Mott Transition of Cerium Compound CeCu2Si2 in the Anderson Model.

Abstract

The Exact-Diagonalization (ED) technique is applied to the Single Site Impurity Anderson Model (SIAM) and the Periodic Anderson Model (PAM) to elucidate the nature of the ground-state energy and the phase diagram of the two models. The results obtained show a smooth phase transition from an antiferromagnetic (Metal) phase to a ferromagnetic (Insulator) phase at slightly away from half filling in the two electrons on three site lattice system (1-D) as the value of hopping matrix element, t increases in the SIAM and PAM. Experimental observation shows that increasing the Ce content in CeCu₂Si₂ leads to a phase transition from a Metallic to an Insulating phase.

Keywords: Antiferromagnetism, Ferromagnetism, Metal, Insulator, Transition point

Journal of the Nigerian Association of Mathematical Physics, Volume 19 (November, 2011), pp 565 – 570