PROMOTING ACCESS TO AFRICAN RESEARCH

Journal of the Nigerian Association of Mathematical Physics

Log in or Register to get access to full text downloads.

Remember me or Register



DOWNLOAD FULL TEXT Open Access  DOWNLOAD FULL TEXT Subscription or Fee Access

Mott Transition of Cerium Compound CeCu2Si2 in the Anderson Model.

Omamoke OE Enaroseha, Benjamin E Iyorzor, John OA Idiodi

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



AJOL African Journals Online