Pomeranchuk effect in unstable Ytterbium systems

Details Pomeranchuk effect in unstable Ytterbium systems Pomeranchuk effect in unstable Ytterbium systems

2004-03-09

arxiv.org/abs/cond-mat/0403251v1

Physics

Condensed Matter

Strongly Correlated Electrons

3 pages, 3 figures and 1 table

Scientific paper

$YbInCu_{4}$ and its alloys present discontinuous, first order iso-structural transitions at pressure dependent temperatures $T_V(P)$, where a local moment phase coexist with a renormalized Fermi liquid phase. We show that along the coexistence line $T_V(P)$ the entropy of the large volume renormalized Fermi liquid phase is smaller than that of the higher density, local moment phase. This implies the existence of a Pomeranchuk effect in these Kondo lattice materials in analogy with $^3He$. The theoretical possibility of using these systems as cooling machines is discussed.

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