Heat capacity peak in solid 4He: effects of disorder and 3He impurities.
2009
Heat capacity measurements with significantly improved resolution find the presence of a peak in a solid 4 He 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 3 He- 4 He phase separation, not detected in an earlier work is clearly observed.
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