Pomeranchuk cooling (named after Isaak Pomeranchuk) is the phenomenon in which liquid helium-3 will cool if it is compressed isentropically when it is below 0.3 K. This occurs because helium-3 has the unusual property that its solid state can have a higher entropy than its liquid state. The effect was first observed by Yuri Anufriev in 1965. This can be used to construct a cryogenic cooler.
In 2021 an analog effect has been observed on twisted bilayer graphene and in TMDs
References
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- "Electrons in twisted graphene 'freeze' when heated". Physics World. 2021-04-21. Retrieved 2021-11-21.
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