Electrical and magnetic properties of $La_{2-x}Sr_xNiO_4$: A tentative phase diagram

Sreedha, K and Rao, CNR (1990) Electrical and magnetic properties of $La_{2-x}Sr_xNiO_4$: A tentative phase diagram. In: Materials Research Bulletin, 25 (10). pp. 1235-1242.

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Abstract

$La_{2-x}Sr_xNiO_4$ shows a maximum in the$C/a$ ratio around $\times= 0.6$ up to which composition the concentration of holes is equal to that expected theoretically. The material becomes a degenerate semiconductor above a certain temperature up to$\times= 0.8$, but is metallic at room temperature when $\times\geq1.0.$ All the compositions with$\times \geq 0.05$ are paramagnetic in the 15 -300K range. Based on these measurements, an electronic phase diagram is tentatively proposed. It is noteworthy that the antiferromagnetic order disappears at low doping levels in both $La_{2-x}Sr_xNiO_4$ and $La_{2-x}Sr_xCuO_4$, but metallicity is seen at 300K only at a much higher x value in the former system.

Item Type: Journal Article Copyright of this article belongs to Pergamon Press plc. Division of Chemical Sciences > Solid State & Structural Chemistry Unit 06 Feb 2008 19 Sep 2010 04:41 http://eprints.iisc.ernet.in/id/eprint/12660