Reviews of topical problems

Short-range order in strongly correlated Fermi systems

All-Russian Scientific Research Institute of Experimental Physics — Federal Nuclear Centre, prosp. Mira 37, Sarov, Nizhny Novgorod region, 607190, Russian Federation

The role of short-range order (SRO) in strongly correlated metallic systems is discussed. Magnetic neutron scattering experiments show that SRO is a universal property of such systems. Different theoretical approaches to the analysis of SRO are considered. Microscopic models based on infinite-dimensional lattice solutions (the Monte Carlo variational technique, the 1/D+1/D2 expansion for the Gutzwiller trial wave function, and the dynamical mean-field theory) do not correctly describe SRO in strongly correlated systems. A variational theory of SRO in Fermi systems is presented in which, in addition to Gutzwiller’s variational parameter, a set of new parameters describing nonlocal short-range correlations is used.

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Fulltext is also available at DOI: 10.1070/PU2003v046n02ABEH001284
PACS: 71.10.Fd, 71.27.+a, 71.28.+d (all)
DOI: 10.1070/PU2003v046n02ABEH001284
Citation: Kudasov Yu B "Short-range order in strongly correlated Fermi systems" Phys. Usp. 46 117–138 (2003)
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Оригинал: Кудасов Ю Б «Ближний порядок в сильно коррелированных ферми-системах» УФН 173 121–144 (2003); DOI: 10.3367/UFNr.0173.200302a.0121

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