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

  • W. Prellier (a1) (a2), V. Smolyaninova (a1), A. Biswas (a1), C. Galley (a1), R.L. Greene (a1), K. Ramesha (a3) and J. Gopalakrishnan (a3)
  • DOI: http://dx.doi.org/10.1557/PROC-602-23
  • Published online: 01 February 2011
Abstract
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.

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