Solid state Pomeranchuk effect
  Recently we have shown that $YbInCu_4$ and related compounds present a solid state Pomeranchuk effect. These systems have a first order volume transition where a local moment phase coexists with a renormalized Fermi liquid in analogy with $^3He$ at its melting curve. We demonstrate here experimentally that the solid state Pomeranchuk effect, controlled by a magnetic field, can be used to produce cooling. 
M. A. Continentino, A. S. Ferreira, P. G. Pagliuso, C. Rettori, J. L.   Sarrao