Attributive Designating or relating to a cooling effect observed in certain systems, especially a mixture of liquid and solid helium-3, when they are solidified by compression, and which occurs because the entropy of the solid is greater than that of the liquid.
Described by Pomeranchuk in Žurnal. eksper. i teoret. fiziki 20 (1950) 919.
1950s; earliest use found in Chemical Abstracts. From the name of Isaak Jakovlevič Pomerančuk, Russian physicist.