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arXiv · 1108.0281

Reentrant behaviour in Landau Fermi liquids with spin-split Pomeranchuk instabilities

P. Rodriguez Ponte·D. C. Cabra·N. Grandi
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Abstract

We study the effects of spin-antisymmetric interactions on the stability of a Landau-Fermi liquid on the square lattice, using the generalized Pomeranchuk method for two-dimensional lattice systems. In particular, we analyze interactions that could induce instabilities of the so called spin-split type, that is when spin-up and spin-down Fermi surfaces are displaced with respect to each other. The phase space is studied as a function of the strength of the interaction $V$, the electron chemical potential $\mu$ and an external magnetic field $h$. We find that such interactions produce in general an enhancement of the instability region of the Landau-Fermi liquid. More interestingly, in certain regions of the $V$-$\mu$ phase space, we find a reentrant behaviour as a function of the magnetic field $h$, similar to that found in recent experiments, e.g. in URu$_2$Si$_2$ and Sr$_3$Ru$_2$O$_7$.

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P. Rodriguez Ponte, D. C. Cabra, N. Grandi. 2011-08-01. Reentrant behaviour in Landau Fermi liquids with spin-split Pomeranchuk instabilities. https://doi.org/10.1142/s0217984912501254

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