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Properties of the Ferrimagnetic Double-Perovskites A2FeReO6 (A=Ba and Ca)

Prellier, W and Smolyaninova, V and Biswas, A and Galley, C and Greene, RL and Ramesha, K and Gopalakrishnan, J (1999) Properties of the Ferrimagnetic Double-Perovskites A2FeReO6 (A=Ba and Ca). In: MRS Proceedings, 602 . p. 23.

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Abstract

We have synthesized ceramics of A2FeReO6 double-perovskites A2FeReO6 (A=Ba, Ca). Structural characterizations indicate a cubic structure with a=8.0854(1) Å for Ba2FeReO6 and a distorted monoclinic symmetry with a=5.396(1) Å, b=5.522(1) Å, c=7.688(2) Å and β=90.4° for Ca2FeReO6. The barium compound is metallic from 5K to 385K, i.e. no metal-insulator transition has been seen up to 385K, and the calcium compound is semiconducting from 5K to 385K. Magnetization measurements show a ferrimagnetic behavior for both materials, with Tc =315 K for Ba2FeReO6 and above 385K for Ca2FeReO6. At 5K we observed, only for Ba2FeReO6, a negative magnetoresistance of 10% in a magnetic field of 5T. Electrical, magnetic and thermal properties are discussed and compared to those of the analogous compounds Sr2Fe(Mo,Re)O6 recently studied.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Cambridge University Press.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 25 Aug 2011 09:25
Last Modified: 25 Aug 2011 09:25
URI: http://eprints.iisc.ernet.in/id/eprint/40311

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