Robustness of a local Fermi Liquid against Ferromagnetism and Phase Separation
Condensed Matter
2009-10-22 v1
Abstract
We study the properties of Fermi Liquids with the microscopic constraint of a local self-energy. In this case the forward scattering sum-rule imposes strong limitations on the Fermi-Liquid parameters, which rule out any Pomeranchek instabilities. For both attractive and repulsive interactions, ferromagnetism and phase separation are suppressed. Superconductivity is possible in an s-wave channel only. We also study the approach to the metal-insulator transition, and find a Wilson ratio approaching 2. This ratio and other properties of Sr_{1-x}La_xTiO_3 are all consistent with the local Fermi Liquid scenario.
Keywords
Cite
@article{arxiv.cond-mat/9412068,
title = {Robustness of a local Fermi Liquid against Ferromagnetism and Phase Separation},
author = {Jan R. Engelbrecht and Kevin S. Bedell},
journal= {arXiv preprint arXiv:cond-mat/9412068},
year = {2009}
}
Comments
4 pages (twocolumn format), can compile with or without epsf.sty latex style file -- Postscript files: fig1.ps and fig2.ps