Heat capacity peak in solid 4He: effects of disorder and 3He impurities.
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.
Lin
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Department of Physics, The Pennsylvania State University, University Park, PA 16802, USA.
Clark
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Cheng
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Chan
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