On the validity region of Fermi-liquid description of 3D strongly correlated systems
2001 (English)In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, Vol. 226, 241-243 p.Article in journal (Refereed) Published
The decay of quasiparticles in systems with strongly correlated electrons (SSCE) is investigated. The difference with normal Fermi-liquid (FL) behavior is caused by kinematic interactions, The latter originate (in SSCE) from hopping and mixing interaction which in normal FL just modify bands, but do not cause a decay. Using a diagram technique we derive the lowest-order contribution giving decay and show how it varies with filling and with the position of the Fermi level with respect to the upper Hubbard's sub-band. Examples are given for a simple-cubic 3D-lattice. Due to spin dependence of the vertex functions a big effect on the lifetime of the quasi-particles due to magnetic fields is expected. A possible experimental realization is discussed. (C) 2001 Elsevier Science B.V. All rights reserved.
Place, publisher, year, edition, pages
2001. Vol. 226, 241-243 p.
Fermi liquid, quasi-particle damping, Anderson model
IdentifiersURN: urn:nbn:se:liu:diva-49169OAI: oai:DiVA.org:liu-49169DiVA: diva2:270065