The role of intra- and inter-site exchange correlations in the extended Falicov-Kimball model on a triangular lattice

Kumar, Sant and Yadav, Umesh K and Maitra, T and Singh, Ishwar (2016) The role of intra- and inter-site exchange correlations in the extended Falicov-Kimball model on a triangular lattice. In: SOLID STATE COMMUNICATIONS, 228 . pp. 1-5.

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Abstract

Ground state magnetic properties of the spin-dependent Falicov-Kimball model (FKM) are studied by incorporating the intrasite exchange correlation J (between itinerant d- and localized f-electrons) and intersite (superexchange) correlation J (between localized f-electrons) on a triangular lattice for two different fillings. Numerical diagonalization and Monte-Carlo techniques are used to determine the ground state magnetic properties. Transitions from antiferromagnetic to ferromagnetic and again to re-entrant antiferromagnetic phase is observed in a wide range of parameter space. The magnetic moments of d- and f-electrons are observed to depend strongly on the value off, J and also on the total number of d-electrons (N-d). (C) 2015 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	SOLID STATE COMMUNICATIONS
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	Copy right for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Keywords:	Strongly correlated electron systems; Triangular lattice; Magnetic phase transitions; Exchange interactions; Superexchange interactions
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	04 Mar 2016 07:56
Last Modified:	04 Mar 2016 07:56
URI:	http://eprints.iisc.ac.in/id/eprint/53310

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