Covalency-driven unusual metal-insulator transition in nickelates

Barman, SR and Chainani, A and Sarma, DD (1994) Covalency-driven unusual metal-insulator transition in nickelates. In: Physical Review B, 49 (12). pp. 8475-8478.

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Abstract

Electronic structures of metallic $LaNiO_3$ and insulating $NdNiO_3$ are investigated using electron spectroscopies as well as band-structure and model-Hamiltonian calculations. It is shown that there is an increase in the transfer integral, $t_{pd}$ in $LaNiO_3$ compared to $NdNiO_3$ though $U_{dd}$ and A are very similar. A phase diagram obtained with a multiband Hubbard model explains the metal-insulator transition as well as the anomalous resistivity of $NdNiO_3$ under pressure while indicating various interesting possibilities near the metal-insulator phase line.

Item Type:	Journal Article
Publication:	Physical Review B
Publisher:	American Physical Society
Additional Information:	Copyright of this article belongs to American Physical Society.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	07 Oct 2006
Last Modified:	19 Sep 2010 04:30
URI:	http://eprints.iisc.ac.in/id/eprint/8229

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