Finite-size effects in thermodynamics: Negative compressibility and global instability in two-phase systems
Research output: Contribution to journal › Article › Scientific › peer-review
|Journal||Physical Review B|
|Publication status||Published - 2 Apr 2018|
|MoE publication type||A1 Journal article-refereed|
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.