First order valence transition in YbInCu_4 in the (B,T) - plane

Details First order valence transition in YbInCu_4 in the (B,T) - plane First order valence transition in YbInCu_4 in the (B,T) - plane

2000-08-08

arxiv.org/abs/cond-mat/0008134v3

J. Phys. Condens. Matter 12 (2000) L1-L8

Physics

Condensed Matter

Strongly Correlated Electrons

RevTeX, 5 pages, 2 figures

Scientific paper

10.1088/0953-8984/12/47/102

The puzzling properties of the first order phase transition in YbInCu$_4$ and its alloys in the wide range of magnetic fields and temperatures are perfectly described in terms of a simple entropy transition for free Yb ions. In particular, it turns out that the transition line in the $(B,T)$-plane is very close to the elliptic shape, as it has been observed experimentally. Similar calculations are done, and the experiments are proposed for the $(\gamma{-}\alpha)$ phase transition in Ce in Megagauss fields. We speculate, that in case of YbInCu$_4$ the first order transition is a Mott transition between a higher temperature phase in which localized moments are stabilized by the entropy terms in the free energy, and a band-like non-magnetic ground state of the $f$-electrons.

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