  Stratification due to ion-ion friction in a magnetized multiple-ion species
plasma is shown to be accompanied by a heat pump effect, identified for the
first time here, transferring heat from one ion species to another as well as
from one region of space to another. The heat pump is produced via newly
identified heating mechanisms associated with charge incompressibility and the
Ettingshausen effect. Besides their academic interest, these new effects may
have useful applications to plasma technologies that involve rotation or
compression.
