title: Heat capacity peak in solid 4He: effects of disorder and 3He impurities.
abstract: 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.
authors.affiliation: Department of Physics, The Pennsylvania State University, University Park, PA 16802, USA.
authors.forename: X
authors.initials: X
authors.lastname: Lin
authors.forename: A C
authors.initials: AC
authors.lastname: Clark
authors.forename: Z G
authors.initials: ZG
authors.lastname: Cheng
authors.forename: M H W
authors.initials: MH
authors.lastname: Chan