Heat capacity measurements with significantly improved resolution find the presence of a peak in a solid 4He sample in coexistence with liquid. With improved crystallinity, the peak decreases in height and moves to lower temperature. A hysteretic heat capacity signature consistent with 3He-4He phase separation, not detected in an earlier work is clearly observed.
@article{arxiv.0903.1898,
title = {Heat capacity peak in solid 4He: Effects of disorder and 3He impurities},
author = {X. Lin and A. C. Clark and Z. G. Cheng and M. H. W. Chan},
journal= {arXiv preprint arXiv:0903.1898},
year = {2009}
}