LOCAL FERMI LIQUIDS - WHERE HAVE ALL THE INSTABILITIES GONE

Authors
BEDELL KS ENGELBRECHT J
Citation
Ks. Bedell et J. Engelbrecht, LOCAL FERMI LIQUIDS - WHERE HAVE ALL THE INSTABILITIES GONE, Philosophical magazine. B. Physics of condensed matter. Statistical mechanics, electronic, optical and magnetic, 74(5), 1996, pp. 633-640
Citations number
16
Categorie Soggetti
Physics, Applied",Mechanics,"Physics, Condensed Matter","Material Science
Journal title
Philosophical magazine. B. Physics of condensed matter. Statistical mechanics, electronic, optical and magnetic → ACNP
ISSN journal
13642812
Volume
74
Issue
5
Year of publication
1996
Pages
633 - 640
Database
ISI
SICI code
1364-2812(1996)74:5<633:LFL-WH>2.0.ZU;2-Z
Abstract
We present the properties of Fermi liquids with the microscopic constr aint of a local (i.e. momentum independent) self-energy. With this con straint, the forward-scattering sum rule imposes strong limitations on the Fermi-liquid parameters, which rule out any Pomeranchuk instabili ties. For both attractive and repulsive interactions, ferromagnetism a nd phase separation are suppressed. Superconductivity is possible in a n s-wave channel only. We also study the approach to the metal-insulat or transition and find a Wilson ratio approaching the value 2. This ra tio and other properties of Sr1-xLaxTiO3 are all consistent with the l ocal Fermi-liquid scenario.