Finite-size effects in thermodynamics: Negative compressibility and global instability in two-phase systems

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We have measured the equilibrium melting pressure of helium-4 as a function of the crystal size. Negative compressibility of a liquid with an inclusion of solid seed is predicted theoretically and verified experimentally with helium-4 crystal-superfluid system at 0.15 K. This two-phase system is shown to be stable if the crystal size is large enough, which is proven by the experiment. Crystal seeds that are too small spontaneously either melt completely or grow to a large enough size.


Original languageEnglish
Article number134101
Pages (from-to)1-4
JournalPhysical Review B
Issue number13
Publication statusPublished - 2 Apr 2018
MoE publication typeA1 Journal article-refereed

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ID: 19084949