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ALaMn(2)O(6-y) (A=K, Rb): Novel ferromagnetic manganites exhibiting negative giant magnetoresistance

Ramesha, K and Smolyaninova, VN and Gopalakrishnan, J and Greene, L (1998) ALaMn(2)O(6-y) (A=K, Rb): Novel ferromagnetic manganites exhibiting negative giant magnetoresistance. In: Chemistry of Materials, 10 (5). pp. 1436-1439.

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We report the synthesis of a new series of manganese oxides, ALaMn(2)O(6-y), for A = K, nb, and Cs, that adopt an ordered superstructure of the perovskite. The Ii and Rb phases are tetragonal (a(t) similar to 7.75, c(t) similar to 7.10 Angstrom) and the Cs phase is orthorhombic (a(0) = 5.511, b(0) = 5.468, c = 7.311 Angstrom) indicating 2a(p) x 2a(p) and root 2a(p) x root 2a(p) x 2a(p) (a(p) = perovskite subcell) superstructures, respectively. The K and Rb phases are ferromagnetic (T-c similar to 327 and 300 K) metals, exhibiting a giant magnetoresistance behavior similar to alkaline earth metal substituted lanthanide manganites. The results reveal that it is possible to induce Mn(III)I Mn(TV) mixed valency and the related electronic properties through action deficiency in ordered perovskites of the kind ALaMn(2)O(6).

Item Type: Journal Article
Publication: Chemistry of Materials
Publisher: American Chemical Society
Additional Information: Copyright of this article belongs to American Chemical Society.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 22 Apr 2009 04:02
Last Modified: 19 Sep 2010 05:00
URI: http://eprints.iisc.ac.in/id/eprint/18106

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