquid and on the Debye temperature of solid . Below 80 mK, we have observed a small deviation from dependence, which, however, cannot be attributed to the supersolid transition, because instead of decrease the entropy of the solid rather remains constant, about .
- Received 10 July 2006
DOI:https://doi.org/10.1103/PhysRevLett.97.165302
©2006 American Physical Society